CN112986187A - Device and method for carrying retroreflection magnitude by lambertian body - Google Patents
Device and method for carrying retroreflection magnitude by lambertian body Download PDFInfo
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Abstract
A device and a method for carrying retroreflection magnitude by a Lambertian body belong to the field of traffic safety. The device comprises a measuring radiation source, a spectrum sensor, a space regulator, a bidirectional positioner and a two-dimensional aligner. The spectrum sensor is used for collecting spectrum data of a measuring radiation source and spectrum data of reflected light of the lambertian body, and respectively calculating and regulating a correlated color temperature and a retroreflection magnitude curve of the measured lambertian body under different poses and angle combinations. This patent has utilized the spectral data of measuring radiation source itself and the spectral data's after being reflected by the lambertian body change, obtains the retroreflection quantity value that the lambertian body bore. This patent has carried out automatically regulated to the correlated color temperature of measuring the radiation source to guarantee the accuracy of measuring result at every turn. This patent uses lambertian body to bear contrary reflective quantity value for contrary reflective quantity value can be preserved for a long time through stable lambertian body.
Description
Technical Field
A device and a method for carrying retroreflection magnitude by a Lambertian body belong to the field of traffic safety.
Background
Traffic safety facilities: mainly comprises a reflective film, a traffic sign, a marking line, a raised road sign, a spike, a contour mark and an induction mark.
Retroreflection value: mainly comprises a retroreflection coefficient, a retroreflection brightness coefficient, a luminous intensity coefficient and the like.
Retroreflection measuring instrument: the measuring instrument mainly comprises a retroreflection mark measuring instrument, a retroreflection mark measuring instrument and a raised road sign measuring instrument.
A retro-reflective standard: mainly comprising signs, marked lines or raised road signs bearing traceable quantities.
Standard substance: carrying a traceable amount of material.
2856K: a standard value, corresponding to the color temperature of CIE standard illuminant a, can be achieved by adjusting the voltage and current.
Photopic function: a recognized function determined by CIE at home and abroad was initially calculated by finding several people to observe the same batch of objects. The instrument is adjusted when leaving factory, so that the matching degree of the instrument and the photopic vision function is within 7 percent.
The number of deaths in traffic accidents has increased in recent years. Statistical data show that the probability of the traffic safety facilities with the retroreflection function and the pedestrian wearing and the traffic accident is 70%. Since the first traffic signs made of retroreflective material were introduced in the united states in 1937, road traffic safety facilities were spotlighted by the great effectiveness of night safety by virtue of their unique retroreflective properties. The traffic accident rate can be greatly reduced by the bright traffic sign lines, wearing clothes and the like. Road traffic safety facilities are designed to give road traffic guidance and to give road traffic guidance by visually recognizing information such as the shape, color, character, and pattern of the road traffic safety facilities by a driver. The road traffic safety facilities mainly comprise road traffic signs, road traffic marking lines, raised road signs and the like, the light reflection principle is based on a retroreflection material which is an optical material with a special structure and can retroreflect light back to a light source, and the main measuring equipment is a retroreflection measuring instrument. The testing principle of retro-reflective gauges is an alternative, relying on standard substances with retro-reflective values.
There is no disclosure of a device and method for using lambertian bodies to carry retroreflective magnitude values, and retroreflective bodies are generally used to carry retroreflective magnitude values. The corresponding devices are retro-reflective measuring standard devices or retro-reflective standards, and the corresponding methods are ratio method, direct luminous intensity method, direct brightness method, and alternative method.
The prior art has the following disadvantages: 1) the retro-reflector has a short lifetime and a large annual variation. 2) Retroreflectors have poor uniformity.
Disclosure of Invention
The device for carrying the retroreflection magnitude by the lambertian body comprises a measuring radiation source, a spectrum sensor, a space regulator, a two-way positioner and a two-dimensional aligner, and a hardware connection diagram is shown in figure 1.
The outer frame 4 is 1 closed cube, the black inside the outer frame is not reflective, external light cannot enter the inside of the outer frame, and the bottom and two sides of the outer frame can be detached when the measured Lambert body is installed; the outer frame is provided with a two-dimensional aligner, and the long edge of the two-dimensional aligner is parallel to the long edge of the upper part of the outer frame; the two-dimensional aligner 5 is provided with a measuring cabinet body 3, a two-way positioner 10 and a placing cabinet body 6; a driving controller 2 is arranged on the measuring cabinet body, a measuring radiation source is arranged on the driving controller, and a diaphragm with adjustable size is arranged at the end part of the right side of the measuring radiation source 1; the driving controller can provide controllable stable voltage and current to drive the measuring radiation source to emit radiation light; the driving controller can receive the spectrum data output by the spectrum sensor; a spectrum sensor is arranged on the bidirectional positioner, and a light sensing surface of the spectrum sensor is vertical to the long edge of the two-dimensional aligner; the bidirectional positioner can control the spectrum sensor, so that the distance between the center of the photosensitive surface of the spectrum sensor and the center of the measuring radiation source is continuously adjustable, and the photosensitive surface of the spectrum sensor and the diaphragm of the measuring radiation source are positioned in the same plane; the bidirectional positioner can control the spectrum sensor 9 to move the spectrum sensor to the right, the photosensitive surface of the spectrum sensor is aligned with the measuring radiation source, the measuring axis passes through the center of the photosensitive surface of the spectrum sensor and the center of the measuring radiation source, and the positioning laser is intersected with the photosensitive surface of the spectrum sensor; a positioning laser and a space adjuster are arranged on the placing cabinet body; the measured Lambertian body is fixed on the space adjuster, so that the measured Lambertian body can rotate along with the space adjuster; the central point of the rotation of the spatial regulator is on the axis of the positioning laser, and the spatial regulator 7 can move to make the central line of the measured Lambertian body coincide with the axis of the positioning laser; the central axis of the measuring radiation source diaphragm is parallel to the long edge of the two-dimensional aligner and passes through the middle point of the measured Lambert body 8; the measuring axis 11 is parallel to the long side of the upper part of the outer frame and is vertical to the sidelines of the left side and the right side of the outer frame.
The device for bearing retroreflection magnitude by the lambertian body consists of a measuring radiation source, a spectrum sensor, a space regulator, a bidirectional positioner, a two-dimensional aligner and the like.
In fig. 3, cs is the initial position or the lower position of the spectrum sensor, and gw is the initial position or the homing state of the measured lambertian body.
In fig. 4, tw is that the measured lambertian body is in a retreating state, and sw is that the spectrum sensor is in an upper state.
The overall technical scheme is realized as follows:
(1) the bottom and two sides of the outer frame are detached, the lambertian body to be measured is arranged on the space adjuster, and the bottom and two sides of the outer frame are arranged.
(2) The device is powered up so that the components preheat.
(3) The driving controller outputs initial voltage and current, lights the measuring radiation source, and waits for the measuring radiation source to stably emit radiation.
(4) As shown in fig. 4, the spatial adjuster drives the measured lambertian body to move vertically downward and deviate from the initial position (the initial position is gw in fig. 3), so that the measured lambertian body is completely unable to be irradiated by the light emitted by the measured radiation source, and the center of the photosensitive surface of the spectrum sensor can be penetrated by the measured axis after the spectrum sensor descends, i.e. the measured lambertian body is in a retreated state (tw in fig. 4).
(5) The spectrum sensor starts to measure and record the stray light in the outer frame.
(6) The spectrum sensor moves towards the placing cabinet body under the driving of the two-way positioner, firstly moves towards the right side along the two-dimensional aligner, when the spectrum sensor moves to the position right above a measured Lambert body, the two-way positioner moves downwards, the spectrum sensor is rotated, the photosensitive surface of the spectrum sensor faces towards the plane where the measuring radiation source is located, the center of the photosensitive surface of the spectrum sensor and the center of the measuring radiation source are located on the same horizontal line, namely, the measured axis passes through simultaneously, the position where the laser and the photosensitive surface of the spectrum sensor are intersected is located, the photosensitive surface of the spectrum sensor faces towards the direction opposite to the irradiation direction of the measuring radiation source, namely, the spectrum sensor is in a sw state.
(7) The spectrum sensor collects the spectrum data of the measuring radiation source and calculates to obtain the correlated color temperature.
(8) And if the correlated color temperature of the measuring radiation source does not meet the requirement, the driving controller changes the voltage and the current, so that the correlated color temperature of the measuring radiation source changes. When the correlated color temperature of the measuring radiation source is too low, the output voltage and current value of the driving controller is increased; when the correlated color temperature of the measuring radiation source is too high, the output voltage current value of the driving controller is turned down. The correlated color temperature requirement is 2856K.
(9) When the correlated color temperature of the measuring radiation source meets the requirements, the spectrum sensor collects the spectrum DATA DATA1 and transmits the DATA to the drive controller.
(10) As shown in cs in fig. 3, the spectrum sensor moves to the lower position, i.e., moves toward the measurement cabinet under the driving of the two-way positioner, so that the photosensitive surface of the spectrum sensor and the diaphragm of the measurement radiation source are in the same plane, and the photosensitive surface of the spectrum sensor faces in the same direction as the irradiation direction of the measurement radiation source.
(11) The lambertian body to be measured is returned under the driving of the space adjuster, as shown in gw of fig. 3, so that the laser emitted by the positioning laser coincides with the center line of the lambertian body to be measured, and the included angle between the long side of the lambertian body to be measured and the horizontal direction is set to be beta.
(12) And b is set as the distance between the midpoint of the diaphragm of the measuring radiation source and the midpoint of the measured Lambert body, and the distance L between the center of the photosensitive surface of the spectrum sensor and the center of the measuring radiation source meets the following requirements under the drive of the bidirectional positioner: and tan theta is equal to b/L, wherein theta is an included angle between a connecting line from the center of the photosensitive surface of the spectrum sensor to the center of the measured Lambert body and a connecting line from the middle point of the diaphragm of the measuring radiation source to the center of the measured Lambert body.
(13) The space adjuster is initialized, so that the long side of the measured lambertian body is parallel to the horizontal direction.
(14) Under the drive of the space regulator, the variation range of the included angle beta between the long side of the lambertian body to be measured and the horizontal direction is (-180 degrees).
(15) B is adjusted correspondingly so that the variation range of theta is (0 DEG to 90 deg).
(16) The spectrum sensor continuously collects the spectrum DATA 2.
(17) After traversing all the angle combinations of the beta and the theta, calculating to obtain a retroreflection magnitude curve of the measured Lambert body, wherein the calculating method comprises the following steps: multiplying DATA1 by a photopic function of the spectrum sensor, and then integrating in a corresponding wavelength range to obtain total flux D1 in the corresponding wavelength range; multiplying DATA2 by a photopic function of the spectrum sensor, and then integrating in a corresponding wavelength range to obtain total flux D2 in the corresponding wavelength range; and dividing the total flux D2 by the total flux D1, multiplying the total flux by the correction number k to obtain a retroreflection magnitude curve corresponding to beta and theta, and drawing to obtain a retroreflection magnitude three-dimensional graph by taking beta as an x axis and theta as a y axis and taking the retroreflection magnitude obtained by calculation as a z axis. When the design value of the measurement area of the instrument used with the standard substance is s1 and the effective area of the standard substance is s2, k is (L × s1)/(s2 × s2 × cos (β -1.05 °)). Wherein 1.05 degrees is the observation angle of the retroreflection measuring instrument using the lambertian body, and beta is the included angle between the long side of the measured lambertian body and the horizontal direction. s1 is given by the instruction of the instrument used with the standard substance, that is, when the instrument used with the standard substance is used for measuring the road traffic marking, the spot area of the illumination beam irradiated on the measured road traffic marking is provided. S2 is the spot area of the standard substance irradiated by the illumination beam when the standard substance is used for calibration.
s1 and s2 can be measured using a vernier caliper or the like.
This patent has realized that it is automatic to bear contrary reflective quantity value to lambertian body.
This patent has fabulous suitability, can bear multiple traffic safety facility luminosity performance such as contrary reflection coefficient, contrary reflection luminance coefficient, luminous intensity coefficient on lambert's body.
The cost of the method is lower than that of the conventional method.
Drawings
FIG. 1 is a schematic diagram of hardware connection of a device for carrying retroreflection magnitude by Lambertian
In fig. 1, 1 is a measuring radiation source, 1-1 is a diaphragm of the measuring radiation source, 2 is a driving controller, 3 is a measuring cabinet, 4 is an outer frame, 5 is a two-dimensional aligner, 6 is a placing cabinet, 7 is a space adjuster, 8 is a measured lambertian body, 9 is a spectrum sensor, 9-1 is a photosensitive surface on the spectrum sensor, 10 is a bidirectional positioner, 11 is a measuring axis, a is a positioning laser, b is a distance between a midpoint of the diaphragm of the measuring radiation source and a midpoint of the measured lambertian body, β is an included angle between a long side of the measured lambertian body and a horizontal direction, β changes along with the rotation of the measured lambertian body, and L is a distance between a center of the photosensitive surface of the spectrum sensor and a center of the measuring radiation source. cs is that the spectrum sensor is in an initial position or a lower position state, and gw is that the measured Lambert body is in the initial position or a homing state. The device can work as shown in figure 1, and can also work by rotating the device by +/-90 degrees.
FIG. 2 is a schematic diagram of the hardware connection of the device for carrying retroreflection magnitude by Lambertian
FIG. 3 is a flow chart of a method and apparatus for supporting retroreflection magnitude with lambertian bodies
FIG. 4 is a schematic view of the position of FIG. 1
FIG. 5 is a schematic view of the position of FIG. 2
Detailed Description
(1) The bottom and both sides of the outer frame were disassembled, the white mean ceramic plate was mounted on the space adjuster, and the bottom and both sides of the outer frame were mounted.
(2) The device is powered up so that the components preheat.
(3) The driving controller outputs initial voltage and current, lights the measuring radiation source, and waits for the measuring radiation source to stably emit radiation.
(4) The space adjuster drives the measured white mean ceramic plate to deviate from the initial position.
(5) The spectrum sensor starts to measure and record the stray light in the outer frame.
(6) The spectrum sensor is driven by the bidirectional positioner to move towards the placing cabinet body, the photosensitive surface of the spectrum sensor is aligned to the measuring radiation source, the center of the photosensitive surface of the spectrum sensor and the center of the measuring radiation source are positioned on the same horizontal line, and the positioning laser is intersected with the photosensitive surface of the spectrum sensor.
(7) The spectrum sensor collects the spectrum data of the measuring radiation source and calculates to obtain the correlated color temperature.
(8) And if the phase difference between the correlated color temperature of the measuring radiation source and the designed color temperature exceeds 6K, the driving controller changes the voltage and the current, so that the correlated color temperature of the measuring radiation source changes. When the correlated color temperature of the measured radiation source is smaller than the design color temperature, the output voltage and current value of the driving controller is increased; when the correlated color temperature of the measuring radiation source is higher than the design color temperature, the output voltage current value of the driving controller is turned down.
(9) When the difference between the correlated color temperature of the measuring radiation source and the design color temperature is not more than 6K, the spectrum sensor collects the radiation source spectrum DATA DATA1 and transmits the radiation source spectrum DATA DATA1 to the driving controller.
(10) The spectrum sensor is reset and moves towards the measuring cabinet under the drive of the bidirectional positioner, so that the photosensitive surface of the spectrum sensor and the diaphragm of the measuring radiation source are in the same plane.
(11) The measured white mean ceramic plate is reset under the driving of the space regulator, so that the laser emitted by the positioning laser coincides with the central line of the measured white mean ceramic plate, and the included angle between the long edge of the measured white mean ceramic plate and the horizontal direction is recorded as beta.
(12) And setting the distance from the midpoint of the diaphragm of the measuring radiation source to the midpoint of the measured white mean value ceramic plate as b, and enabling the distance L between the center of the photosensitive surface of the spectrum sensor and the center of the measuring radiation source to meet the following requirements under the drive of the bidirectional positioner: and b/L is tan1.05 degrees, wherein 1.05 degrees is an included angle between a connecting line from the center of a photosensitive surface of the spectrum sensor to the center of the measured white mean value ceramic plate and a connecting line from the middle point of a diaphragm of the measuring radiation source to the center of the measured white mean value ceramic plate.
(13) The spatial adjuster was initialized so that the long side of the measured white mean ceramic plate was parallel to the horizontal.
(14) Under the drive of the space regulator, the variation range of the included angle beta between the long edge of the measured white mean ceramic plate and the horizontal direction is (80-90 degrees).
(15) The spectrum sensor continuously collects the spectrum DATA 2.
(16) Calculating to obtain a retroreflection value curve of the measured white mean value ceramic plate, wherein the calculating method comprises the following steps: multiplying DATA1 by a photopic function of the spectrum sensor, and then calculating an integral in a wavelength range of 380 nm-780 nm to obtain total flux D1 in the wavelength range of 380 nm-780 nm; multiplying DATA2 by a photopic function of the spectrum sensor, and then integrating in a wavelength range of 380 nm-780 nm to obtain total flux D2 in the wavelength range of 380 nm-780 nm; the total flux D2 is divided by the total flux D1, and the product is multiplied by the correction number k to obtain the retroreflection brightness coefficient of the white mean value ceramic plate.
This patent has utilized the spectral data of measuring radiation source itself and the spectral data's after being reflected by the lambertian body change, obtains the retroreflection quantity value that the lambertian body bore.
This patent has carried out automatically regulated to the correlated color temperature of measuring the radiation source to guarantee the accuracy of measuring result at every turn.
This patent uses lambertian body to bear contrary reflective quantity value for contrary reflective quantity value can be preserved for a long time through stable lambertian body.
The automatic adjustment of the correlated color temperature of the measuring radiation source is realized, in particular to that (7) the spectrum sensor acquires the spectrum data of the measuring radiation source and then calculates to obtain the correlated color temperature, and the process of fast convergence is difficult to realize if the controller is driven to change the voltage current to adjust the correlated color temperature.
The retro-reflection performance of the lambertian body is very weak, a common method, such as using an illuminometer and the like, cannot receive a weak signal, and the method provided by the patent solves the sensing problem of the weak signal from the perspective of total luminous flux.
Claims (2)
1. The lambertian body bears device against reflection magnitude value, its characterized in that:
the device comprises a measuring radiation source, a spectrum sensor, a space regulator, a bidirectional positioner and a two-dimensional aligner; the outer frame is 1 closed cube; the outer frame is provided with a two-dimensional aligner, and the long edge of the two-dimensional aligner is parallel to the long edge of the upper part of the outer frame; the two-dimensional aligner is provided with a measuring cabinet body, a two-way positioner and a placing cabinet body; a driving controller is arranged on the measuring cabinet body, a measuring radiation source is arranged on the driving controller, and a diaphragm with adjustable size is arranged at the end part of the right side of the measuring radiation source; the driving controller provides controllable stable voltage and current to drive the measuring radiation source to emit radiation light; the driving controller receives the spectrum data output by the spectrum sensor; a spectrum sensor is arranged on the bidirectional positioner, and a light sensing surface of the spectrum sensor is vertical to the long edge of the two-dimensional aligner;
the bidirectional positioner can control the spectrum sensor, so that the distance between the center of the photosensitive surface of the spectrum sensor and the center of the measuring radiation source is continuously adjustable, and the photosensitive surface of the spectrum sensor and the diaphragm of the measuring radiation source are positioned in the same plane; the bidirectional positioner can control the spectrum sensor to move the spectrum sensor to the right side, the photosensitive surface of the spectrum sensor is aligned to the measuring radiation source, the measuring axis passes through the center of the photosensitive surface of the spectrum sensor and the center of the measuring radiation source, and the positioning laser is intersected with the photosensitive surface of the spectrum sensor;
a positioning laser and a space adjuster are arranged on the placing cabinet body; the measured Lambertian body is fixed on the space adjuster, so that the measured Lambertian body can rotate along with the space adjuster; the rotating central point of the spatial adjuster is on the axis of the positioning laser, and the spatial adjuster can move to enable the central line of the measured Lambert body to be coincident with the axis of the positioning laser; the central axis of the measuring radiation source diaphragm is parallel to the long edge of the two-dimensional aligner and passes through the midpoint of the measured Lambert body; the measuring axis is parallel to the long edge of the upper part of the outer frame and is vertical to the sidelines of the left side and the right side of the outer frame.
2. A method for applying the apparatus of claim 1, wherein:
(1) the bottom and two sides of the outer frame are detached, the lambertian body to be measured is arranged on the space adjuster, and the bottom and two sides of the outer frame are arranged;
(2) powering on the device to preheat each part;
(3) the driving controller outputs initial voltage and current, lights the measuring radiation source, and waits for the measuring radiation source to stably emit radiation;
(4) the space adjuster drives the measured Lambert body to move vertically downwards, so that the measured Lambert body can not be irradiated by light emitted by the measured radiation source, and the center of the photosurface of the spectrum sensor can pass through by the measured axis after the spectrum sensor descends;
(5) the spectrum sensor starts to measure and records the stray light in the outer frame;
(6) the spectrum sensor moves towards the placing cabinet body under the driving of the two-way positioner, firstly moves towards the right side along the two-dimensional aligner, when the spectrum sensor moves to be right above a measured Lambert body, the two-way positioner moves downwards and rotates the spectrum sensor, so that the photosensitive surface of the spectrum sensor faces towards the plane where the measuring radiation source is located, the center of the photosensitive surface of the spectrum sensor and the center of the measuring radiation source are located on the same horizontal line, namely, the measured axis passes through simultaneously, the position where the laser and the photosensitive surface of the spectrum sensor are intersected is located, and the photosensitive surface of the spectrum sensor faces towards the direction opposite to the irradiation direction of the measuring radiation source;
(7) the spectrum sensor collects the spectrum data of the measuring radiation source and calculates to obtain the correlated color temperature;
(8) if the correlated color temperature of the measuring radiation source does not meet the requirement, the driving controller changes the voltage and the current, so that the correlated color temperature of the measuring radiation source changes; when the correlated color temperature of the measuring radiation source is too low, the output voltage and current value of the driving controller is increased; when the correlated color temperature of the radiation source is measured to be too high, the output voltage and current value of the driving controller is reduced;
(9) when the correlated color temperature of the measuring radiation source meets the requirement, the spectrum sensor collects the spectrum DATA DATA1 and transmits the DATA to the driving controller; the correlated color temperature requirement is 2856K;
(10) the spectrum sensor moves towards the measuring cabinet under the drive of the bidirectional positioner, so that the photosensitive surface of the spectrum sensor and the diaphragm of the measuring radiation source are positioned on the same plane, and the photosensitive surface of the spectrum sensor faces to the direction consistent with the irradiation direction of the measuring radiation source;
(11) the measured Lambert body is returned under the driving of the space regulator, so that the laser emitted by the positioning laser is superposed with the central line of the measured Lambert body, and the included angle between the long edge of the measured Lambert body and the horizontal direction is set as beta;
(12) and b is set as the distance between the midpoint of the diaphragm of the measuring radiation source and the midpoint of the measured Lambert body, and the distance L between the center of the photosensitive surface of the spectrum sensor and the center of the measuring radiation source meets the following requirements under the drive of the bidirectional positioner: the tan theta is an included angle between a connecting line from the center of a photosensitive surface of the spectrum sensor to the center of the measured Lambert body and a connecting line from the middle point of a diaphragm of the measuring radiation source to the center of the measured Lambert body;
(13) initializing a space adjuster to enable the long side of the measured Lambert body to be parallel to the horizontal direction;
(14) under the drive of the space regulator, the variation range of the included angle beta between the long side of the measured Lambert body and the horizontal direction is (-180 degrees);
(15) correspondingly adjusting b to enable the variation range of theta to be (0-90 degrees);
(16) the spectrum sensor continuously collects spectrum DATA DATA 2;
(17) after traversing all the angle combinations of the beta and the theta, calculating to obtain a retroreflection magnitude curve of the measured Lambert body, wherein the calculating method comprises the following steps: multiplying DATA1 by a photopic function of the spectrum sensor, and then integrating in a corresponding wavelength range to obtain total flux D1 in the corresponding wavelength range; multiplying DATA2 by a photopic function of the spectrum sensor, and then integrating in a corresponding wavelength range to obtain total flux D2 in the corresponding wavelength range; dividing the total flux D2 by the total flux D1, multiplying the total flux by a correction number k to obtain a retroreflection magnitude curve corresponding to beta and theta, and drawing to obtain a retroreflection magnitude three-dimensional graph by taking beta as an x axis and theta as a y axis and taking the retroreflection magnitude obtained by calculation as a z axis; when the design value of the measurement area of the instrument used with the standard substance is s1 and the effective area of the standard substance is s2, k is (L × s1)/(s2 × s2 × cos (β -1.05 °)); wherein 1.05 degrees is an observation angle of a retro-reflection measuring instrument using a lambertian body, and beta is an included angle between the long side of the measured lambertian body and the horizontal direction; s1 is given by the instruction of the instrument used with the standard substance, that is, when the instrument used with the standard substance is used for measuring the road traffic marking, the area of the light spot of the illumination beam on the road traffic marking to be measured is irradiated; s2 is the spot area of the standard substance irradiated by the illumination beam when the standard substance is used for calibration.
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| CN114166750A (en) * | 2021-12-07 | 2022-03-11 | 北京中交工程仪器研究所 | Retroreflection luminosity measurement system |
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| CN201716105U (en) * | 2010-06-03 | 2011-01-19 | 交通部公路科学研究所 | Retroreflection brightness coefficient measurement device |
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