Device for determining the coefficient of reflective film

Abstract

FIELD: measuring technology.SUBSTANCE: invention can be used to determine the coefficient of retroreflection of reflective film for road signs. A device for determining the coefficient of retroreflection of a reflective film comprises a plastic housing (1), in which a reference radiation receiver (2), a radiation source (3), an optical illumination system (4), an optical system of a receiving channel (5), a matrix radiation receiver (6), and a colour-sensitive radiation receiver (7) are placed.EFFECT: determining the coefficient of retroreflection of a reflective film with automatic determination of the specific coefficient of retroreflection of the material at various viewing and illumination angles.3 cl, 2 dwg

Description

[0001] The invention relates to the field of science and technology, in particular to measuring technology, and can be used to determine the coefficient of retroreflection of reflective film for road signs.

[0002] A system for assessing the retroreflective ability of glass microspheres for horizontal road markings is known, which includes a light source, a photodetector, and an optically transparent vessel in which a layer of glass microspheres is placed [RU No. 143898 U1, published 10.08.2014].

[0003] The disadvantages of the known technical solution are that the system consists of several structural elements that must be adjusted each time the retroreflectivity of glass microspheres is measured. In addition, the retroreflectivity coefficient of road markings must be calculated manually, which also indicates a lack of versatility of the system and an extension of the time required for the work.

[0004] A device for determining the retroreflectivity of glass microspheres is also known. It was selected as the closest analog. It comprises a light source, a photodetector, and glass microspheres. The glass microspheres are placed in a horizontal layer in an open-topped container, preventing direct light from reaching the bottom of the container. The photodetector is mounted above the center of the container, and the light source is positioned at an acute angle to the vertical axis, with the ability to adjust the angle [RU No. 2554284 C1, published June 27, 2015, prototype].

[0005] The disadvantages of the prototype are: a complex design feature of the device, which must be adjusted for each measurement of the retroreflectivity of glass microspheres, and limited viewing angles α and illumination angles β, in addition, the calculation of the retroreflectivity coefficient of glass microspheres is performed manually, which also indicates a lack of versatility of the device and an increase in the time required for the work.

[0006] The technical result achieved by the invention consists in creating a portable and universal device for determining the coefficient of retroreflection of a reflective film, which ensures automatic determination of the specific coefficient of retroreflection of the material at various angles of observation and illumination, within a short period of time of the work being performed.

[0007] In order to achieve the technical result, a device is proposed for determining the coefficient of retroreflection of a reflective film, characterized in that it contains a plastic housing made with the possibility of fixing an adapter thereon for setting the angle of illumination of the reflective film and the structural placement therein of optoelectronic and optical components that form between themselves optoelectronic channels for illuminating a film sample and receiving reflected radiation, wherein the housing contains a radiation source, a reference radiation receiver designed to control the power of the radiation source, an optical illumination system in the form of a collimating lens, an optical system of the receiving channel in the form of a focusing lens, a matrix radiation receiver in combination with a video camera and a color-sensitive radiation receiver in the form of an RGB photodiode designed to determine the color of the sample being monitored and connected to the matrix radiation receiver, and for displaying information,based on the processing of measurement results, calculation of the specific coefficient of retroreflection of the material R, A at different viewing angles and lighting and determining the color of the reflective film, the device contains a display and a USB channel for connecting a personal computer.

[0008] According to the invention, a white phosphor LED can be used as a radiation source, and a silicon photodiode can be used as a reference radiation receiver.

[0009] The invention is illustrated by drawings. Fig. 1 shows a model of a device for determining the retroreflectivity coefficient of a reflective film in 3D; Fig. 2 shows a functional and optical diagram of the device for determining the retroreflectivity coefficient of a reflective film.

[0010] The claimed device for determining the coefficient of retroreflection of a reflective film comprises a plastic housing 1, in which a reference radiation receiver 2, a radiation source 3, an optical illumination system 4, an optical system of the receiving channel 5, a matrix radiation receiver 6, a color-sensitive radiation receiver 7 are placed. The plastic housing is designed with the possibility of being secured to the front end using magnets of an adapter for setting the angle of illumination of the reflective film 8. A phosphor white light-emitting diode can be used as the radiation source 3, and a silicon photodiode is used as the reference radiation receiver 2.

[0011] The claimed device for determining the coefficient of retroreflection of a reflective film operates as follows. Device 1 is switched on by pressing the button and holding it for 3 s. After switching on, the auto-calibration operation is performed. The device is turned on. The "Auto-calibration" operating mode is selected (or automatically each time it is switched on). Auto-calibration of the device is performed by installing a reference sample of a reflective film with known values ​​​​of the specific coefficient of retroreflection at a zero value of the illumination angle (β = 0°) for three observation angles (12', 20' and 2°), obtained experimentally. These values ​​​​of the specific coefficient of retroreflection must be pre-recorded in the device memory. If necessary, these values ​​​​can be adjusted. After auto-calibration, the device does not turn off. The device is switched from the "Auto-calibration" mode to the "Measurement" mode.The first of three angular adapters (for an illumination angle of β=5°) is installed on the device. The device with the installed adapter is applied without gaps to the tested sample of retroreflective sheeting 8. The radiation source 3 emits a luminous flux, which is necessary for illuminating the tested sample of retroreflective sheeting 8, the reference radiation receiver 2 measures the emitter's luminance in candelas before passing through the optical illumination system 4 and re-reflection, the optical illumination system 4 illuminates the tested sample of retroreflective sheeting 8, the reflected radiation flux enters the optical system of the receiving channel 5, which, using a focusing lens, directs the reflected radiation flux to the matrix receiver 6 to record the angle and luminance of the radiation flux. The display automatically displays the values ​​of the illumination angle, three observation angles, and the specific coefficient of retroreflection (SCR) of the material, in cd⋅lx. -1 ⋅m -2for each of the three viewing angles. The color of the tested reflective film sample 8 is determined by the color-sensitive radiation detector 7 based on the CSR parameter value. The color determination procedure is performed in parallel with the measurement of the film's specific reflectivity coefficient, and the result appears on the display as "Red," "Yellow," "Green," "Blue," or "White."

[0012] If repeated measurements of the same reflective sheeting sample 8 are required, the obtained values ​​should be stored in the device's memory. A second measurement is then taken, and the results are also stored in the device's memory. After completing a series of measurements of the same reflective sheeting sample 8, the operator activates the "Average Value Calculation" function, which results in the device calculating the average value of each of the three parameters R. A (12'), R A (20'), R A(2°) and shows these values ​​for the corresponding observation angles.

Claims

1. A device for determining the coefficient of retroreflection of a reflective film, characterized in that it contains a plastic housing made with the possibility of securing an adapter thereon for setting the angle of illumination of the reflective film and the structural placement therein of optoelectronic and optical components that form between themselves optoelectronic channels for illuminating a film sample and receiving reflected radiation, wherein the housing contains a radiation source, a reference radiation receiver designed to control the power of the radiation source, an optical illumination system in the form of a collimating lens, an optical system of the receiving channel in the form of a focusing lens, a matrix radiation receiver in combination with a video camera and a color-sensitive radiation receiver in the form of an RGB photodiode designed to determine the color of the sample being tested, and to display information based on the processing of the measurement results,calculation of the specific coefficient of retroreflection of the material R, A at different viewing angles and lighting and determining the color of the reflective film, the device contains a display and a USB channel for connecting a personal computer.

2. A device for determining the coefficient of retroreflection of a reflective film according to paragraph 1, characterized in that a white phosphor LED is used as the radiation source.

3. A device for determining the coefficient of retroreflection of a reflective film according to paragraph 1, characterized in that a silicon photodiode is used as a reference radiation receiver.

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