A Portable Refractive Index Measuring Device and Refractive Index Measuring Method
A measurement device, a technology of refractive index, applied in the direction of measurement device, phase influence characteristic measurement, instrument, etc., can solve the problems of complex device, unfavorable miniaturization, portable measurement, expensive equipment, etc.
Inactive Publication Date: 2021-04-06
绍兴柯桥睿宇光电科技有限公司
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Problems solved by technology
The advantage of this method is that the structure is simple, the test piece is inserted into the system more conveniently, and the light passes through the test piece twice, which is beneficial to improve the accuracy. The disadvantage is that the surface image of the beam splitter prism easily interferes with the useful interference fringes.
[0005] All of the above methods for measuring the refractive index have complex devices, expensive equipment, and are not conducive to miniaturization and portability measurement.
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[0109] Such as figure 1 In this embodiment, a portable device for measuring the refractive index mainly includes: a laser diode 1 as a light source; a calibration pattern 2; an image sensor 3 (using a CMOS image sensor).
[0110] Between the calibration pattern 2 and the image sensor 3 is a sample pool for placing the sample 4 to be tested.
[0111] In this embodiment, the central wavelength of the laser diode 1 is 650nm, the calibration pattern 2 is the U.S. Air Force resolution version pattern (USAF1951), the resolution of the image sensor 3 is 640*480, and the pixel size is 2.2um; example sample to be tested 4 is a ZnSe plate.
[0112] Such as figure 1 As shown in part (a), the distance from the laser diode 1 to the calibration pattern 2 is about 100mm, and the distance from the calibration pattern 2 to the image sensor 3 is within about 10mm.
[0113] The first step in the measurement is to light up the laser diode first, and record a hologram H on the image sensor with...
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Abstract
The invention discloses a portable refractive index measurement device and a refractive index measurement method, wherein the portable refractive index measurement device includes a light source, a sample pool and an image sensor arranged sequentially along the optical path, and a calibration plate is also provided between the light source and the sample pool, The calibration plate has a calibration pattern; the image sensor is used to obtain the image data of the calibration pattern before and after placing the sample to be measured in the sample cell, so as to calculate the refractive index of the sample to be measured. The portable refractive index measuring device of the invention has a simple structure, is portable and relatively low in cost, and can measure and monitor the refractive index of transparent solids, liquids and gases in real time.
Description
technical field [0001] The invention relates to the technical field of refractive index measuring instruments, in particular to a portable refractive index measuring device and a refractive index measuring method. Background technique [0002] Measuring the refractive index of transparent solids, liquids and gases is a widely used technique in production and life. There are many methods for measuring the refractive index, mainly including the method of using the law of refraction to measure the refractive index and the method of using the Fresnel formula to measure the refractive index. There are four methods of measuring refractive index, interferometry and shadow method. Among them, the most commonly used method in production experiments is the method of measuring the refractive index by using the law of refraction. The methods using the law of refraction include the precision goniometer method, the prism refractometer method, the Abbe refractometer method and the immersio...
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IPC IPC(8): G01N21/45
CPCG01N21/453
Inventor 杨臻垚曹俊杰卞殷旭
Owner 绍兴柯桥睿宇光电科技有限公司