Array type visibility detector and application method thereof

Abstract

The invention discloses an array type visibility detector and an application method thereof, and relates to the technical field of visibility detectors, the array type visibility detector comprises a support connected between an optical emitter and an optical receiver, a signal processing module and a data output and control module, the support comprises an emitter support, a receiver support and a horizontal connecting frame, and the emitter support and the receiver support are rotationally arranged at the ends of the horizontal connecting frame respectively. The deflection angle of the optical transmitter and the deflection angle of the optical receiver are adjusted in a connecting rod driving mode, and compared with a gear set mode in the prior art, the situation that gears are prone to abrasion and need to be supported by the meshing position of the gears is avoided; and the connecting rod drives the optical transmitter and the optical receiver to rotate, and a two-point supporting mode is adopted in a stable mode, so that the stability of the optical transmitter and the optical receiver after positioning is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of visibility detector, and particularly relates to an array type visibility detector and an application method thereof. BACKGROUND

[0002] The array type visibility detector is widely applied in the field of highway traffic. For the road sections such as highway tunnel entrance and mountainous curve where fog frequently occurs, the array type visibility detector can be quickly deployed for networking monitoring, trigger linkage measures such as tunnel lighting enhancement, and can also interwork with vehicle-mounted navigation system data to push the real-time visibility of the front road section to the driver.

[0003] The working process is to emit a specific wavelength infrared light beam, receive the scattering signal of particulate matters in the target area, analyze the light intensity attenuation law, and inversely calculate the visibility value. Therefore, the structure thereof comprises an optical emission module, an optical receiving module, a signal processing module, a data output and control module, and a bracket for connecting the modules.

[0004] In the prior art, the optical emission module and the optical receiving module are rotated on the horizontal connecting frame through the optical emission bracket and the optical receiving bracket. The driving mode is mainly to drive the deflection by the rotating motor. In the prior art, the motor directly drives the deflection, and the adjustment error is large. Therefore, the conventional selection is to adjust the deflection of the optical emission bracket and the optical receiving bracket through the gear set at the output end of the motor, that is, by changing the gear engagement ratio of the gear set, the deflection angle is easily controlled.

[0005] After the driving mode of the gear set is adopted, the following problems exist. Because the support of the optical emission bracket and the optical receiving bracket mainly relies on the meshing of the gears in the gear set, but the gear meshing part is prone to wear after long-term use of the gear set, which causes the loosening of the optical emission bracket and the optical receiving bracket, and thus one of the optical emission bracket or the optical receiving bracket has a deflection error. In addition, the support force of the optical emission bracket and the optical receiving bracket mainly relies on the gear set at the end, and the center of gravity of the optical emission bracket and the optical receiving bracket is located below, so long-term use also easily causes the deformation of the bracket or increases the wear degree of the gear set, and thus affects the deflection error of one of the optical emission bracket or the optical receiving bracket. The deflection error directly affects the detection effect of the visibility detector, that is, when the angles of the optical emission module and the optical receiving module are inconsistent, the following problems exist:

[0006] 1. Signal acquisition efficiency: The core principle of array visibility detector (especially forward / backward scattering type) is to capture the light signal scattered by particles in the atmosphere through the receiver. If the transmitter and receiver do not match the tilt angle (such as designed as 42° angle, actual deviation is too large), it will cause the "light signal intersection area" of the two to deviate from the preset sampling space, and may cause the receiver to capture no scattered light, or the captured signal strength is too weak / strong, which directly leads to invalid or distorted detection data.

[0007] 2. Measurement accuracy deviation: The calculation of visibility needs to be based on the corresponding relationship between "scattered light intensity in the preset sampling space" and "atmospheric extinction coefficient", and this corresponding relationship is calibrated at a specific receiving angle. If the actual angle is different from the design value, it will break this calibration relationship, even if the signal can be acquired, the calculated visibility value will also have significant deviation from the true value (such as underestimating or overestimating visibility). SUMMARY

[0008] The purpose of the present application is to solve the problem that the driving mode of the gear set in the prior art easily leads to the mismatch of the tilt angle of the transmitter and receiver, and a kind of array visibility detector and its application method are proposed.

[0009] In order to achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0010] An array visibility detector, comprising a bracket connected between an optical transmitter and an optical receiver, a signal processing module and a data output and control module, the bracket comprises a transmitter bracket, a receiver bracket and a horizontal connecting frame, the transmitter bracket and the receiver bracket are respectively rotated on the end of the horizontal connecting frame, and the optical transmitter and the optical receiver are respectively installed on the transmitter bracket and the receiver bracket;

[0011] A connecting seat is arranged below the center of the bottom of the bracket, and extension seats are arranged on both sides of the connecting seat, and the two extension seats are connected with the transmitter bracket and the receiver bracket respectively through connecting rods;

[0012] A first distance measuring assembly is arranged below the horizontal connecting frame, and the first distance measuring assembly measures the distance between the horizontal connecting frame and the connecting seat;

[0013] Second receivers are arranged on both sides of the connecting seat, and the second receivers measure the distance between the connecting seat and the extension seat.

[0014] Preferably, the first distance measuring assembly is composed of a first transmitter and a first receiver;

[0015] The second receiver is composed of a second transmitter and a second receiver.

[0016] Preferably, the transmitter support, the receiver support and the horizontal connecting frame are connected by shaft A.

[0017] Preferably, the ends of the two connecting rods are respectively connected by shaft B between the transmitter support and the receiver support.

[0018] Preferably, the center of shaft A on the transmitter support and the center of shaft B are arranged along the length direction of the transmitter support.

[0019] The center of shaft A on the receiver support and the center of shaft B are arranged along the length direction of the receiver support.

[0020] Preferably, the connecting rod and the extension seat are connected by shaft C, and the center of shaft C and the center of shaft B are arranged along the length direction of the connecting rod.

[0021] Preferably, the distance measured by the first distance measuring component is the projection distance of the center of shaft C and the center of shaft A in the vertical direction.

[0022] Preferably, the distance measured by the second receiver is the distance between the center line of the extension seat in the vertical direction and the center of shaft C.

[0023] Preferably, at least one passive telescopic rod arranged vertically is further connected between the transmitter support, the receiver support and the horizontal connecting frame, one end of the passive telescopic rod slides along the length direction of the horizontal connecting frame, and the other end is connected by shaft D on the side wall of the transmitter support or the receiver support, and the center of shaft D is located on the straight line of the center of shaft A and the center of shaft B.

[0024] The passive telescopic rod is provided with a calibration distance measuring component for measuring the projection distance of the center of shaft D and the center of shaft A in the vertical direction.

[0025] The application further discloses an application method of the array type visibility detector.

[0026] Rotation adjustment of the optical transmitter and the optical receiver: the angle of the transmitter support and the receiver support is adjusted by adjusting the positions of the connecting seat and the extension seat and the state of the connecting rod.

[0027] Rotation angle measurement of the optical transmitter and the optical receiver: the rotation angle of the optical transmitter and the optical receiver is calculated according to the measurement results of the first distance measuring component and the second receiver.

[0028] The application has the following beneficial effects:

[0029] The application adopts the driving mode of connecting rods to adjust the deflection angles of the optical transmitter and the optical receiver, compared with the gear set mode in the prior art, the effect of avoiding the easy wear of the gear and the support relying on the meshing part of the gear is avoided, and meanwhile, in the application, the optical transmitter and the optical receiver are rotationally connected based on the horizontal connecting frame, and the connecting rods drive the rotation of the optical transmitter and the optical receiver, in the stable mode, the two-point support mode is adopted to ensure the stability of the optical transmitter and the optical receiver after positioning.

[0030] The application also measures and calculates the deflection angles of the optical transmitter and the optical receiver through the movement of the connecting seat and the extension seat, the cooperation of the first distance measuring assembly and the second receiver, compared with the angle sensor measurement in the prior art, the measurement is affected by the wear degree and the support of the gear set, while the adjustment mode of the application is stable, and the accuracy of the measurement data is ensured.

[0031] Finally, the application also provides passive telescopic rods and calibration distance measuring assemblies, which can detect the bending state of the transmitter support and the receiver support, ensure the stability of the transmitter support and the receiver support, and further ensure that the deflection angles of the optical transmitter and the optical receiver are the same, and ensure the accuracy of the detection data. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 A structural schematic diagram of an array type visibility detector is provided for the application;

[0033] Figure 2 A structural schematic diagram of a support, a connecting seat, an extension seat and a connecting rod is provided for the application;

[0034] Figure 3 A principle diagram for measuring the deflection angle of an optical transmitter or an optical receiver is provided for the application;

[0035] Figure 4 A principle diagram for judging the bending state of a transmitter support or a receiver support is provided for the application.

[0036] In the figure: 1, optical transmitter; 2, optical receiver; 3, support; 30, transmitter support; 31, receiver support; 32, horizontal connecting frame; 4, connecting seat; 5, extension seat; 6, connecting rod; 7, passive telescopic rod. DETAILED DESCRIPTION

[0037] Reference Figures 1-4 An array type visibility detector, comprising a support 3 connected between an optical transmitter 1 and an optical receiver 2, a signal processing module and a data output and control module, wherein the signal processing module and the data output and control module are concentrated in a control box, and the control box is fixedly installed on the support 3 by means of bolts or welding.

[0038] Optical transmitter 1 and optical receiver 2 are prior art, in some embodiments, optical transmitter 1 is usually composed of LED light source or laser diode, responsible for emitting stable infrared light or visible light beam in a certain direction as a detection signal source; Optical receiver 2 uses array type photoelectric sensor such as CCD or CMOS array to receive light signal scattered by particles in the atmosphere such as haze, fog, dust, etc., which can capture scattered light at different angles at the same time, improving the comprehensiveness of data acquisition.

[0039] The present application file is improved in the prior art, the mounting bracket 3 of optical transmitter 1 and optical receiver 2 is improved in structure, the connecting rod adjusting mode is adopted instead of the mode of cooperating with transmission gear set in the prior art, further, the deflection angle of optical transmitter 1 and optical receiver 2 is measured by two distance measuring sensors.

[0040] The improvement of the prior art of the bracket 3 in this embodiment is as follows:

[0041] The bracket 3 includes transmitter bracket 30, receiver bracket 31 and horizontal connecting frame 32, optical transmitter 1 and optical receiver 2 are respectively installed on the transmitter bracket 30 and the receiver bracket 31, wherein the installation mode can be plug-in or bolt positioning mode. Preferably, the end of optical transmitter 1 and optical receiver 2 is provided with a plug-in part, the transmitter bracket 30 and the receiver bracket 31 are provided with a plug-in slot corresponding to the plug-in part, after the plug-in part is inserted into the plug-in slot, it is positioned by bolt or clamping.

[0042] Further, the transmitter bracket 30 and the receiver bracket 31 are respectively rotated on the end of the horizontal connecting frame 32, preferably, the transmitter bracket 30, the receiver bracket 31 and the horizontal connecting frame 32 are connected by shaft A.

[0043] Further, the bottom center of the bracket 3 is provided with a connecting seat 4, the two sides of the connecting seat 4 are provided with extension seats 5, the two extension seats 5 are connected with the transmitter bracket 30 and the receiver bracket 31 through connecting rods 6 respectively, preferably, the ends of the two connecting rods 6 are respectively connected with the transmitter bracket 30 and the receiver bracket 31 through shaft B; in addition, the connecting rod 6 and the extension seat 5 are connected through shaft C.

[0044] In this embodiment, the deflection angle of optical transmitter 1 and optical receiver 2 is adjusted by adjusting the transmitter bracket 30 and the receiver bracket 31, further, the adjustment mode is: first, adjust the distance of the connecting seat 4 in the vertical direction, then adjust the distance of the extension seat 5 extending outward relative to the connecting seat 4, adjust the deflection angle of the transmitter bracket 30 and the receiver bracket 31 through the connecting rod 6.

[0045] It should be noted that: the outward movement of the two extension seats 5 can be driven by the same driving component, such as a double-headed screw, to ensure that the outward movement distance of the two extension seats 5 is always the same; in other embodiments, the two extension seats 5 can also be controlled to move by independent air cylinders, push rod motors or other linear driving components.

[0046] Based on the above support 3 structure and the adjustment structure of the optical transmitter 1 and the optical receiver 2, the embodiment discloses a calculation method for measuring the angle of the optical transmitter 1 and the optical receiver 2, which mainly depends on the first distance measuring component and the second receiver.

[0047] The first distance measuring component is arranged below the horizontal connecting frame 32, and the first distance measuring component measures the distance between the horizontal connecting frame 32 and the connecting seat 4. Specifically, the distance measured by the first distance measuring component is the projection distance of the center of the shaft C and the center of the shaft A in the vertical direction, which is denoted as H1.

[0048] The second receiver is arranged on both sides of the connecting seat 4, and the second receiver measures the distance between the connecting seat 4 and the extension seat 5. Specifically, the distance measured by the second receiver is the distance between the shaft C and the vertical center line of the connecting seat 4, which is denoted as H2.

[0049] Referring to Figure 3 , after obtaining the H1 and H2 values measured, the deflection angles of the optical transmitter 1 and the optical receiver 2 are obtained by combining the positions of the shaft A and the shaft B, using the triangle and inverse triangle functions. Although the required angle value is obtained by two distance measurements and calculations, this method changes the direct use of the angle measuring instrument in the prior art, which is easily affected by the position deviation caused by gear friction. Compared with the prior art, the detection of the present application is driven by a hardware gear set, and the support of the prior art completely relies on the gear shaft. The present application increases the stress points by the two-point support method, i.e. the stress points of the shaft A and the shaft B, so that the optical transmitter 1 and the optical receiver 2 are more stable after installation and have less influence.

[0050] Referring to Figure 2 and 3 , the shaft A is the A point marked in Figure 3 , the shaft B is the B point marked in Figure 3 , the vertical projection point of the center of the connecting seat 4 on the horizontal connecting frame 32 is the D point, the shaft C is the C point marked in Figure 3 , and the vertical projection point of the center of the shaft C on the connecting seat 4 is the E point. Among them, the length between AB is a constant value, denoted as H3, because the position of the shaft B is stable; the length between AD is a constant value, denoted as H4, because the connecting position between the connecting seat 4 and the horizontal connecting frame 32 is fixed; the length between DE is H1; the length between CE is H2; the length between CB is a constant value, denoted as the length of the connecting rod 6, denoted as H5.

[0051] Referring to Figure 2 and Figure 3 When the deflection angle of the optical transmitter 1 and the optical receiver 2 is adjusted, the positions of the C point and the E point change. To facilitate calculation of the deflection angle of the optical transmitter 1 and the optical receiver 2, the AC line is drawn, and the distance is denoted as H6. After the AC line is drawn, the deflection angle of the optical transmitter 1 or the optical receiver 2 is divided into a and b.

[0052] Further, the formula for calculating the deflection angle of the optical transmitter 1 or the optical receiver 2 is as follows:

[0053] The deflection angle of the optical transmitter 1 or the optical receiver 2 is calculated as a+b.

[0054] Wherein, a=arctan[H1 / H4-H2]; b=arccos[H6 2 +H3 2 -H5 2 / 2×H3×H6]; H6=[H1 2 +H4-H2 2 ] 1 / 2 .

[0055] In some embodiments, to ensure the accuracy of the length between AB, that is, to ensure that the AB line is horizontal to the length direction of the transmitter support 30 after being drawn, the center of the axis A and the center of the axis B are arranged along the length direction of the transmitter support 30. Similarly, the center of the axis A and the center of the axis B on the receiver support 31 are arranged along the length direction of the receiver support 31.

[0056] Further, to ensure the accuracy of the length between BC, that is, to ensure that the center of the axis C and the center of the axis B are arranged along the length direction of the connecting rod 6, and the length of BC is equal to the length of the connecting rod 6. Specifically, in the actual determination process, the length of BC needs to consider the installation position of the axis C and the axis B and the radius of the axis C and the axis B. For example, the distance between the outermost wall of the axis C and the end of the connecting rod is Z, the distance between the outermost wall of the axis B and the end of the connecting rod is K, the radius of the axis C is L, the radius of the axis B is F, and the length of the connecting rod 6 is G. Then the length of BC is G-Z-K-L-F.

[0057] In this embodiment, the first ranging assembly is composed of a first transmitter and a first receiver. It should be noted that: 1, the initial position of the first transmitter and the first receiver is located on the horizontal line of AD, which ensures the accuracy of H1 data measurement. 2, E point is set as the ranging point of the first ranging assembly, wherein a detection groove is arranged in the connecting seat 4, and the E point is located on the groove bottom surface of the detection groove. The moving part for driving the connecting seat 4 can be a linear driving part such as a cylinder or a push rod motor. In order to protect the first ranging assembly, a telescopic sleeve can be connected between the connecting seat 4 and the horizontal connecting frame 32. The telescopic sleeve is composed of an inner sleeve and an outer sleeve. The inner sleeve slides in the outer sleeve. The first ranging assembly and the linear driving part for driving the connecting seat 4 are located in the telescopic sleeve.

[0058] Further, the second receiver is composed of a second transmitter and a second receiver. It should be noted that: 1, the initial position of the second transmitter and the second receiver is located on the horizontal line of DE, which ensures the accuracy of H2 data measurement. 2, when measuring the H2 distance, the thickness of the extension seat 5 and the radius of the shaft C need to be considered sometimes, because the ranging point of the second receiver is generally on the outer wall of the extension seat 5, so the thickness of the extension seat 5 and the radius of the shaft C need to be added based on the ranging of the second receiver. In some other ways, the distance of the installation position of the shaft C also needs to be considered. 3, a telescopic sleeve can also be added between the extension seat 5 and the connecting seat. The structure of the telescopic sleeve is the same as that of the telescopic sleeve between the connecting seat 4 and the horizontal connecting frame 32, which protects the second receiver and the linear driving part for driving the horizontal sliding of the extension seat 5.

[0059] Finally, in some embodiments, based on the way of driving the optical transmitter 1 and the optical receiver 2 by the connecting seat and the connecting rod, the present application also sets a calibration assembly. When the transmitter support 30 and the receiver support 31 are deformed during long-term outdoor use, such as being impacted by flying stones and the like, the length between the shaft A and the shaft B in the transmitter support 30 is bent at some point, which affects the measurement accuracy of the deflection angle of the transmitter support 30. Therefore, a calibration detection assembly is also provided, which is specifically set as follows:

[0060] Referring to Figure 4 , the transmitter support 30, the receiver support 31 and the horizontal connecting frame 32 are also connected with at least one vertically arranged passive telescopic rod 7. One end of the passive telescopic rod 7 slides horizontally along the length direction of the horizontal connecting frame 32, and the other end is rotationally connected to the side wall of the transmitter support 30 or the receiver support 31 through the shaft D. The center of the shaft D is located on the straight line between the center of the shaft A and the center of the shaft B. With the deflection of the transmitter support 30 or the receiver support 31, the length of the passive telescopic rod 7 and the connection position of the passive telescopic rod 7 and the horizontal connecting frame 32 change.

[0061] The passive telescopic rod 7 is provided with a calibration distance measuring assembly, which measures the distance between the center of the shaft D and the center of the shaft A in the vertical direction.

[0062] Based on this, the deflection angle of the optical transmitter 1 or the optical receiver 2 is Q through the measurement of H1 and H2 in the present application, wherein the length between the shaft A and the shaft D is a constant value, denoted as H7, and then it is calculated that the distance between the shaft D and the shaft A in the vertical direction is F=H7×arcsinQ, and the data measured by the calibration distance measuring assembly is H8, and the values of H8 and F are compared to determine whether the transmitter support 30 or the receiver support 31 is bent, that is, when the values of H8 and F are different or there is a significant error, the transmitter support 30 or the receiver support 31 is deformed significantly, and at this time, it can be repaired or manually corrected; when the values of H8 and F are the same, the transmitter support 30 or the receiver support 31 is normal and will not affect the normal use.

[0063] The calibration distance measuring assembly is the same as the first distance measuring assembly or the second receiver.

[0064] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. An array-type visibility detector comprising a support (3) connected between an optical transmitter (1) and an optical receiver (2), a signal processing module and a data output and control module, characterized in that, The support (3) comprises a transmitter support (30), a receiver support (31) and a horizontal connecting support (32), the transmitter support (30) and the receiver support (31) are respectively rotated on the end of the horizontal connecting support (32), and the optical transmitter (1) and the optical receiver (2) are respectively installed on the transmitter support (30) and the receiver support (31); The bottom center of the support (3) is provided with a connecting seat (4), the two sides of the connecting seat (4) are provided with extension seats (5), and the two extension seats (5) are respectively connected with the transmitter support (30) and the receiver support (31) through connecting rods (6); The horizontal connecting support (32) is provided with a first distance measuring assembly below, the first distance measuring assembly measures the distance between the horizontal connecting support (32) and the connecting seat (4); The two sides of the connecting seat (4) are provided with second receivers, and the second receivers measure the distance between the connecting seat (4) and the extension seat (5).

2. The array type visibility probe according to claim 1, wherein, The first distance measuring assembly is composed of a first transmitter and a first receiver; The second receiver is composed of a second transmitter and a second receiver.

3. The array type visibility probe according to claim 1, wherein, The transmitter support (30), the receiver support (31) and the horizontal connecting support (32) are rotationally connected through shaft A.

4. The array type visibility probe according to claim 3, wherein, The ends of the two connecting rods (6) are respectively rotationally connected with the transmitter support (30) and the receiver support (31) through shaft B.

5. The array-type visibility probe according to claim 4, wherein The shaft A center on the transmitter support (30) and the shaft B center are arranged along the length direction of the transmitter support (30); The shaft A center on the receiver support (31) and the shaft B center are arranged along the length direction of the receiver support (31).

6. The array type visibility probe according to claim 4, wherein The connecting rod (6) and the extension seat (5) are rotationally connected through shaft C, the center of the shaft C and the center of the shaft B are arranged along the length direction of the connecting rod (6).

7. The array type visibility probe according to claim 6, wherein The distance measured by the first distance measuring assembly is the projection distance of the center of the shaft C and the center of the shaft A in the vertical direction.

8. The array type visibility probe according to claim 6, wherein, The distance measured by the second receiver is the distance between the center line of the shaft C and the connecting seat (4) in the vertical direction.

9. The array type visibility probe according to claim 4, wherein, The transmitter support (30), the receiver support (31) and the horizontal connecting support (32) are further connected with at least one vertically arranged passive telescopic rod (7), one end of the passive telescopic rod (7) slides horizontally along the length direction of the horizontal connecting support (32), the other end is rotationally connected on the side wall of the transmitter support (30) or the receiver support (31) through shaft D, and the center of the shaft D is located on the straight line of the center of the shaft A and the center of the shaft B; The passive telescopic rod (7) is provided with a calibration distance measuring assembly, which measures the projection distance of the center of the shaft D and the center of the shaft A in the vertical direction.

10. The method of using an array-type visibility probe according to claim 9, wherein, The method comprises the following steps: Rotation adjustment of the optical transmitter (1) and the optical receiver (2): by adjusting the positions of the connecting seat (4) and the extension seat (5), adjusting the state of the connecting rod (6), and adjusting the angles of the transmitter support (30) and the receiver support (31); Rotation angle measurement of the optical transmitter (1) and the optical receiver (2): The results of the first distance measurement component and the second receiver measurement are used to calculate the rotation angle of the optical transmitter (1) and the optical receiver (2).

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