Large-dynamic-range omnibearing sample BRDF (bidirectional reflectance distribution function) measuring device

A technology with a large dynamic range and a measuring device, which is applied in the measurement of scattering characteristics, etc., can solve the problems of difficult to achieve a large dynamic range measurement, few design solutions for the device, and limited sensitivity of the detector, so as to facilitate the calculation of azimuth and astronomical angle. Top angle, large dynamic measurement range, convenient test effect

Inactive Publication Date: 2016-01-20
XIAN TECHNOLOGICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] For the second function, the existing devices generally only design a single detector, the sensitivity of a single detector is limited, and its detection limit is

Method used

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  • Large-dynamic-range omnibearing sample BRDF (bidirectional reflectance distribution function) measuring device
  • Large-dynamic-range omnibearing sample BRDF (bidirectional reflectance distribution function) measuring device
  • Large-dynamic-range omnibearing sample BRDF (bidirectional reflectance distribution function) measuring device

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0045] Embodiment 2: On the basis of embodiment 1, a filter can be added to the front end of the light pipe 11, and the inner wall of the light pipe 11 is blackened, and the scattered light from the sample surface is incident on the detector through the light pipe and the filter On the one hand, the setting of the light pipe avoids the impact of spatial stray light incident on the detector on the measurement, on the other hand, it avoids the impact of dust and other particles on the incident light path on the measurement. The filter only allows a certain wavelength range The light incident on the detector greatly improves the signal-to-noise ratio of the measurement.

Example Embodiment

[0046] Embodiment 3: The difference from embodiment 1 is that it can be filled with detector modules on the detector track, and correspondingly increase the lock-in amplifier module and data acquisition channel, and carry out similar synchronous acquisition and amplification of the measurement signal. , You can achieve multi-point simultaneous measurement and improve measurement efficiency.

Example Embodiment

[0047] Example 4: On the basis of Example 1: For the measurement of the incident light power of the light source, the sample can be replaced with a total reflection mirror, and the incident angle and azimuth angle of the incident light are adjusted to a certain position, such as the zenith angle set to -30°, the azimuth angle is 90°, and the photomultiplier tube is temporarily removed (to avoid strong light damage), and an attenuation sheet can be added to the front end of the light pipe 11 to attenuate the light energy to the detection range of the photodiode. The zenith angle of the module is set to 30°, and the azimuth angle is 270°, that is, the reflected light enters the photodiode for detection to obtain the radiant flux of the incident reference light, which is convenient to calculate the BRDF (Note: You can change the rotation axis 5-1 and the rotation axis 5 The axis connection of -2 constitutes the X axis. The direction of the X axis is defined as the axis line from th...

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Abstract

The invention relates to a large-dynamic-range omnibearing sample BRDF (bidirectional reflectance distribution function) measuring device. Two semi-circular arc rails are in coaxial symmetrical installation; a sample is arranged in the center of the semi-circular arc rails; rotating shafts arranged at the two ends of the semicircular arcs are positioned on the same connecting line; the connecting line is positioned in the sample plane and passes through the center of the sample; the center of each semicircular arc is rotationally connected with a linear pull rod, and the other end of each linear pull rod is connected with a slide block; each slide block is arranged on the corresponding linear guide rail, and can move along the corresponding linear guide rail for driving the corresponding semi-circular rail to rotate; the two linear guide rails are symmetrically arranged in the sample plane; the center line of the linear guide rails is vertical to the rotating shafts of the semi-circular arcs; a detector module comprises a photodiode and a photomuitplier dual detector; the photosensitive surface connecting line is vertical to the rotating shafts of the semi-circular arc; the system uses a semiconductor laser; the circular arc rails and the linear guide rails are provided with scales; the sample can realize two-dimensional transverse moving and 360-degree rotation when being put on a three-dimensional moving platform; the light source and detector full-space angle accurate metering scanning can be performed; the high-reliability full-automatic measurement of the sample BRDF can be realized.

Description

technical field [0001] The invention relates to the technical field of sample laser scattering characteristics, and relates to a large dynamic range omnidirectional sample BRDF measuring device. Background technique [0002] Light is an electromagnetic wave, and the phenomenon of light scattering is the result of the interaction between the incident electromagnetic wave and the particles in the medium. The scattering field reflects the properties, geometry, position, size, and shape of the surface and internal defects of the material. Light scattering measurement can obtain direct data of light scattering in the sample space. Through the analysis and inversion of the measurement data, it is also possible to understand the material essential properties. At the same time, laser scattering measurement has the advantages of wide adaptability, wide measurement range, accurate and rapid measurement, good repeatability, and non-contact measurement. , geology, geography and other ...

Claims

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Application Information

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IPC IPC(8): G01N21/47
Inventor 刘卫国高爱华王少刚闫丽荣陈智利郭蓉赵翔
Owner XIAN TECHNOLOGICAL UNIV
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