Portable on-site measuring instrument for measuring retroreflection characteristic of road marking

Abstract

The utility model relates to a portable on-site measuring instrument for measuring the retroreflection characteristic of a road marking, which comprises a shell, and a power supply, a control circuit board and an optical system which are arranged in the shell, and LED light emitted by an LED light source sequentially passes through a spectroscope, a filter lens and a light in-out window to irradiate a test area. The road marking on the test area carries out retroreflection on the LED light, the retroreflection light passes through the light inlet and outlet window, the filter lens, the spectroscope and the pair of reflectors in sequence and is transmitted to the light sensation receiver, the light sensation receiver samples a signal, the signal is stored and calculated through the control circuit board, and the retroreflection value of the tested object is calculated. The problem that the test deviation value is large under the same standard source is solved through the optimal design of the light source and the light instrument structure; the photoelectric integrated high-precision and high-stability structural design is adopted, rapid detection is supported, results are printed through a built-in printing site, and the device has the advantages of being free of preheating, small in measurement error, capable of being used instantly after being opened and the like.

Description

Technical Field

[0001] This utility model relates to the field of road marking testing technology, specifically to a portable field measuring instrument for measuring the retroreflective characteristics of road markings. Background Technology

[0002] The Open Light Source Instrument is a portable field measuring instrument used to measure the retroreflective characteristics of road markings. This instrument simulates the visibility of road markings to drivers under nighttime vehicle headlight illumination, measuring the nighttime retroreflective luminance coefficient, or RL value. It also tests the luminance coefficient Qd under daylight or road lighting, i.e., diffuse illumination.

[0003] The existing similar instruments have poor consistency and stability of optical components and testing devices, and the main defects are insufficient test stability. When repeatedly testing with the same standard source, the test parameters deviate greatly, and the test deviation is also large when tested under different ambient temperatures.

[0004] The optical components and testing devices of existing similar instruments have unreasonable optical path designs, with many intersections and interferences between incident and reflected rays, resulting in inaccurate measurement values. In addition, existing similar instruments, apart from having an LCD screen, lack other output modules, which cannot meet the requirements of timely printing of measurement data, broadcasting through a voice broadcast module under strong light, and transmitting multiple measurement data to other data processing modules through a data interface. Utility Model Content

[0005] The purpose of this invention is to provide a portable field measuring instrument for measuring the retroreflective characteristics of road markings. It aims to overcome the shortcomings of existing technologies and solve the problems of inaccurate measurement values ​​due to the intersection and interference of incident and reflected light rays, as well as the lack of multiple output modules.

[0006] Therefore, this utility model proposes a portable field measuring instrument for measuring the retroreflective characteristics of road markings, including a housing and a power supply, control circuit board, and optical system disposed inside the housing. A light inlet / outlet window is provided at the lower front end of the housing. The optical system includes an LED light source, a light sensor, a reflector, a beam splitter, and a filter. The LED light source and the light sensor are electrically connected to the power supply.

[0007] The LED light source and the light sensor are installed inside the rear of the housing, with the light sensor located below the LED light source. A pair of parallel reflectors are located in front of the LED light source. The beam splitter and the filter are installed at the bottom center of the housing. The LED light emitted by the LED light source passes sequentially through the beam splitter, the filter, and the light inlet / outlet window to illuminate the test area. The road markings on the test area retroreflect the LED light. The retroreflected light passes sequentially through the light inlet / outlet window, the filter, the beam splitter, and the pair of reflectors to the light sensor. The light sensor samples the signal and then stores and processes it through the control circuit board to calculate the retroreflection value of the object under test.

[0008] As a preferred technical solution of this application, the pair of mirrors arranged in parallel to each other are both at a 45° angle to the horizontal plane.

[0009] As a preferred technical solution of this application, the color temperature of the LED light source is in the range of 2856K+50K to ensure the optical path signal.

[0010] As a preferred technical solution of this application, it also includes a touch screen display, which is electrically connected to the control circuit board and powered by the power supply. The touch screen display displays system information such as detection process prompts, results, and battery level.

[0011] As a preferred technical solution of this application, the touch display screen is a 5.5-inch high-brightness LCD display screen.

[0012] As a preferred technical solution of this application, it also includes a temperature and humidity sensor, which is electrically connected to the control circuit board and powered by a power supply. The temperature and humidity sensor measures the temperature and humidity of the road markings and then displays them on a touch screen.

[0013] As a preferred technical solution of this application, it also includes a voice broadcast module, which is electrically connected to the control circuit board and powered by the power supply, and is used to broadcast measurement data.

[0014] As a preferred technical solution of this application, a portable printer is also included. The portable printer is installed at the rear end of the housing, electrically connected to the control circuit board and powered by a power supply, and is used to print measurement data.

[0015] As a preferred technical solution of this application, a data interface is provided on the upper part of the housing, and the data interface is electrically connected to the control circuit board.

[0016] As a preferred technical solution of this application, a handle is also provided on the upper part of the housing.

[0017] This utility model provides a portable field measuring instrument for measuring the retroreflective properties of road markings. Through optimized design of the light source and optical instrument structure, it solves the problem of large test deviations under the same standard source. It adopts a high-precision, high-stability optoelectronic integrated structure design. The system utilizes a high-specification MCU main control module, a large-capacity storage unit, a touchscreen display with handwriting input, and embedded programmable software. It supports rapid detection and on-site printing of results via built-in printer. It features no preheating required, small measurement error, and immediate usability. This instrument is an essential tool for measuring the retroreflective performance of road markings in production, quality supervision, engineering construction, and supervision units.

[0018] In addition to the purposes, features, and advantages described above, this application has other purposes, features, and advantages. A further detailed description of this application will be provided below with reference to the figures. Attached Figure Description

[0019] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0020] Figure 1 This is a schematic diagram of the portable field measuring instrument for measuring the retroreflective properties of road markings according to this utility model.

[0021] Figure 2 This is a schematic diagram of the portable field measuring instrument for measuring the retroreflective properties of road markings according to this utility model.

[0022] Figure 3 This is a schematic diagram of the optical transmission path in the portable field measuring instrument for measuring the retroreflective properties of road markings according to this utility model.

[0023] Figure 4 This is a schematic diagram of the receiving optical path in the portable field measuring instrument for measuring the retroreflective characteristics of road markings according to this utility model.

[0024] Figure 5 This is the receiving circuit diagram of the portable field measuring instrument for measuring the retroreflective characteristics of road markings according to this utility model;

[0025] Explanation of reference numerals in the attached diagram: 1. Housing; 2. Light inlet / outlet window; 3. Portable printer; 4. Handle; 5. Data interface; 6. Power switch; 7. Touch screen; 8. Light sensor receiver; 9. LED light source; 10. Reflector; 11. Beam splitter; 12. Filter; 13. Power supply; 14. Control circuit board; 15. Test area. Detailed Implementation

[0026] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0027] like Figure 1 As shown, the geometric conditions of the open light source instrument simulate the brightness observed by the driver in the cab when a car is driving on a highway at night, with the car's headlights illuminating the road markings made of retroreflective material.

[0028] The angle between the optical axis of the headlight and the normal (reference axis) of the road surface is called the angle of incidence, which is defined as 88.76°. The angle between the optical axis of the headlight and the retroreflected ray is called the observation angle, which is defined as 1.05°. The light source of the optical system is projected onto the road marking at the angle of incidence. The measuring window is 340×95mm. The light reflected from the road marking is reflected at an observation angle of 1.05° into a filter equipped with V(λ), where it is detected and collected. After being processed, the value is displayed on the measurement display, which is the retroreflection coefficient RL value.

[0029] This utility model discloses a portable field measuring instrument for measuring the retroreflective properties of road markings. It is used to test the retroreflective coefficient of the signboard surface. Under fixed angles, namely observation angle 1.05° and incident angle 88.76°, the brightness value of the signboard is measured. This measured value is also the most critical data of the retroreflective material of the signboard.

[0030] Retroreflective optical systems are a very complex optical structure that requires providing a light source path while also accommodating the light reflected back from the signboard to the light sensor receiver.

[0031] like Figures 2-4 As shown, the portable field measuring instrument for measuring the retroreflective properties of road markings of this utility model includes: a housing 1, a handle 4, and a power supply 13, a control circuit board 14, and an optical system disposed inside the housing 1. The optical system includes an LED light source 9, a light sensor receiver 8, a reflector 10, a beam splitter 11, and a filter 12. The handle 4 is disposed on the upper part of the housing 1.

[0032] Specifically, the LED light source 9 and the light sensor 8 are installed inside the rear of the housing, with the light sensor 8 located below the LED light source 9. A pair of parallel reflectors 10 are located in front of the LED light source 9, and each reflector 10 is at a 45° angle to the horizontal plane. A beam splitter 11 and a filter 12 are installed at the bottom center of the housing 1 to separate the incident light from the retroreflected light. The power supply 13 is electrically connected to the LED light source 9 and the light sensor 8, and the power supply 13 is a high-capacity rechargeable lithium battery.

[0033] The working principle of the optical system is as follows: LED light source 9 emits LED light, which passes through beam splitter 11, filter 12 and light inlet / outlet window 2 in sequence to illuminate test area 15. The road markings on test area 15 retroreflect the LED light. The retroreflected light passes through light inlet / outlet window 2, filter 12 and beam splitter 11 in sequence to illuminate a pair of reflectors 10, which transmit the retroreflected light to the photosensitive receiver 8 below LED light source 9. The photosensitive receiver 8 uses A / D high-speed sampling chip (AD1242) to sample the average value of the signal over a period of time to perform A / D conversion of the test voltage data. Then, through the storage and calculation of the control circuit board 14, the retroreflection value of the tested object is calculated.

[0034] In this scheme, the retroreflective optical system design is based on the national standard for retroreflective measuring instruments (GB / T 26377-2010). It uses warm white LED lights as the light source, and the color temperature is within the range of 2856K+50K, which meets the requirements of standard A light source. The light is reflected, transmitted, and refracted by the beam splitter, reflector, and filter, and is corrected by the light-sensing circuit in a circular diffusion manner.

[0035] Optical Instrument Design: The design adopts the principle of the original retroreflective optical instrument, with adjustments made to the incident and observation angles. An LED light source is used, with a color temperature within the range of 2856K+50K to ensure signal strength in the optical path. Although the optical instrument design is an improvement on the original, adjustments have been made to the optical path angles and direction, and all lenses within the instrument have also been redesigned and adjusted.

[0036] Main circuit design: The reflected signal from the light source is converted into a voltage signal. A fixed-frequency voltage signal is acquired, modulated, and demodulated to filter out the DC component and retain the alternating signal component. An operational amplifier circuit is used for isolation, amplification, filtering, shaping, integration, and sample-and-hold to obtain an equivalent DC bias voltage, which is then sampled by an A / D chip.

[0037] like Figure 5 As shown, the optical instrument uses a TEMD5510FX01 photodiode for sampling, with a typical incident wavelength of λp=550nm. The light source is a modulated sine wave projected onto the test surface of the object under test by the optical instrument. After reflection, the light enters the incident angle optical path and is received by the photodiode, receiving a sinusoidal light signal with a DC component. This signal is then modulated and demodulated, filtering out the DC component and retaining the alternating signal component. The average value of the signal over a period of time is sampled by an A / D high-speed sampling chip (AD1242) for A / D conversion of the test voltage data. Through storage and calculation, the retroreflection value of the object under test is calculated. In this diagram, D3 is the receiving photodiode TEMD5510FX01, IC6 is the operational amplifier AD627, and IC8 is the A / D converter ADS1242.

[0038] like Figure 1 In one embodiment, the portable field measuring instrument for measuring the retroreflective characteristics of road markings further includes a portable printer 3 and a touch screen 7. The portable printer 3 is installed at the rear end of the housing 1. The portable printer 3 and the touch screen 7 are electrically connected to the control circuit board 14 and powered by the power supply 13. The touch screen 7 is a 5.5-inch high-brightness LCD screen with high-brightness LCD display, displaying system information such as detection process prompts, result display, and battery level.

[0039] The operator can control the parameters of the LED light source 9 through the touch screen 7. After the control circuit board 14 calculates the retroreflection value of the object being measured and other measurement data, it is displayed on the touch screen 7 and printed out by the portable printer 3.

[0040] The portable field measuring instrument also includes a voice broadcast module and a temperature and humidity sensor. The voice broadcast module and the temperature and humidity sensor are electrically connected to the control circuit board 14 and powered by the power supply 13. After the control circuit board 14 calculates the retroreflection value of the measured object and other measurement data, it broadcasts them through the voice broadcast module. The temperature and humidity sensor measures the temperature and humidity of the road markings and then displays the real-time temperature and humidity through the touch screen 7.

[0041] In addition, the upper part of the housing 1 of the portable field measuring instrument is also provided with a data interface 5 and a power switch 6. The data interface 5 is electrically connected to the control circuit board 14. The operator can connect a data cable to the data interface 5 to save the data measured by the portable field measuring instrument and transmit it to other control devices for centralized data analysis of the measured values.

[0042] The working process of the portable field measuring instrument for measuring the retroreflective characteristics of road markings is briefly described below.

[0043] LED light source 9 emits LED light, which sequentially passes through beam splitter 11, filter 12, and light inlet / outlet window 2 to illuminate test area 15. Road markings in test area 15 retroreflect the LED light. The retroreflected light then passes through light inlet / outlet window 2, filter 12, and beam splitter 11 to illuminate a pair of reflectors 10, transmitting the retroreflected light to photosensitive receiver 8 below LED light source 9. Photosensitive receiver 8 uses an A / D high-speed sampling chip (AD1242) to sample the signal at an average value over a period of time for A / D conversion of the test voltage data. The retroreflection value of the tested object is then calculated through storage and computation on control circuit board 14. The use of high-precision and low-temperature-drift devices solves the problem of poor test consistency caused by environmental temperature variations.

[0044] The operator can control the parameters of the LED light source 9 via the touch screen 7. After the control circuit board 14 calculates the retroreflection value and other measurement data of the object being measured, it is displayed on the touch screen 7 and printed out simultaneously via the portable printer 3. The touch screen 7 is a 5.5-inch high-brightness LCD display, which displays system information such as detection process prompts, results, and battery level.

[0045] After calculating the retroreflection value and other measurement data of the object being measured, the control circuit board 14 announces the data through the voice broadcast module. The temperature and humidity sensor measures the temperature and humidity of the road markings and displays the real-time temperature and humidity on the touch screen 7. Staff can also connect a data cable to the data interface 5 to save and transmit the data measured by the portable field measuring instrument to other control devices for centralized data analysis of the measured values.

[0046] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A portable field measuring instrument for measuring the retroreflective properties of road markings, characterized in that, Includes housing (1) and power supply (13), control circuit board (14) and optical system disposed inside housing (1), with a light inlet / outlet window (2) opened at the lower front end of housing (1); The optical system includes an LED light source (9), a light sensor (8), a reflector (10), a beam splitter (11), and a filter (12); the LED light source (9) and the light sensor (8) are electrically connected to the power supply (13). The LED light source (9) and the light sensor (8) are installed inside the rear end of the housing, with the light sensor (8) located below the LED light source (9). A pair of parallel reflectors (10) are located in front of the LED light source (9). The beam splitter (11) and the filter (12) are installed at the middle of the bottom of the housing (1). The LED light emitted by the LED light source (9) passes through the beam splitter (11), the filter (12) and the light inlet / outlet window (2) in sequence and illuminates the test area (15). The road markings on the test area (15) reflect the LED light back. The back-reflected light passes through the light inlet / outlet window (2), the filter (12), the beam splitter (11), and a pair of reflectors (10) in sequence and is transmitted to the light sensor (8). The light sensor (8) samples the signal and then stores and calculates the back reflection value of the object under test through the control circuit board (14).

2. The portable field measuring instrument for measuring the retroreflective characteristics of road markings according to claim 1, characterized in that, The pair of parallel reflectors (10) are both at a 45° angle to the horizontal plane.

3. The portable field measuring instrument for measuring the retroreflective characteristics of road markings according to claim 1, characterized in that, The color temperature of the LED light source (9) is in the range of 2856K+50K to ensure the optical path signal.

4. The portable field measuring instrument for measuring the retroreflective characteristics of road markings according to claim 1, characterized in that, It also includes a touch screen (7), which is electrically connected to the control circuit board (14) and powered by the power supply (13). The touch screen (7) displays system information such as detection process prompts, results, and power level.

5. The portable field measuring instrument for measuring the retroreflective characteristics of road markings according to claim 4, characterized in that, The touch display screen (7) is a 5.5-inch high-brightness LCD screen.

6. The portable field measuring instrument for measuring the retroreflective characteristics of road markings according to claim 4, characterized in that, It also includes a temperature and humidity sensor, which is electrically connected to the control circuit board (14) and powered by the power supply (13). The temperature and humidity sensor measures the temperature and humidity of the road markings and then displays them on the touch screen (7).

7. The portable field measuring instrument for measuring the retroreflective characteristics of road markings according to claim 1, characterized in that, It also includes a voice broadcast module, which is electrically connected to the control circuit board (14) and powered by the power supply (13). The voice broadcast module is used to broadcast measurement data.

8. The portable field measuring instrument for measuring the retroreflective characteristics of road markings according to claim 1, characterized in that, It also includes a portable printer (3), which is mounted at the rear end of the housing (1), electrically connected to the control circuit board (14) and powered by the power supply (13) for printing measurement data.

9. The portable field measuring instrument for measuring the retroreflective characteristics of road markings according to claim 1, characterized in that, The upper part of the housing (1) is provided with a data interface (5), which is electrically connected to the control circuit board (14).

10. The portable field measuring instrument for measuring the retroreflective characteristics of road markings according to claim 1, characterized in that, The upper part of the housing (1) is also provided with a handle (4).

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