CN112146752B - Calibration device for measuring light intensity distribution characteristics of road traffic signal lamp - Google Patents
Calibration device for measuring light intensity distribution characteristics of road traffic signal lamp Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J1/4228—Photometry, e.g. photographic exposure meter using electric radiation detectors arrangements with two or more detectors, e.g. for sensitivity compensation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
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Abstract
The invention discloses a calibration device for measuring the light intensity distribution characteristics of a road traffic signal lamp, which comprises an initial position positioning unit, a light source receiving unit, a light intensity distribution control unit and a monitoring unit, wherein the initial position positioning unit is used for positioning the initial position of the road traffic signal lamp; starting an initial position positioning unit for completing the determination and acquisition of the measurement zero point of the light intensity distribution control unit on the light source receiving unit; starting a light intensity distribution control unit, moving the light intensity distribution control unit to the position of a point to be detected of a light source receiving unit, and collecting corresponding light intensity data of a signal lamp at the position of the point to be detected; in the process of collecting light intensity data, the monitoring unit collects stability data of the signal lamp and corrects light intensity distribution data. The signal lamp is not moved, the detector runs, and the measurement errors caused by the problems of change of the rotary ignition point posture of the signal lamp, non-coincident rotary shaft space, filament deformation, instability of a light source in the measurement process, angle errors caused by a rotary table for placing the light source and the like are eliminated.
Description
Technical Field
The invention relates to a calibration device for measuring light intensity distribution characteristics of a road traffic signal lamp, and belongs to the technical field of signal lamp light intensity distribution measurement.
Background
The traffic light as the urban traffic guidance bar plays more and more important roles in maintaining traffic order, guaranteeing traffic safety and the like. Traffic signal lights: the traffic signal lamp can be divided into 3 types of motor vehicles, non-motor vehicles and pedestrian street crossing signal lamps according to the purpose. The signal lamps of motor vehicles and non-motor vehicles usually have three colors of red, green and yellow; the pedestrian street-crossing signal lamp usually has two colors of red and green.
GB 14887 plus 2011 road traffic signal specifies the luminous intensity of a traffic signal: the luminous intensity measurement distance was 10 m. The luminous intensity of a reference axis of a luminous unit of the non-motor vehicle signal lamp, the left-turning non-motor vehicle signal lamp and the pedestrian crossing signal lamp adopting the LED sketching patterns is not less than 150cd and not more than 400cd, and the luminous intensity in other directions is not less than the specification in a table:
the traditional method for measuring the light intensity distribution characteristics of the road traffic signal lamp mainly adopts a fixed detector method, a detector is fixed at the zero position of a center, the road traffic signal lamp is installed on a rotary table, the angle of the signal lamp is changed by rotating the rotary table, and the detector positioned at the center is irradiated, so that light intensity data under different angle distributions are approximately obtained. This has the following disadvantages.
(1) The rotation of the signal lamp in the non-horizontal direction can change the ignition gesture of the lamp, the change of the ignition gesture can cause the thermal balance of a light source of the signal lamp to be damaged, the thermal balance is damaged to cause the change of the temperature, and then the luminous efficacy and the luminous intensity of the LED or the halogen lamp are changed, and finally, a larger measurement error is introduced.
(2) The signal lamp is composed of a light source and a face cover. The problem that the rotating shaft of the signal lamp is difficult to determine exists by adopting a signal lamp rotation measuring mode; secondly, the rotating shaft of the lamp and the rotating shaft of the rotary table are coaxial, so that accurate measurement can be realized. However, both axes of rotation are not spatially visible, so that coaxiality is difficult to achieve and large measurement errors are introduced.
(3) The light emitting of the lamp product is not absolutely stable, the error caused by the stability is not only related to the type of the lamp, but also the individual lamps of the same manufacturer, the same model and the same batch have the difference of the light emitting stability. Therefore, the stability of the signal lighting introduces certain measurement errors.
(4) When the incandescent lamp and the low-voltage halogen lamp rotate in a non-horizontal mode, the filament of the incandescent lamp and the low-voltage halogen lamp can deform slightly under the action of gravity, and changes of light intensity values can be caused, so that certain measuring errors are introduced.
Disclosure of Invention
The purpose of the invention is as follows: according to the requirements of national standards, the invention provides a calibration device for measuring the light intensity distribution characteristics of a road traffic signal lamp. The object of the calibration device of the present invention is to overcome the problems and drawbacks of the prior art; the change of the rotary ignition posture of the signal lamp, the misalignment of the rotating shaft space, the filament deformation, the instability of the luminous intensity in the measuring process, and the measuring errors caused by the angle errors and other problems caused by the rotary table for placing the light source are eliminated.
The technical scheme is as follows: a calibration device for measuring the light intensity distribution characteristics of a road traffic signal lamp comprises an initial position positioning unit, a light source receiving unit, a light intensity distribution control unit and a monitoring unit.
Lighting a signal lamp, starting the initial position positioning unit, and determining and collecting a measurement zero point of the light intensity distribution control unit on the light source receiving unit; starting a light intensity distribution control unit, moving the light intensity distribution control unit to the position of a point to be detected of a light source receiving unit, and acquiring corresponding light intensity data of a signal lamp at the position of the point to be detected by using an image acquisition unit; in the process of collecting light intensity data, the monitoring unit collects stability data of the signal lamp and corrects the light intensity distribution data.
The initial position positioning unit: the device comprises an industrial camera, a level, a reference object, a laser and a cross demarcation device; the reference object is arranged at the top end of the signal lamp, mechanical alignment is carried out through the level gauge, the reference object at the top end of the signal lamp is overlapped with the center of the cross reticle on the light source receiving unit, and the horizontal azimuth angle of the signal lamp is consistent with the horizontal azimuth angle of the light source receiving unit through the cross reticle; the initial position positioning unit loads an industrial camera to acquire an image through the image acquisition unit; and opening an image acquisition interface of the industrial camera, and storing the image when the image to be displayed meets the requirement.
The light source receiving unit: the device is designed according to the requirements of national standards on measuring positions, and consists of six light source receiving modules, wherein the diameter size of the light source receiving modules is not less than 15 cm.
The reflectivity of the light source receiving module is less than 5%.
The light intensity distribution control unit: the device consists of a translation table and a light intensity detector with indication error superior to 1%, wherein a support is processed to install a light intensity detector group on the translation table and is fixed by screws.
And starting the translation table to move, selecting a horizontal/vertical light intensity distribution detection unit through a software interface according to the position to be detected, selecting an interpolation motion label, and controlling and starting the translation table to move. The operations were performed in the order of L (0 ° ) → L (-15 °, 0 °) → L (-10 °, +10 °) → L (0 °, +10 °) → L (+10 ° ) → L (+15 °, 0 °). When the translation table drives the light intensity detector to operate to the position of the point to be measured, the image acquisition unit is used for acquiring the corresponding light intensity of the signal lamp. The luminous intensity of the signal lamp under each position coordinate is collected respectively, data are stored once, and complete light intensity measurement data are displayed after 6 groups of data are collected and stored.
Controlling the translation stage: the motion method is classified into two cases, i.e., linear motion and linear interpolation motion. In each case, variable parameters of initial velocity, maximum velocity, acceleration, and travel distance are set.
A monitoring unit: and eliminating the instability error of the light source, the light intensity error in the light intensity distribution control unit and the cosine error in a calculation mode by software.
The working principle is as follows: and (4) lighting a signal lamp, and starting an initial position positioning unit for completing the determination and collection of the measurement zero point of the light intensity detector. The method comprises the following steps: the geometric center position of a light spot generated by a signal lamp on a light source receiving unit is determined by a level gauge and a cross line projector as a reference position coordinate L (0 degrees and 0 degrees). And a position point 5 degrees below the geometric center of the light spot is set as a measurement zero point. And respectively installing reflective marks on the surfaces of the measurement zero point and the shading cover of the light intensity detector, calculating by using an industrial camera and software, acquiring position coordinates of the measurement zero point and the light intensity detector on the CCD image surface, starting the translation table to move, and moving the light intensity detector to the measurement zero point.
The light shielding cover is removed and the light intensity distribution control unit is started. And according to the direction to be detected, a horizontal/vertical light intensity distribution detection unit is selected on a software interface, an interpolation motion label is selected, and the translation stage is controlled and started to move. The operations were performed in the order of L (0 ° ) → L (-15 °, 0 °) → L (-10 °, +10 °) → L (0 °, +10 °) → L (+10 ° ) → L (+15 °, 0 °). When the translation table drives the light intensity detector to operate to the position of the point to be measured, the image acquisition unit is used for acquiring the corresponding light intensity of the signal lamp. The luminous intensity of the signal lamp under each position coordinate is collected respectively, data are stored once, and complete light intensity measurement data are displayed after 6 groups of data are collected and stored.
The light source receiving unit modules are arranged at the positions of the points to be measured with 6 different azimuth angles, the reflectivity of the light source receiving unit modules is less than 5%, and the purpose is to eliminate stray light caused by background reflection and the like.
In the process of acquiring data by the light intensity distribution control unit, the monitoring unit acquires continuous signals through the detector, monitors the stability of the signal lamp to be measured, acquires data every 0.5 minute, completes the process to be measured, obtains light intensity instability data of the signal lamp in the data acquisition process, and corrects the light intensity distribution data through software calculation.
Has the advantages that: compared with the prior art, the invention provides the device for measuring the luminous intensity distribution of the detector running with the signal lamp still. The device eliminates the measurement errors caused by the problems of the change of the rotary ignition attitude of the signal lamp, the misalignment of the rotating shaft space, the deformation of the filament, the instability of the luminous intensity in the measurement process, the angle error caused by the turntable for placing the light source and the like.
Has the following advantages:
advantage 1: the traditional method for measuring the light intensity distribution characteristics of the road traffic signal lamp mainly adopts a fixed detector method, a detector is fixed at the zero position of a center, the road traffic signal lamp is installed on a rotary table, the angle of the signal lamp is changed by rotating (including non-horizontal rotation) the rotary table, and the detector positioned at the center is irradiated, so that light intensity data under different angle distributions are approximately obtained. The defects of the method are measurement errors caused by problems of change of the rotary ignition attitude of the signal lamp, misalignment of rotating shaft space, filament deformation, instability of a light source in the measurement process, angle errors caused by non-horizontal rotation of a rotary table for placing the light source and the like.
Advantage 2: the problem of light intensity measurement error caused by rotating the lamp is solved. Original measuring device is simultaneously because the detector position is fixed, the mode of rotatory signal lamp angle, and the signal lamp is rotatory on non-horizontal direction can change the ignition gesture of lamp, and the change of ignition gesture can lead to the thermal balance of signal lamp light source to be destroyed, and thermal balance is destroyed and can arouse the change of temperature, and then leads to the luminous efficacy and the luminous intensity of LED or halogen lamp to change, finally introduces great measuring error.
Advantage 3: the angle error caused by a turntable for placing a light source and the measurement error caused by the spatial misalignment of a rotating shaft are eliminated. The signal lamp is composed of a light source and a face cover. The problem that the rotating shaft of the signal lamp is difficult to determine exists by adopting a signal lamp rotation measuring mode; secondly, the rotating shaft of the lamp and the rotating shaft of the rotary table are coaxial, so that accurate measurement can be realized. However, both axes of rotation are not spatially visible, so that coaxiality is difficult to achieve and large measurement errors are introduced.
Advantage 4: and the introduced monitoring detector corrects the measurement result. Therefore, the light-emitting instability of the signal lamp in the measuring process and errors brought to the light intensity distribution measuring result are eliminated.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Detailed Description
The present invention is further illustrated by the following examples, which are intended to be purely exemplary and are not intended to limit the scope of the invention, as various equivalent modifications of the invention will occur to those skilled in the art upon reading the present disclosure and fall within the scope of the appended claims.
The calibration device for measuring the light intensity distribution characteristics of the road traffic signal lamp comprises an initial position positioning unit, a light source receiving unit, a light intensity distribution control unit and a calibration unit.
In the traditional process of measuring the light intensity distribution characteristics of the road traffic signal lamp, (1) the rotation of the signal lamp in the non-horizontal direction can change the ignition gesture of the lamp, the change of the ignition gesture can cause the thermal balance of a light source of the signal lamp to be damaged, the thermal balance is damaged to cause the change of temperature, and then the luminous efficacy and luminous intensity of the LED or halogen lamp are changed, and finally, a larger measurement error is introduced.
(2) The signal lamp is composed of a light source and a face cover. The problem that the rotating shaft of the signal lamp is difficult to determine exists by adopting a signal lamp rotation measuring mode; secondly, the rotating shaft of the lamp and the rotating shaft of the rotary table are coaxial, so that accurate measurement can be realized. However, both axes of rotation are not spatially visible, so that coaxiality is difficult to achieve and large measurement errors are introduced.
(3) The light emitting of the lamp product is not absolutely stable, the error caused by the stability is not only related to the type of the lamp, but also the individual lamps of the same manufacturer, the same model and the same batch have the difference of the light emitting stability. Therefore, the stability of the signal lighting introduces certain measurement errors.
(4) When the incandescent lamp and the low-voltage halogen lamp rotate in a non-horizontal mode, the filament of the incandescent lamp and the low-voltage halogen lamp can deform slightly under the action of gravity, and changes of light intensity values can be caused, so that certain measuring errors are introduced.
The light intensity distribution control unit designed by the device adopts a signal lamp to keep static, the detector translates to a detection position specified in national standard through a guide rail, and a grating ruler is installed to perform position closed loop feedback, so that the measurement precision is improved.
Initial position locating unit: the device comprises an industrial camera, a level, a reference object, a laser and a cross demarcation device; the reference object is arranged at the top end of the signal lamp, mechanical alignment is carried out through the level gauge, the reference object at the top end of the signal lamp is overlapped with the center of the cross reticle on the light source receiving unit, and the horizontal azimuth angle of the signal lamp is consistent with the horizontal azimuth angle of the light source receiving unit through the cross reticle projector. The geometric center position of the spot generated by the signal lamp on the light source receiving unit is determined by the level and the crosshair plotter as a reference position coordinate L (0 ° ). And setting a position point which is 5 degrees below the geometric center of the light spot as a measurement zero point, wherein the initial position and the termination position are both set at the measurement zero point.
A light source receiving unit: the design is carried out according to the requirement of national standards on the measurement position, as shown in fig. 1, the measurement device consists of six modules, in order to avoid stray light caused by specular reflection, a diffuse reflection material with good cosine characteristics is adopted, and the reflectivity is less than 5%.
A light intensity distribution control unit: the device consists of a translation table and a light intensity detector with indication error superior to 1%, wherein a support is processed to install a light intensity detector group on the translation table and is fixed by screws.
And (4) lighting a signal lamp, and starting an initial position positioning unit for completing the determination and collection of the measurement zero point of the light intensity detector. The method comprises the following steps: the geometric center position of a light spot generated by a signal lamp on a light source receiving unit is determined by a level gauge and a cross-shaped line projector. And a position point located 5 degrees right below the geometric center of the light spot is set as a measurement zero point, such as the position of 0 point in fig. 1. And respectively installing reflective marks on the surfaces of the measurement zero point and the shading cover of the light intensity detector, calculating by using an industrial camera and software, acquiring position coordinates of the measurement zero point and the light intensity detector on the CCD image surface, starting the translation table to move, and moving the light intensity detector to the measurement zero point.
The light shielding cover is removed and the light intensity distribution control unit is started. And according to the direction to be detected, a horizontal/vertical light intensity distribution detection unit is selected on a software interface, an interpolation motion label is selected, and the translation stage is controlled and started to move. As shown in fig. 1, the operation is performed in the order of L (0 ° ) → L (-15 °, 0 °) → L (-10 °, +10 °) → L (0 °, +10 °) → L (+10 ° ) → L (+15 °, 0 °) (1-6 dot positions). When the translation table drives the light intensity detector to operate to the position of the point to be measured, the image acquisition unit is utilized to acquire the corresponding light intensity of the signal lamp. The luminous intensity of the signal lamp under each position coordinate is collected respectively, data are stored once, and complete light intensity measurement data are displayed after 6 groups of data are collected and stored.
Controlling the translation stage: the motion method is classified into two cases, i.e., linear motion and linear interpolation motion. In each case, variable parameters such as initial speed, maximum speed, acceleration, moving distance and the like are set respectively.
An image acquisition unit: for loading the images acquired by the industrial camera. And opening an image acquisition interface of the industrial camera, and storing the image when the image to be displayed meets the requirement.
A monitoring unit: and eliminating the instability error of the light source, the light intensity error in the light intensity distribution control unit and the cosine error in a calculation mode by software.
Claims (10)
1. A calibrating device for road traffic signal lamp light intensity distribution characteristic measurement which characterized in that: the device comprises an initial position positioning unit, a light source receiving unit, a light intensity distribution control unit and a monitoring unit; lighting a signal lamp, starting the initial position positioning unit, and determining and collecting a measurement zero point of the light intensity distribution control unit on the light source receiving unit; starting a light intensity distribution control unit, moving the light intensity distribution control unit to the position of a point to be detected of a light source receiving unit, and acquiring corresponding light intensity data of a signal lamp at the position of the point to be detected by using an image acquisition unit; in the process of collecting light intensity data, the monitoring unit collects stability data of the signal lamp and corrects the light intensity distribution data.
2. The calibration device for measuring the light intensity distribution characteristic of a road traffic signal lamp according to claim 1, wherein: the initial position positioning unit: the device comprises an industrial camera, a level, a reference object, a laser and a cross demarcation device; the reference object is arranged at the top end of the signal lamp, mechanical alignment is carried out through the level gauge, the reference object at the top end of the signal lamp is overlapped with the center of the cross reticle on the light source receiving unit, and the horizontal azimuth angle of the signal lamp is consistent with the horizontal azimuth angle of the light source receiving unit through the cross reticle; the geometric center position of the light spot generated by the signal lamp on the light source receiving unit is determined through the level gauge and the crosshair projector.
3. The calibration device for measuring the light intensity distribution characteristic of a road traffic signal lamp according to claim 2, wherein: the cross-shaped line projector enables the horizontal azimuth angle of the signal lamp to be consistent with the horizontal azimuth angle of the light source receiving unit.
4. The calibration device for measuring the light intensity distribution characteristic of a road traffic signal according to claim 1, wherein: the light source receiving unit: the device is designed according to the requirements of national standards on measuring positions and consists of six light source receiving modules.
5. The calibration device for measuring the light intensity distribution characteristic of a road traffic signal lamp according to claim 2, wherein: setting a position point which is 5 degrees under the geometric center of the light spot as a measurement zero point; and respectively installing reflective marks on the surfaces of the light shading cover of the light intensity detector and the measuring zero point to obtain position coordinates of the light intensity detector and the measuring zero point on the CCD image surface, starting the translation table to move, and moving the light intensity detector to the measuring zero point.
6. The calibration device for measuring the light intensity distribution characteristic of a road traffic signal lamp according to claim 1, wherein: the light intensity distribution control unit: comprises a translation stage and a light intensity detector; the light intensity detector is arranged on the translation table;
lighting a signal lamp, and acquiring the position coordinates of the geometric center position of a light spot generated by the signal lamp on a light source receiving unit on a CCD image surface; acquiring an initial position of a light intensity detector; removing a light shielding cover of the detector, starting the translation table to move, moving the light intensity meter detector to the geometric center position of a light spot generated by the signal lamp on the light source receiving unit to serve as a reference position coordinate L (0 degrees and 0 degrees), and recording the luminous intensity;
according to the direction to be detected, selecting a horizontal or vertical light intensity distribution detection unit, selecting an interpolation motion label, controlling and starting the motion of the translation table, and operating according to the sequence of L (0 degrees, 0 degrees → L (-15 degrees, 0 degrees → L (-10 degrees, +10 degrees → L (0 degrees, +10 degrees → L (+10 degrees, +10 degrees → L (+15 degrees, 0 degrees)); when the translation table drives the light intensity detector to operate to the position of the point to be measured, the image acquisition unit is used for acquiring the corresponding light intensity of the signal lamp; the luminous intensity of the signal lamp under each position coordinate is collected respectively, data are stored once, and complete light intensity measurement data are displayed after 6 groups of data are collected and stored.
7. The calibration device for measuring the light intensity distribution characteristic of a road traffic signal lamp according to claim 6, wherein: the indication error of the light intensity detector is better than 1%.
8. The calibration device for measuring the light intensity distribution characteristic of a road traffic signal lamp according to claim 6, wherein: the translation stage is divided into two conditions of linear motion and linear interpolation motion according to the motion mode; in each case, variable parameters of initial speed, maximum speed, acceleration and moving distance are set.
9. The calibration device for measuring the light intensity distribution characteristic of a road traffic signal lamp according to claim 2, wherein: the image acquisition unit: used for loading the image collected by the industrial camera; and opening an image acquisition interface of the industrial camera, and storing the image when the image to be displayed meets the requirement.
10. The calibration device for measuring the light intensity distribution characteristic of a road traffic signal lamp according to claim 1, wherein: the monitoring unit: in the process of acquiring data by the light intensity distribution control unit, the monitoring unit acquires continuous signals through the detector, monitors the stability of the signal lamp to be measured, acquires data every 0.5 minute, completes the process to be measured, obtains light intensity instability data of the signal lamp in the data acquisition process, and corrects the light intensity distribution data through software calculation; and eliminating the instability error of the light source, the light intensity error in the light intensity distribution control unit and the cosine error in a calculation mode by software.
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