阅读说明：本技术 一种油烟浓度检测装置及该装置的检测方法 (A kind of detection method of oil smoke concentration detection apparatus and the device ) 是由 刘元卉 于 2019-07-29 设计创作，主要内容包括：本发明公开了一种油烟浓度检测装置,包括激光发射器,其特征在于：还包括毛玻璃和光学衍射元件,在激光发射的路径上,所述毛玻璃和光学衍射元件依次设置在激光发射器的下游,所述油烟浓度检测装置还包括用于拍摄激光发射器发射出的激光经过毛玻璃和光学衍射元件后形成的散斑图像的CCD相机。还公开了一种如上所述的油烟浓度检测装置的检测方法,以及一种应用有上所述的油烟浓度检测装置的吸油烟机。通过CCD相机拍摄激光散斑图像,可进行一个区域内的油烟浓度检测,得到油烟在空间内的浓度分布,检测可靠性高。(The invention discloses a kind of oil smoke concentration detection apparatus, including laser emitter, it is characterized by also including frosted glass and diffractive-optical element, on the path of Laser emission, the frosted glass and diffractive-optical element are successively set on the downstream of laser emitter, and the oil smoke concentration detection apparatus further includes the CCD camera for shooting the speckle image that the laser that laser transmitter projects go out is formed after frosted glass and diffractive-optical element.The detection method and a kind of application for also disclosing a kind of oil smoke concentration detection apparatus as described above have the range hood of the upper oil smoke concentration detection apparatus.Laser speckle image is shot by CCD camera, the oil smoke concentration detection in a region can be carried out, concentration distribution of the oil smoke in space is obtained, detect high reliablity.)

1. a kind of oil smoke concentration detection apparatus, including laser emitter (21), it is characterised in that: further include frosted glass (22) and light It learns diffraction element (23), on the path of Laser emission, the frosted glass (22) and diffractive-optical element (23) are successively set on The downstream of laser emitter (21), the oil smoke concentration detection apparatus further include launching for shooting laser emitter (21) The CCD camera (24) for the speckle image that laser is formed after frosted glass (22) and diffractive-optical element (23).

2. oil smoke concentration detection apparatus according to claim 1, it is characterised in that: further include for handling CCD camera (24) processor (25) of the image shot.

3. a kind of detection method of oil smoke concentration detection apparatus as claimed in claim 1 or 2, it is characterised in that: including as follows Step:

1) reference planes (P0) is chosen, obtains the reference picture (Q1) in the reference planes (P0): the laser emitter (21) Be arranged in same datum plane (P1) with CCD camera (24), the reference planes (P0) it is parallel with datum plane (P1) and away from From for H；By speckle of the CCD camera (24) shooting, laser emitter (21) the sending laser on reference planes (P0) Image is as reference picture (Q1)；

2) oil smoke starts to generate, and at interval of certain time t, the CCD camera (24) shoots laser speckle in a detection zone Realtime graphic (Q2)；

3) one coordinate system is set in the same relative position of realtime graphic (Q2) and reference picture (Q1), at realtime graphic (Q2) The upper match block (Q4) for choosing m*m pixel, m are the quantity of pixel, and the center of the match block (Q4) is match point (A2)；It is scanned for, is found with the match block (Q4) most within the scope of reference picture (Q1) respective coordinates with the match block (Q4) The center of matched an equal amount of block of pixels (Q3), the block of pixels (Q3) has and the most matched pixel of match point (A2) Point (A1), according to the most matched pixel (A1) in reference picture (Q1) coordinate position, with realtime graphic (Q2) in The difference of coordinate position with point (A2) calculates the transversal displacement n of realtime graphic (Q2)；

4) the transversal displacement n for obtaining step 3) substitutes into formula: in Dis=L*H*f/ (H*p*n+L*f), wherein Dis is Spatial depth with point (A2), L are the distance between the laser emitter (21) and CCD camera (24), and f is CCD camera (24) focal length, p are pixel compartments width, obtain the spatial depth of match point (A2) in realtime graphic (Q2), and depth is smaller, indicate oil Smoke is bigger.

4. detection method according to claim 3, it is characterised in that: in step 3), select the match block of different coordinates (Q4), the depth of match point different in detection zone (A2) is thus obtained, to obtain in the detection zone oil smoke in space Interior concentration distribution.

5. a kind of application has the range hood of oil smoke concentration detection apparatus as claimed in claim 1 or 2, including fume-exhausting owner Body (1), oil smoke concentration detection apparatus (2) setting is on front side of range hood main body (1), it is characterised in that: the fume-exhausting Owner's body (1) includes the blower (12) of the oil smoke concentration control revolving speed detected by oil smoke concentration detection apparatus (2).

6. range hood according to claim 5, it is characterised in that: the range hood main body (1) includes shell (11) With the panel (13) being arranged on front side of shell (11), the oil smoke concentration detection apparatus (2) is arranged on panel (13), the wind Machine (12) setting is in shell (11).

7. range hood according to claim 6, it is characterised in that: there are two oil smoke concentration detection apparatus (2) tools, Left and right arranged for interval, the blower (12) also have there are two, left and right compartment of terrain is arranged in parallel.

Technical field

The present invention relates to sensing technology, especially a kind of oil smoke concentration detection apparatus, the detection method of the device, Yi Jiying With the range hood for having the detection device.

Background technique

It is typically all to be realized by way of manual switching gear that the air quantity of existing range hood, which is adjusted,.However it is cooking In the process, when oil smoke is more, user may forget or both hands inconvenience switches the gear of supreme air quantity, lead to range hood Air quantity is inadequate, and a large amount of oil smoke are leaked from the left and right sides of range hood to be run, and causes smoke absorption effect bad.

For this purpose, also there has been some methods for automatically controlling blower fan system revolving speed by detection oil smoke concentration.Common one Kind oil smoke concentration detection apparatus, i.e., by the way of laser detection.Such as application No. is the Chinese patent of 201810306630.X public affairs A kind of laser light scattering cooking fume instrument opened, including fuselage, fuselage interior are provided with laser light source, spectroscope, the first light-receiving Device, the second optical receiver, output processor；Laser light source is for emitting laser beam；Spectroscope is for laser beam to be divided into Detect light beam and correction light beam；Fuselage is open at one end, and when monitor works, detection light beam is projected from opening；First optical receiver Light is scattered for receiving, and scattering light is converted into the first electric signal, scattering light is by the oil in detection light beam irradiation smoke discharging pipe Cigarette and formed；Second optical receiver is converted into the second electric signal for receiving correction light beam, and by correction light beam；Output processing Device, for calculating the oil smoke concentration in smoke discharging pipe according to first electric signal and the second electric signal.This detection device, Single-point detection can only be carried out, reliability is not high, therefore need to be further improved.

Summary of the invention

First technical problem to be solved by this invention is in view of the deficiency of the prior art, to provide a kind of oil Smoke density detection device can improve the reliability of detection.

Second technical problem to be solved by this invention is to provide a kind of detection side of above-mentioned oil smoke concentration detection apparatus Method.

Third technical problem to be solved by this invention, which is to provide a kind of application, above-mentioned oil smoke concentration detection apparatus Range hood.

The present invention solves technical solution used by above-mentioned first technical problem are as follows: a kind of oil smoke concentration detection apparatus, Including laser emitter, it is characterised in that: it further include frosted glass and diffractive-optical element, it is described on the path of Laser emission Frosted glass and diffractive-optical element are successively set on the downstream of laser emitter, and the oil smoke concentration detection apparatus further includes being used for The CCD camera for the speckle image that the laser that shooting laser transmitter projects go out is formed after frosted glass and diffractive-optical element.

Further, further include for handle CCD camera shooting image processor.

The present invention solves technical solution used by above-mentioned second technical problem are as follows: a kind of oil smoke concentration as described above The detection method of detection device, characterized by the following steps:

1) reference planes are chosen, the reference picture in the reference planes is obtained: the laser emitter and CCD camera arrangement In same datum plane, the reference planes are parallel with datum plane and distance is H；It is that the CCD camera is shot, sharp The speckle image of the laser that optical transmitting set issues on the reference plane is as reference picture；

2) oil smoke starts to generate, and at interval of certain time t, the CCD camera shoots laser speckle in a detection zone Realtime graphic；

3) one coordinate system is set in the same relative position of realtime graphic and reference picture, m* is chosen on realtime graphic The match block of m pixel, m are the quantity of pixel, and the center of the match block is match point；With the match block with reference to figure As being scanned within the scope of respective coordinates, find with the most matched an equal amount of block of pixels of the match block, in the block of pixels Heart position have with the most matched pixel of match point, according to most matched pixel coordinate position in a reference image, With the difference of the coordinate position of match point in realtime graphic, the transversal displacement n of realtime graphic is calculated；

4) the transversal displacement n obtained step 3) substitutes into formula: in Dis=L*H*f/ (H*p*n+L*f), wherein Dis For the spatial depth of match point, L is the distance between the laser emitter and CCD camera, and f is CCD camera focal length, and p is picture Plain lattice width, obtains the spatial depth of match point in realtime graphic, and depth is smaller, indicates that oil smoke amount is bigger.

The match block of different coordinates is selected, detection zone is thus obtained in step 3) to improve the reliability of testing result The depth of different match points in domain, to obtain concentration distribution of the oil smoke in space in the detection zone.

The present invention solves technical solution used by above-mentioned third technical problem are as follows: a kind of application have it is upper described in oil smoke The range hood of concentration detection apparatus, including range hood main body, the oil smoke concentration detection apparatus are arranged in fume-exhausting owner On front side of body, it is characterised in that: the range hood main body includes the oil smoke concentration control detected by oil smoke concentration detection apparatus The blower of revolving speed.

Preferably, the range hood main body includes shell and the panel that is arranged on front side of shell, the oil smoke concentration inspection It surveys device to be arranged on panel, the blower is arranged in shell.

Preferably, to be adapted to common eyes stove, there are two the oil smoke concentration detection apparatus tools, left and right arranged for interval, The blower also have there are two, left and right compartment of terrain is arranged in parallel.

Compared with the prior art, the advantages of the present invention are as follows: laser speckle image is shot by CCD camera, one can be carried out Oil smoke concentration detection in a region, obtains concentration distribution of the oil smoke in space, detects high reliablity；Detection device is installed on Outside flue, it is more easy to clean and prevent greasy dirt accumulation (user only needs cleaning glass window panels outside) is interfered to result；It is left It is right to detect respectively, power distribution is carried out according to oil smoke concentration, keeps comprehensive smoke absorption effect best.

Detailed description of the invention

Fig. 1 is the application state schematic diagram of the range hood of the embodiment of the present invention；

Fig. 2 is the application state side view of the range hood of the embodiment of the present invention；

Fig. 3 is the oil smoke concentration detection apparatus schematic diagram of the range hood of the embodiment of the present invention；

Fig. 4 is the oil smoke concentration detection apparatus detection principle diagram of the range hood of the embodiment of the present invention；

Fig. 5 is the oil smoke concentration detection apparatus detection schematic diagram of the range hood of the embodiment of the present invention；

Fig. 6 is detection schematic diagram of the range hood of the embodiment of the present invention in the case where oil smoke amount is small；

Fig. 7 is detection schematic diagram of the range hood of the embodiment of the present invention in the case where oil smoke amount is big；

Fig. 8 is the range hood hidden panel of the embodiment of the present invention and the schematic diagram of oil smoke detection device.

Specific embodiment

The present invention will be described in further detail below with reference to the embodiments of the drawings.

Referring to Fig. 1 and Fig. 8, a kind of range hood is side extraction cooking fume extractor, including range hood main body 1 and setting exist Oil smoke concentration detection apparatus 2 in range hood main body 1.For ease of description, in the present specification, "front", "rear", " left side ", " right side ", "upper", "lower" refer to direction when range hood uses with respect to user.

Range hood main body 1 includes shell 11, the blower 12 being arranged in shell 11 and the face that 11 front side of shell is arranged in Plate 13 offers air inlet 14 on panel 13.Oil smoke concentration detection apparatus 2 is arranged on panel 13.In the present embodiment, mainly For the kitchen range 100 of eyes stove, therefore, oil smoke concentration detection apparatus 2 has spaced apart two of left and right, respectively with wherein one A kitchen range 200 is corresponding, and correspondingly, there are two blower 12 also has, two 12 or so compartment of terrain of blower are arranged in parallel, respectively and wherein One kitchen range 200 is corresponding.

Referring to figs. 2 and 3, in the present embodiment, oil smoke concentration detection apparatus 2 include laser emitter 21, frosted glass 22, Diffractive-optical element 23, CCD camera 24 (image sensing unit) and processor 25, frosted glass 22 and diffractive-optical element 23 are set It sets in the laser path that laser emitter 21 emits, and frosted glass 22 is located at the downstream of laser emitter 21, optical diffraction Element 23 is located at the downstream of frosted glass 22.The collimated light beam that laser emitter 21 emits forms Random through frosted glass 22 and dissipates Spot, then diffractive-optical element 23 is penetrated, random speckle is assigned to set common shape feature.During the cooking process, random to dissipate Spot is emitted to cooking zone according to pre-set Laser emission angle, can be led at this time by diffractive-optical element 23 Cross the size of following manner assessment oil smoke amount: when oil smoke amount is big, optical features can touch oil smoke earlier, therefore be dissipated earlier It penetrates；Changed using the distribution of laser speckle with the regularity that distance shows, can detecte out the height that speckle is scattered.Also It is to say, laser speckle height is smaller, and oil smoke concentration is bigger, referring to Fig. 6 and Fig. 7.

The principle detected using laser speckle are as follows: referring to fig. 2 and Fig. 4, B are the position of laser emitter 21, and A is CCD phase The position of machine 24, CE are reference planes P0, and datum plane P1 and reference planes P0 is flat where CCD camera 24 (laser emitter 21) Row.BC is the light that laser emitter 21 emits, and when being irradiated on reference planes P0, reflection light is in 24 imaging surface of CCD camera Reference imaging point F is fallen on P2, when thering is one to block point D in space, light BC will be blocked point D reflection, CCD camera 24 at Actual imaging point G is fallen on image planes P2.At this moment, block the depth information of point D, so that it may by light BC in reference planes P0 and Derivation calculating is carried out in the offset GF of imaging surface after practical reflection.

Apart from for AB=L, 24 focal length of CCD camera is f for known laser transmitter 21 and CCD camera 24, on imaging surface P1 at Picture point offset is GF=p*n, and p is pixel compartments developed width (for the parameter of selected CCD camera 24 itself), and n is offset Pixel compartments amount, the distance between reference planes P0 and 24 place datum plane P1 of CCD camera are H, and blocking point D is in realtime graphic Reference point, then block depth value Dis of the point D in space and can be calculate by the following formula and obtain:

Dis=L*H*f/ (H*p*n+L*f)

Specifically, using the detection method of above-mentioned oil smoke concentration detection apparatus 2, referring to fig. 4 and Fig. 5, include the following steps:

1) reference planes P0 is chosen, obtains the reference picture Q1 on reference planes P0: according to the work of side-suction type range hood Known to the position for making height and oil smoke concentration detection apparatus 2, it would be desirable to which the spatial depth H of detection is 0mm-500mm；For Convenience compares, and selecting the plane of H=500mm, as a reference plane P0, reference planes P0 are located at range hood main body 1 Front side, and it is parallel with laser emitter 21 and 24 place datum plane P1 of CCD camera；At the place of oil smoke concentration detection apparatus 2 Manage speckle image of the light for the sending of laser emitter 21 that a built-in secondary CCD camera 24 is shot in device 25 on reference planes P0 As reference picture Q1 (reference planes P0 such as can be by arranging that plate is formed)；Because depth camera pixel is higher, image data To measure bigger, data processing time is longer, according to robot in the market, the type selecting of camera in the research such as unmanned plane avoidance, at this Select the CCD camera 24 of 320*240 resolution ratio that can meet the requirements in invention；

2) range hood main body 1 is started to work, and at interval of certain time t, such as 10s, shoots laser in a detection zone The realtime graphic Q2 (P3 is plane where the oil smoke taken) of speckle, at this time due to there is the presence of oil smoke, schemes in real time As Q2 is actually less than the distance between reference picture Q1 and CCD camera 24 at a distance from CCD camera 24；

3) coordinate system is arranged in the same relative position of realtime graphic Q2 and reference picture Q1 in processor 25, such as will Coordinate origin is arranged on the pixel of first, each image lower left corner, chooses m*m pixel in the middle realtime graphic Q2 Match block Q4, m is that the quantity of pixel is such as chosen for m=31 in the present embodiment, referring to left side realtime graphic Q2 in Fig. 5 The interior selected range of dotted line frame is match block Q4, and the center pixel of match block Q4 is match point A2；With this It scans for, finds and the most matched an equal amount of picture of match block Q4 within the scope of reference picture Q1 respective coordinates with block Q4 Plain block Q3 (referring to the selected range of dotted line frame in right side reference image Q1 in Fig. 5), the center of block of pixels Q3 has With the most matched pixel A1 of match point A2, according to the coordinate position of the most matched pixel A1 in reference picture Q1, with The difference of the coordinate position of match point A2 in realtime graphic Q2, the transversal displacement that can calculate realtime graphic Q2 and longitudinal direction are partially Shifting amount since CCD camera 24 and laser emitter 21 are placed in same datum plane P1, then has depth in the present invention What is influenced is transversal displacement, and vertical misalignment amount does not have an impact to depth substantially, therefore only calculates transversal displacement n=3；This The principle of step are as follows: laser speckle has the following two kinds property: 1, block in speckle image any point centered on, only with the block phase Block correlation centered on Guan Xinggao, with other points of the speckle image is low；2, in the speckle image of different depth, in a width speckle Block on figure centered on certain point, has on the speckle pattern of another width different depth and only one block property associated therewith is high, with Other block correlations are low, and the coordinate difference between two blocks, related with depth；Correlation can pass through the cross-correlation between calculation block Coefficient judges that cross-correlation coefficient is the similarity degree between two blocks, between naturalization to -1 and 1, closer to 1, and two block phases Guan Xinggeng is big；Block by taking correlation maximum is match block, the coordinate difference between central point to calculate two blocks；

4) transversal displacement obtained by step 3) substitutes into above-mentioned formula Dis=L*H*f/ (H*p*n+L*f), i.e., The spatial depth of match point A2 in realtime graphic Q2 can be obtained, depth is smaller, illustrates that oil smoke amount is bigger, in the present embodiment, such as Setting the distance between laser emitter 21 and CCD camera 24 is L=50mm, and 24 model of CCD camera is selected as f/p=1190, The then relational expression in realtime graphic Q2 between the depth and offset of match point are as follows: Dis=59500/ (n+119), due to step 3) exemplary n=3 in, then Dis=59500/ (3+119)=487.7mm.

In step 3), thus matching different in detection zone can be obtained by the match block of the different coordinates of selection The depth of point, so that concentration distribution of the oil smoke in space in the detection zone is obtained, so that measurement result is more reliable.This Outside, different sections can be preset to depth value, different sections corresponds to different 12 revolving speeds of blower, thus according to depth to wind 12 revolving speed of machine is adjusted correspondingly.

By two oil smoke concentration detection apparatus 2, the revolving speed of corresponding blower 12 can be independently controlled, so that comprehensive inhale Oil smoke effect reaches best.