阅读说明：本技术 一种可保持自平衡的作物生长信息传感器 (Crop growth information sensor capable of keeping self-balance ) 是由 刘乃森 张文宇 刘福霞 曹静 吉书雯 吴茜 朱星月 张伟欣 李文清 孙传亮 张美 于 2021-08-11 设计创作，主要内容包括：本发明涉及一种可保持自平衡的作物生长信息传感器,包括壳体,架设在壳体外的平衡装置；安装在壳体内的与壳体同轴的数据处理电路板,以数据处理电路板为对称面对称设置的电池,以及各重心均位于壳体的轴线上且上下依次设置的入射光检测机构、入射光信号检测电路板、反射光信号检测电路板和反射光检测机构；入射光检测机构中的接收器与入射光信号检测电路板的数据接收端口电性连接,反射光检测机构中的接收器与反射光信号检测电路板的数据接收端口电性连接,入射光信号检测电路板和反射光信号检测电路板的数据输出端口分别与数据处理电路板的数据接收端口电性连接；电池的正负极分别与数据接收处理电路板的正负极端口电性连接形成回路。(The invention relates to a crop growth information sensor capable of keeping self balance, which comprises a shell and a balancing device erected outside the shell; the device comprises a data processing circuit board which is arranged in a shell and is coaxial with the shell, batteries which are symmetrically arranged by taking the data processing circuit board as a symmetrical plane, and an incident light detection mechanism, an incident light signal detection circuit board, a reflected light signal detection circuit board and a reflected light detection mechanism which are sequentially arranged from top to bottom, wherein the centers of gravity of the incident light detection mechanism, the incident light signal detection circuit board, the reflected light signal detection circuit board and the reflected light detection mechanism are all positioned on the axis of the shell; a receiver in the incident light detection mechanism is electrically connected with a data receiving port of the incident light signal detection circuit board, a receiver in the reflected light detection mechanism is electrically connected with a data receiving port of the reflected light signal detection circuit board, and data output ports of the incident light signal detection circuit board and the reflected light signal detection circuit board are respectively electrically connected with a data receiving port of the data processing circuit board; the positive and negative electrodes of the battery are respectively electrically connected with the positive and negative electrode ports of the data receiving and processing circuit board to form a loop.)

1. A crop growth information sensor capable of maintaining self-balance is characterized in that: comprises that

A housing (1);

a balancing device mounted outside the housing (1);

a data processing circuit board (20) which is arranged in the shell (1) and is coaxial with the shell,

the battery mounting cylinder (12) is symmetrically arranged by taking the data processing circuit board (20) as a symmetrical plane;

and an incident light detection mechanism (2), an incident light signal detection circuit board (18), a reflected light signal detection circuit board (19) and a reflected light detection mechanism (3) which are all positioned on the axis of the shell (1) at the centers of gravity and are arranged in sequence from top to bottom;

a receiver in the incident light detection mechanism (2) is electrically connected with a data receiving port of the incident light signal detection circuit board (18), a receiver in the reflected light detection mechanism (3) is electrically connected with a data receiving port of the reflected light signal detection circuit board (19), and data output ports of the incident light signal detection circuit board (18) and the reflected light signal detection circuit board (19) are respectively electrically connected with a data receiving port of the data processing circuit board (20); and the positive electrode and the negative electrode of the battery (13) are respectively electrically connected with the positive electrode port and the negative electrode port of the data receiving and processing circuit board to form a loop.

2. The crop growth information sensor capable of maintaining self-balancing of claim 1, wherein: the balance device is a balance ring (17), the balance ring (17) is composed of at least two movably connected connecting rings and comprises a first connecting ring (171) on the inner layer and a second connecting ring (172) on the outer layer, and a handle (21) is fixed outside the second connecting ring (172).

3. The crop growth information sensor capable of maintaining self-balancing according to claim 2, wherein: first connecting ring (171) are the inner connecting ring, casing (1) outer wall bilateral symmetry has seted up a pair of hole (22) of erectting, first connecting ring (171) are interior to be equipped with and are used for the card to go into erect a pair of card post (23) of hole (22), card post (23) are cylindrical, the top is established to hemisphere, works as when gimbal ring (17) is installed on casing (1), the top of card post (23) with erect hole (22) bottom inconsistent.

4. The crop growth information sensor capable of maintaining self-balancing of claim 3, wherein: the outer surface of the clamping column (23) and/or the inner surface of the erection hole (22) are/is provided with friction surfaces.

5. The crop growth information sensor capable of maintaining self-balancing according to any one of claims 1 to 4, wherein: incident light detection mechanism (2) with the major structure of reflected light detection mechanism (3) is the same, including establishing respectively at two detection mechanism's end cover (7), running through surface light filter installation through-hole (4) and installing about end cover (7) one side with upper and lower open-ended light transmission hole seat (6) of light filter installation through-hole (4) coaxial setting, install light filter (5) and fix on light transmission hole seat (6) through light filter end cover (8) in light filter installation through-hole (4), install the receiver on light filter end cover (8).

6. The crop growth information sensor capable of maintaining self-balancing of claim 5, wherein: the incident light detection means (2) includes a first wavelength band incident light detection means (201) and a second wavelength band incident light detection means (202), and the reflected light detection means (3) includes a first wavelength band reflected light detection means (31) and a second wavelength band reflected light detection means (32).

7. The crop growth information sensor capable of maintaining self-balancing of claim 6, wherein: the inner wall of the optical filter mounting through hole (4) is provided with a placing step (41), when the optical filter (5) is placed on the placing step (41), the height of the optical filter (5) is higher than the upper edge of the light-transmitting hole seat (6), the optical filter (5) is fixed through an optical filter end cover (8) which can be in threaded connection, the optical filter end cover (8) is further provided with a light-transmitting hole (24) and a mounting seat (9) used for mounting the receiver, and the light-transmitting hole (24) and the mounting seat (9) are coaxially arranged with the light-transmitting hole seat (6).

8. The crop growth information sensor capable of maintaining self-balancing according to any one of claims 7, wherein: the data processing circuit board (20) is vertically installed in the shell (1), and the incident light signal detection circuit board (18) and the reflected light signal detection circuit board (19) are respectively installed at the upper end and the lower end of the data processing circuit board (20) through plugging grooves to be electrically connected with the data processing circuit board.

9. The crop growth information sensor capable of maintaining self-balancing of claim 8, wherein: the utility model discloses a data processing circuit board, including data processing circuit board (20) both sides respectively the symmetry be provided with vertical battery installation section of thick bamboo (12), battery (13) are installed in battery installation section of thick bamboo (12), the top of battery installation section of thick bamboo (12) is positive terminal (131), and the bottom is negative pole end (132), positive terminal (131) with the positive port electric connection of power of data processing circuit board (20), negative pole end (132) draw forth piece (16) through the metal with the power negative port electric connection of data processing circuit board (20).

10. The crop growth information sensor capable of maintaining self-balancing of claim 9, wherein: the battery installing barrel is characterized in that a battery cover plate (14) is further arranged at the bottom end of the battery installing barrel (12), a metal pressing sheet (15) is fixed on the battery cover plate (14), and when the battery cover plate (14) is buckled at the bottom end of the battery installing barrel (12), the metal pressing sheet (15) is effectively contacted with a metal leading-out sheet (16).

Technical Field

The invention relates to the field of optical sensor monitoring, in particular to a crop growth information sensor capable of keeping self balance.

Background

The real-time lossless acquisition of the crop growth information can provide data support for accurate regulation and control of crop growth, and is the basis of intelligent agriculture. The crop growth information sensors which are popularized and applied in production at present mainly focus on field crops such as rice, wheat and the like, but most of vegetable crops and oil crops urgently need growth information sensors which can be applied in production. The sensor obtains the spectral reflectivity of crops by receiving the sunlight and the intensity of reflected light of a crop canopy, the growth information of the crops can be calculated according to the reflectivity, the upper surface of the sensor receiving the sunlight is required to be in a horizontal state in the using process so as to ensure the accuracy of data acquisition, the sensor is provided with a level ruler, a user adjusts the horizontal state of the sensor before acquiring the data, the efficiency of manually adjusting the horizontal state is extremely low, the required time is usually from several minutes to more than ten minutes, and the sensor is held by the hand when acquiring the data, so that the upper surface of the sensor is difficult to be ensured to be in the horizontal state all the time, and the accuracy of data acquisition of the sensor is influenced. We have devised the present invention for this purpose.

Disclosure of Invention

According to the invention, the balance device is erected outside the sensor shell, so that the effect of automatically keeping balance of the sensor is achieved, meanwhile, the detection mechanisms arranged at the upper end and the lower end of the sensor can quickly obtain the reflectivity of the information of the ground object to be detected according to the energy data ratio of the reflected light signal of the ground object to the incident light signal of the sun, and the working efficiency is very high.

In order to achieve the purpose, the invention adopts the following technical scheme:

a crop growth information sensor capable of maintaining self-balance comprises

A housing;

a balancing device mounted outside the housing;

the data processing circuit board is arranged in the shell and is coaxial with the shell;

the battery installation cylinders are symmetrically arranged by taking the data processing circuit board as a symmetrical plane;

the center of gravity of the incident light detection mechanism is positioned on the axis of the shell, and the incident light detection mechanism, the incident light signal detection circuit board, the reflected light signal detection circuit board and the reflected light detection mechanism are arranged in sequence from top to bottom;

a receiver in the incident light detection mechanism is electrically connected with a data receiving port of the incident light signal detection circuit board, a receiver in the reflected light detection mechanism is electrically connected with a data receiving port of the reflected light signal detection circuit board, and data output ports of the incident light signal detection circuit board and the reflected light signal detection circuit board are respectively electrically connected with a data receiving port of the data processing circuit board; and the positive electrode and the negative electrode of the battery are respectively electrically connected with the positive electrode port and the negative electrode port of the data receiving and processing circuit board to form a loop.

When the sensor is obtaining the data of light signal, under handheld or clamping state, the surface at upper and lower both ends can't keep the horizontality all the time usually, uses balancing unit can reduce measuring error, consequently through arranging the battery symmetry in the both sides of data processing circuit board for data processing circuit board both sides quality is the same basically, can effectively help the sensor to keep balance. The upper end and the lower end of the sensor are respectively provided with an incident light detection mechanism and a reflected light detection mechanism, the central axis of the sensor is in a vertical state when the optical signal of the ground object information is measured, the incident light detection mechanism horizontally upwards receives the optical signal of the sun, the reflected light detection mechanism horizontally downwards receives the optical signal reflected by the ground object, the two optical signals are respectively converted and transmitted to the data processing circuit board through the incident light signal detection circuit board and the reflected light signal detection circuit board, and the ratio of the energy data of the reflected light signal of the ground object to the energy data of the incident light signal of the sun is the reflectivity of the ground object to be measured. When the device is used, the sensor can automatically keep a vertical state only by holding the balancing device by hand, optical signal data in the good state can be obtained, the reflectivity of ground object information can be conveniently and rapidly obtained, and the working efficiency of measurement is very high.

In a further improvement of the present invention, the balancing device is a balancing ring, the balancing ring is composed of at least two movably connected connecting rings, and includes an inner layer of a first connecting ring and an outer layer of a second connecting ring, and a handle is fixed outside the second connecting ring.

The invention has the further improvement scheme that the first connecting ring is an inner connecting ring, a pair of erection holes are symmetrically formed in two sides of the outer wall of the shell, clamping columns used for being clamped in the erection holes are arranged on the inner periphery of the first connecting ring, the clamping columns are cylindrical, the tops of the clamping columns are hemispherical, and when the balance ring is installed on the shell, the tops of the clamping columns are abutted against the bottoms of the erection holes.

In a further development of the invention, friction surfaces are provided on the outer surface of the clamping columns and/or on the inner surface of the mounting holes.

The invention has the further improvement scheme that the incident light detection mechanism and the reflected light detection mechanism have the same main structure and comprise end covers respectively arranged on the two detection mechanisms, optical filter mounting through holes penetrating through the upper and lower surfaces of the end covers and light-transmitting hole seats with upper and lower openings coaxially arranged with the optical filter mounting through holes and arranged on one surface of the end covers, optical filters are arranged in the optical filter mounting through holes and fixed on the light-transmitting hole seats through the optical filter end covers, and receivers are arranged on the optical filter end covers.

In a further improvement of the present invention, the incident light detecting means includes a first band incident light detecting means and a second band incident light detecting means, and the reflected light detecting means includes a first band reflected light detecting means and a second band reflected light detecting means.

The invention has the further improvement scheme that the inner wall of the optical filter mounting through hole is provided with a placing step, when the optical filter is placed on the placing step, the height of the optical filter is higher than the upper edge of the light-transmitting hole seat, the optical filter is fixed through an optical filter end cover which can be in spiral connection, the optical filter end cover is also provided with a light-transmitting hole and a mounting hole for mounting the receiver, and the light-transmitting hole and the mounting seat are coaxially arranged with the light-transmitting hole seat.

The invention has the further improvement scheme that the data processing circuit board is vertically arranged in the shell, and the incident light signal detection circuit board and the reflected light signal detection circuit board are respectively arranged at the upper end and the lower end of the data processing circuit board through plugging grooves to form electrical connection with the data processing circuit board.

According to a further improvement scheme of the invention, vertical battery installation cylinders are symmetrically arranged on two sides of the data processing circuit board respectively, the batteries are installed in the battery installation cylinders, the top end of each battery installation cylinder is a positive end, the bottom end of each battery installation cylinder is a negative end, the positive end is electrically connected with a positive power port of the data processing circuit board, and the negative end is electrically connected with a negative power port of the data processing circuit board through a metal lead-out piece.

The invention has the further improvement scheme that a battery cover plate is further arranged at the bottom end of the battery installation cylinder, a metal pressing sheet is fixed on the battery cover plate, and when the battery cover plate is buckled at the bottom end of the battery installation cylinder, the metal pressing sheet is effectively contacted with the metal leading-out sheet.

The invention has the following beneficial effects:

(1) when the sensor acquires the data of the optical signal, the surfaces of the upper end and the lower end can not always keep a horizontal state under a handheld or clamping state, and the measuring error can be reduced by using the balancing device. The upper end and the lower end of the sensor are respectively provided with an incident light detection mechanism and a reflected light detection mechanism, the central axis of the sensor is in a vertical state when the optical signal of the ground object information is measured, the incident light detection mechanism horizontally upwards receives the optical signal of the solar ray, the reflected light detection mechanism horizontally downwards receives the optical signal reflected by the ground object, the two optical signals are respectively converted and transmitted to the data processing circuit board through the incident light signal detection circuit board and the reflected light signal detection circuit board, and the ratio of the energy data of the reflected light signal of the ground object to the energy data of the incident light signal of the sun is the reflectivity of the ground object to be measured. When the device is used, the sensor can be automatically kept vertical only by holding the handle of the balance ring, so that the surfaces of the upper end and the lower end of the sensor, which receive sunlight and crop reflected light, are automatically in a horizontal state, optical signal data in the good state are obtained, the ground object information reflectivity can be conveniently and rapidly obtained, the measurement accuracy is ensured, and the measurement efficiency is improved.

(2) The balance rings are simple and easy to obtain, at least two connecting rings are arranged, the number of the connecting rings can be continuously increased in the same structural mode outside the second connecting ring, the automatic balance effect of the sensor can be achieved only by holding the sensor by hands, and the operation is very simple and convenient.

(3) The card post is established to cylindrical and top and is established to the semicircle, can guarantee when the sensor sinks at self gravity that the card post is less with the contact surface of erectting the hole for calibration sensitivity when the gimbal erects on the sensor casing, the top of card post is contradicted each other with the hole of erectting and is pushing up promptly and erectting downthehole wall, effectively prevents again not getting into stable state because of the long-time swing that too sensitive arouses.

(4) The friction surfaces are arranged on the inner surface of the clamping column or the outer surface of the erection hole or both the inner surface and the outer surface of the erection hole, so that the contact friction between the clamping column and the erection hole is increased, and the phenomenon that the clamping column swings for a long time and does not enter a stable state due to too high sensitivity is further reduced.

(5) The incident light detection mechanism and the reflected light detection mechanism at the two ends of the sensor have the same main structure, the measurement mode is kept at the same standard, the measurement error can be reduced, and the data accuracy is improved.

(6) Two sets of detection mechanisms are arranged according to actual requirements, and different wave bands are selected among the detection mechanisms according to crop information so as to meet the requirements of research and use.

(7) For better pressfitting, the height when the light filter is shelved is higher than the printing opacity hole seat, can make the fixed effect of light filter better, and the mounting means of screwed connection is convenient for dismouting light filter, easy to assemble and maintenance to repeatedly usable light filter.

(8) The incident light signal detection circuit board and the reflected light signal detection circuit board are respectively connected with the data processing circuit board through the plugging grooves, so that the transmission connection on signals can be carried out, the convenient mechanical connection is realized, the structure is simple, and the effect is better.

(9) The negative electrode end is electrically connected to the data processing circuit board through a metal lead-out sheet and forms a loop for supplying power to the data processing circuit board in cooperation with the positive electrode end; wherein the battery positive terminal is protruding, and the negative pole end then is the plane, sets up the metal preforming and the metal of negative pole end on through the battery apron and draws forth the piece at the bottom and carry out effective contact, compares in setting up the positive terminal here, and its effective area of contact is bigger, and contact effect is good, and the power supply effect is more stable.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention

FIG. 2 is a schematic cross-sectional view of the locking post and the mounting hole of the balance ring of the present invention

FIG. 3 is a schematic view of the structure inside the housing of the present invention

FIG. 4 is a schematic view of the structure of the reflected light detecting mechanism of the present invention in cooperation with the battery mounting tube

FIG. 5 is a schematic cross-sectional view of the present invention

FIG. 6 is a side cross-sectional view of the state of FIG. 4

FIG. 7 is a schematic view showing an internal structure of a battery mounting can

FIG. 8 is a schematic diagram of the installation of the end cap of the optical filter in embodiment 2 of the present invention

FIG. 9 is a cross-sectional view of an optical filter end cap, an optical filter and an end cap after being mounted according to embodiment 2 of the present invention

In the figure: 1-a shell; 2-incident light detection mechanism: 201-a first band incident light detection mechanism, 202-a second band incident light detection mechanism; 3-reflected light detection mechanism: 31-a first waveband incident light detection mechanism and 32-a second waveband incident light detection mechanism; 4-installing a through hole on the optical filter; 41-resting steps; 5-an optical filter; 6-a light-transmitting hole seat; 7-end cap; 8-an optical filter end cap; 9-a mounting seat; 10-a first sealing ring; 11-a second sealing ring; 12-a battery mounting cartridge; 13-battery: 131-positive terminal, 132-negative terminal; 14-a battery cover plate; 15-metal tabletting; 16-metal lead-out sheet; 17-balance ring: 171-a first connection ring, 172-a second connection ring; 18-an incident optical signal detection circuit board; 19-reflected light signal detection circuit board; 20-a data processing circuit board; 21-a handle; 22-erecting holes; 23-a clamp column; 24-a light-transmitting hole; 25-light filter entrance hole.

Detailed Description

The present invention is further illustrated by the following detailed description in conjunction with the accompanying drawings, it being understood that the following detailed description is illustrative of the invention only and is not intended to limit the scope of the invention, which is to be given the full breadth of the appended claims and any and all equivalent modifications thereof which will occur to those skilled in the art upon reading the present specification.

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

Example 1:

a crop growth information sensor capable of keeping self balance comprises a shell 1, a balance ring 17 erected outside the shell 1, a data processing circuit board 20 arranged in the shell 1 coaxially with the shell, battery installation cylinders 12 symmetrically arranged by taking the data processing circuit board 20 as a symmetry plane, and an incident light detection mechanism 2, an incident light signal detection circuit board 18, a reflected light signal detection circuit board 19 and a reflected light detection mechanism 3, wherein the centers of gravity of the incident light detection mechanism 2, the incident light signal detection circuit board 18, the reflected light signal detection circuit board 19 and the reflected light detection mechanism 3 are all located on the axis of the shell 1 and are arranged in sequence from top to bottom; the receiver in the incident light detection mechanism 2 is electrically connected with the data receiving port of the incident light signal detection circuit board 18, the receiver in the reflected light detection mechanism 3 is electrically connected with the data receiving port of the reflected light signal detection circuit board 19, and the data output ports of the incident light signal detection circuit board 18 and the reflected light signal detection circuit board 19 are respectively electrically connected with the data receiving port of the data processing circuit board 20; the positive and negative electrodes of the battery 13 are electrically connected with the positive and negative electrode ports of the data receiving and processing circuit board respectively to form a loop.

In the scheme, the two sides of the data processing circuit board 20 are symmetrically provided with the vertical battery installation cylinders 12 respectively, in the scheme, the balance device is erected outside the sensor shell 1, so that the two battery installation cylinders 12 are arranged and correspondingly arranged on the two sides of the data processing circuit board 20, it should be understood that the core idea in the scheme is to keep the two sides of the data processing circuit board 20 balanced, and the mass of the battery 13 is the maximum, so that the shapes or corners of the battery installation cylinders 12 on the other sides are not completely the same, but the numerical value of the difference of the left and right masses of the battery installation cylinders is negligible relative to the battery 13, so that the design requirements are met. In addition, the rest structures can be symmetrically arranged by taking the data processing circuit board 20 as a symmetrical plane on the basis of the principle so as to reduce the interference to the automatic balance.

In this scheme, balancing unit is the stabilizer ring 17, and the stabilizer ring 17 comprises two at least swing joint's go-between, including the first go-between 171 of inlayer and outer second go-between 172, and wherein first go-between 171 is the inner link, has seted up on the casing 1 and has erect hole 22, and first go-between 171 is interior to be equipped with and is used for the card to go into erect hole 22's card post 23, and card post 23 is cylindrical, the top is established to hemispherical, when the stabilizer ring 17 is installed on casing 1 the top of card post 23 with erect hole 22 bottom inconsistent. In addition, friction surfaces are arranged on the outer surface of the clamping column 23 or the inner surface of the erection hole 22 or on the outer surface of the clamping column 23 and the inner surface of the erection hole 22, so that the contact friction between the clamping column and the erection hole is increased, and the problem that the sensor cannot enter a stable state due to long-time swinging caused by over sensitivity is further reduced. The handle 21 is externally fixed to the second connection ring 172. In the using process, the handle 21 is held, and even if the angle of the second connecting ring 172 is inclined, the sensor can automatically return to the vertical state under the action of gravity under the condition that the angle is properly deviated.

In this embodiment, the rear end of the handle 21 can be designed as a screw thread to facilitate the use of the screw thread connection on the device according to the application requirement.

It should be noted that the balancing device requires at least two coupling rings, i.e., the first coupling ring 171 and the second coupling ring 172, but the number of coupling rings may still be increased, i.e., the third coupling ring, the fourth coupling ring … …, the nth coupling ring, etc.

In this scheme, incident light detection mechanism 2 is the same with the major structure of reflected light detection mechanism 3, including establishing respectively at two detection mechanism's end cover 7, running through the through-hole 4 of end cover 7 upper and lower surface and installing the upper and lower open-ended printing opacity hole seat 6 of the coaxial setting of end cover 7 one side and filter installation through-hole 4, installation light filter 5 just passes through light filter end cover 8 to be fixed on printing opacity hole seat 6 in through-hole 4, installs the receiver on the light filter end cover 8. The incident light detection mechanism 2 comprises a first waveband incident light detection mechanism 201 and a second waveband incident light detection mechanism 202, the reflected light detection mechanism 3 comprises a first waveband reflected light detection mechanism 31 and a second waveband reflected light detection mechanism 32, wherein the first waveband and the second waveband are determined by the waveband range of the optical filter 5.

The data processing circuit board 20 is vertically installed in the casing 1 and is coaxial with the casing 1, and the incident light signal detection circuit board 18 and the reflected light signal detection circuit board 19 are respectively installed at the upper end and the lower end of the data processing circuit board 20 through a plugging slot to form electrical connection with the same.

The battery 13 is installed in the battery installation cylinder 12, the top end of the battery installation cylinder 12 is a positive end 131, the bottom end is a negative end 132, the positive end 131 is electrically connected with a power supply positive end port of the data processing circuit board 20, the battery installation cylinder 12 is further provided with an axial through hole for penetrating the metal lead-out piece 16, one end of the metal lead-out piece 16 is led out from the upper end of the through hole to be electrically connected to a power supply negative end port of the data processing circuit board 20, the other end of the metal lead-out piece is led out from the lower end of the through hole to be effectively contacted with the negative electrode of the battery 13, the bottom end of the battery installation cylinder 12 is further provided with a battery cover plate 14, a metal pressing piece 15 is fixed on the battery cover plate 14, and when the battery cover plate 14 is buckled at the bottom end of the battery installation cylinder 12, the metal pressing piece 15 is effectively contacted with the metal lead-out piece 16 and the negative electrode of the battery 13.

The incident light detection mechanism 2 and the reflected light detection mechanism 3 are respectively positioned at two ends of the shell 1, the optical filter installation through hole 4 penetrates through the detection mechanism end cover 7, the optical filter 5 purchased in the market is provided with a thickness h1, so the optical filter installation through hole 4 is also provided with a depth, the inner wall of the optical filter installation through hole 4 is provided with a shelving step 41, when the optical filter 5 is shelved on the shelving step 41, the height of the optical filter 5 is higher than the upper edge of the light transmission hole seat 6, the optical filter end cover 8 is also provided with an installation seat 9 and a light transmission hole 24 for installing a receiver, the installation seat 9 and the light transmission hole 24 are coaxially arranged with the light transmission hole seat 6, the periphery of the light transmission hole seat 6 is carved with external threads, the external threads are matched with the internal threads of the optical filter end cover 8, and the optical filter 5 can be rotatably connected to the light transmission hole seat 6 through the optical filter end cover 8 to be fixed when being installed in the optical filter installation through hole 4.

In the scheme, the inner diameter of the light-transmitting hole seat 6 is the same as that of the light filter mounting through hole 4, the light filter 5 is obtained in a commercially available mode, different field angles theta can be formed by setting different radiuses r of the light-transmitting holes 24 and depths h of the light-transmitting holes 24, and in order to be suitable for obtaining plant growth information, the range of the field angles theta in the reflected light detection mechanism is 25-30 degrees, namely the range of the ratio of r to h is set to be tan12.5 degrees to tan15 degrees. The gap between the resting steps 41 on the two sides is the light filter light inlet hole 25, the radius of the light filter light inlet hole 25 is R, R needs to satisfy R/(h1+ h) is more than or equal to R/h, wherein h1 is the thickness of the light filter. The depth h of the light transmission hole 24 of the incident light detection mechanism is 0.

Example 2:

in this embodiment 2, based on the above embodiment 1, the sealing relationship between the filter end cap 8 and the filter 5 is further improved, and a first sealing ring 10 is tightly sleeved on the periphery of the light-transmitting hole seat 6, and when the filter end cap 8 is screwed onto the light-transmitting hole seat 6, the first sealing ring 10 can be in interference fit with the first sealing ring. In addition, when the optical filter 5 is placed on the placing step, the height of the optical filter 5 is higher than the upper edge of the light-transmitting hole seat 6, the second sealing ring 11 is placed on the optical filter 5, and when the optical filter end cover 8 rotates to be in contact with the first sealing ring 10, the second sealing ring 11 and the optical filter 5 are pressed by the optical filter end cover so that the optical filter 5 is fixed.

The rest is the same as the above embodiments, and is not described herein.

The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.