阅读说明：本技术 对称式收发一体红外对射传感器 (Symmetrical receiving and transmitting integrated infrared correlation sensor ) 是由 龚杰 于 2019-02-12 设计创作，主要内容包括：本发明公开一种对称式收发一体红外对射传感器,组成对射传感器的两部分完全相同,收发一体,成对使用而无需配对；对射传感器的两部分不需要连线,能独立输出对射检测信号。该对射传感器包括装有汇聚透镜的红外接收部件和发射部件,以及产生红外脉冲的驱动电路和处理接收红外信号的解码电路,具备遮挡检测输出和指示接收信号质量的指示灯。该对射传感器交替收发不连续脉冲序列编码的红外信号,可以兼顾对射检测距离和检测响应速度,同时降低发射功耗。使用时只需将两部分安装在被监测通道两侧,通过观察信号质量指示灯调节对准方位,就能在两边同时输出遮挡检测信号,安装调试简便,应用更为灵活。(The invention discloses a symmetrical receiving and transmitting integrated infrared correlation sensor, which has the advantages that two parts forming the correlation sensor are completely the same, are integrated in receiving and transmitting and are used in pairs without pairing; two parts of the correlation sensor do not need to be connected with each other, and can independently output correlation detection signals. The correlation sensor comprises an infrared receiving component and an emitting component which are provided with a convergent lens, a driving circuit for generating infrared pulse, a decoding circuit for processing received infrared signals, and an indicator lamp for shielding detection output and indicating the quality of the received signals. The correlation sensor alternately receives and transmits the infrared signals of the discontinuous pulse sequence codes, can give consideration to correlation detection distance and detection response speed, and simultaneously reduces transmission power consumption. When the device is used, only two parts are needed to be installed on two sides of a monitored channel, the alignment direction is adjusted by observing the signal quality indicator lamp, shielding detection signals can be output on two sides simultaneously, the device is simple and convenient to install and debug, and the device is more flexible to apply.)

1. A symmetrical infrared correlation sensor is composed of two identical parts, can be interchanged at will without pairing, and can respectively output pulses or analog signals reflecting a shielding state. Each section contains: infrared emitting drive circuit, infrared emitting element, signal processing and output circuit, infrared receiving circuit and receiving element, light beam converging lens, signal receiving indicator and light beam converging lens.

2. The symmetrical infrared correlation sensor of claim 1, wherein the receiving beam converging lens and the emitting beam converging lens of the correlation sensor are positioned on the same plane, the main optical axes are parallel, and the infrared emitting element and the receiving element are positioned at the focal point of the lenses; the structural main bodies forming the two parts of the correlation sensor are in a rotational symmetry state after being installed.

3. A symmetric infrared correlation sensor according to claim 1 or 2, wherein the infrared emission circuit generates discontinuous pulse trains to drive the infrared emission elements, the infrared emission driving circuit and the infrared emission elements (r) alternately operate with the infrared receiving circuit and the receiving elements (r), the two parts of the correlation sensor alternately emit and receive, and the brightness or the flicker frequency of the received signal indicator light (c) is used to indicate the quality of the received signal.

4. A symmetric infrared correlation sensor according to claims 1 and 3, characterized in that the emitted infrared signal is set as a discontinuous pulse train, the pulse signal with a period less than T1 and the pulse signal outside the reception window T3 are identified as interference signals, and are removed from the received pulse train; the transceiving period T2 is less than or equal to 10mS, the transmitting time (NxT 1) is less than T2/2, and the number N of pulses transmitted each time is less than or equal to 20.

5. The symmetrical infrared correlation sensor of claim 1, wherein the infrared emission driving circuit and the infrared emission element (r), the signal processing and output circuit (r), the infrared receiving circuit and the receiving element (r), and the received signal indicator lamp (c) are mounted on a circuit board, and two parts constituting the correlation sensor use the same target code and material.

6. The symmetrical IR correlation sensor of claim 2, wherein the correlation sensor structure body has a spring screw ⑦ for adjusting the horizontal direction of the main axis of the lens and a horizontal rotation shaft ⑧, and a mounting bracket ⑨ can be used to fit the outer frame ⑩ around the pitch axisAnd a pitch fixed shaftAnd adjusting the inclination angle of the optical axis in the vertical direction.

Technical Field

The invention relates to an infrared correlation sensor, in particular to an infrared shielding detection sensor with two identical parts, namely receiving and transmitting into a whole and outputting bilaterally.

Background

The infrared correlation sensor comprises a transmitter and a receiver, the infrared transmitter and the infrared receiver are usually respectively fixed on two sides of a monitored channel such as a road, a passageway, an entrance and an exit, when an infrared light beam passing through the detection channel is blocked by a passing pedestrian and a passing vehicle, the receiving component detects the interruption of an infrared signal and outputs a signal representing the occurrence of shielding. The existing infrared correlation sensor needs to distinguish a transmitting end from a receiving end, or distinguish a master end from a slave end, and only one end of the existing infrared correlation sensor can output a shielding detection signal. Such an infrared correlation sensor has material differences or process differences during production, and additional wiring or communication overhead is also added in some applications where detection signals need to be shielded on both sides.

In order to meet the requirement of bilateral output, infrared receiving and transmitting components can be arranged on two sides of the detection channel, or two sets of independent correlation sensors are arranged, and infrared beams are subjected to bidirectional correlation. This solution, in addition to increasing costs, brings about two problems, 1: the bilateral receiving component can not only receive the opposite-side infrared signal, but also receive the direct or reflected signal of the transmitter at the same side, which is not beneficial to correctly judging the occurrence of shielding and accurately calculating shielding time; 2: the bilateral transmitter consumes larger current, and the requirement of low power consumption of an outdoor battery-powered application scene on the infrared correlation sensor is not easily met. The infrared signals generated by the infrared correlation transmitter are of continuous type and pulse type, and the pulse signals can improve the anti-interference capability of the receiver; the infrared transmitter has larger current consumption when transmitting infrared signals, and the average current of the infrared transmitter can be obviously reduced by driving the transmitting element by using pulse signals with low frequency and small duty ratio. Practice proves that the infrared correlation mode of bidirectional transceiving and pulse modulation can effectively avoid the interference of ambient light.

Disclosure of Invention

The invention discloses a symmetrical receiving and transmitting integrated infrared correlation sensor which consists of two identical parts. The signal generator generates a discontinuous pulse code sequence, the discontinuous pulse code sequence drives the infrared emission element after current amplification, and the emitted infrared light beams are converged through the lens; the infrared light signal converged by the receiving lens enters the receiving element to be converted into an electric signal, the electric signal is amplified and decoded by the processing circuit to output a shielding detection signal, and meanwhile, acousto-optic output for indicating the quality of the received signal is also provided.

The invention has the advantages that the two parts forming the correlation sensor are completely the same, the two parts are mutually independent, no connection line is needed, and no pairing is needed, thereby being convenient for production, installation and debugging; detection output and signal quality indication can be provided at two sides of the detection channel simultaneously, no extra channel cost is needed, and the use is more flexible; the infrared correlation sensor adopts a discontinuous pulse sequence, so that the power consumption is reduced while the effective distance and the anti-interference capability are ensured.

In one embodiment of the present invention, the period and number of pulses of the infrared signal are agreed and limited, and a set of pulses of a certain number are transmitted at regular intervals, the number of pulses and the time interval being characteristic for distinguishing the interfering signal from the valid signal. In the example shown in fig. 2, the transceiving period is T2, where the number of pulses transmitted on the a side of the transmitting period is 8, the pulse period is T1, and T3 is the receiving window time of the B-side receiving module. When the side B receives a group of 8 pulses in the correct window time, the one-time receiving without shielding is completed; and then the sensor at the side A enters a receiving period, the side B transmits a group of 8 pulses with the period of T1, the duration is less than T3, and if the side A also receives the pulses correctly, one-time non-shielding two-way correlation detection is completed. A. The two parts B are alternately transmitted and received and are circularly reciprocated. Thus, 1, the duration time of the emission current can be reduced, and the emission power consumption can be reduced; 2, the direct or reflected interference of the A-side transmitted signal on the A-side infrared receiving element can be avoided; 3 when the receiving and transmitting time sequences of the two sides are not synchronous, adjusting the starting time of a receiving window T3 according to the number of received pulses and the receiving and transmitting cycle time T2, thereby keeping the two-side receiving and transmitting coordinated and synchronous all the time; 4, the receiving and decoding circuit counts the number of effective pulses received within a certain time, converts the effective pulses into acousto-optic signals to indicate the receiving quality, and is used for adjusting the alignment of infrared beams at two sides in the installation and debugging stage; and 5, the number of continuously lost pulses plus the receiving and transmitting interval can accurately measure and calculate the shielding time.

Drawings

The invention is further illustrated with reference to the following figures and examples.

FIG. 1 is a schematic view of the present invention;

FIG. 2 is an example structure of the present invention;

FIG. 3 is a timing diagram illustrating exemplary transceiving operations according to the present invention;

in the figure, ①, an infrared emission driving circuit and an infrared emission element ②, a signal processing and output circuit ③, an infrared receiving circuit and a receiving element ④, an infrared emission convergent lens ⑤, a received signal indicator ⑥, a receiving convergent lens ⑦, a spring screw ⑧ for adjusting the left and right directions, a horizontal rotating shaft ⑨, a mounting bracket ⑩, an outer frame bracket ②, a signal processing and output circuit, a signal processing and receiving element ④, a signal processing and output element, aPitch axisA pitching fixed shaft; a1 represents that the A side of the transmission period transmits infrared signals to the B side, and B1 represents that the A side of the reception period receives infrared signals transmitted by the B side.

Detailed Description

Example (c): the receiving and transmitting converging lenses of the correlation sensor are positioned on the same plane, the main optical axes are parallel, the infrared transmitting element and the receiving element are positioned at the focal positions of the lenses, the A-side correlation sensor and the B-side correlation sensor are oppositely arranged, the inclination angle in the vertical and horizontal directions is adjusted around the rotating shaft ((R)), so that the main optical axes of the A-side transmitting lens and the B-side receiving lens are as close as possible, and the main optical axes of the A-side receiving lens and the B-side transmitting lens are as close as possible. After any side is powered on, the receiving period is started, the pulse is not received within 3 seconds, the transmitting period is started, one pulse is transmitted at the time of T1, and 8 pulses form a group. The receiving period is timed from the receipt of the pulse, if 8 pulses with the period of T1 are received in the time of T3, 8 pulses with the period of T1 are transmitted, the other side is in the receiving state, if no shielding occurs, the group of 8 pulses is completely received, and then a new round of transmission is started. When the transceiving timings at the two sides of A, B are not synchronized, the signal processing circuit adjusts the start-stop time of the receiving window T3 according to the receiving pulse number N and the transmitting interval time T2, thereby keeping the two-side transceiving to be always coordinated and synchronized.

The example of FIG. 3 has a T1 period of about 30uS, a total transceiving period T2 of about 6mS, a receive window time T3 of 350uS, and a pulse width of about 10 uS. The pulse signal provides current for the infrared emitting element through the driving circuit, the infrared emitting element is turned on at a high level to emit infrared light, and the driving circuit is turned off at a low level to not emit infrared light. It can be seen that the emission time of the infrared signal in the 6mS transceiving period is only 80uS in total, and the consumed current is small on average in the whole period. A. And B, the two sides receive and transmit alternately, a group of 8 pulses which are continuously lost are used as a shielding detection condition, and the two sides can detect and identify whenever the shielding starts and as long as the continuous shielding time exceeds 10mS, so that the requirements on the detection response speed of vehicles and pedestrians can be completely met.

Relatively distant correlation sensors require converging the transmitted beams to increase effective distance, the beam angle is usually small, and therefore careful adjustment of the receiver axis is required and the received effective signal energy density is converted into an acousto-optic signal to indicate alignment. In this example, thanks to the bilateral alternate transceiving, the receiving circuit amplifies the decoded effective pulse number, converts it into the flashing frequency of the indicator light (c), and adjusts the alignment orientation of the correlation sensor on both sides according to the state of the indicator light in sequence, thus achieving bilateral mutual alignment. The pulse width output by the signal processing and output circuit is basically consistent with the shielding time, 2 pairs of opposite sensors are arranged along the monitored channel at a certain distance, and the front edge and the rear edge of the output pulse can be used for calculating the length, the movement speed, the movement direction and other characteristics of the shielding object.

The signal Processing and decoding Circuit modules or units involved in the embodiments of the present invention can be implemented by general-purpose Integrated circuits, such as a CPU (Central Processing Unit), or by an ASIC (application specific Integrated Circuit).

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.