Air Refractive Index Measurement Device and Method Based on Inflatable and Deflatable Vacuum Chamber
A technology of measuring devices and vacuum chambers, which is applied in the directions of measuring devices, phase influence characteristic measurement, instruments, etc., can solve the problems of low measurement accuracy and achieve the effect of improving measurement accuracy and anti-interference ability
Active Publication Date: 2021-10-29
NAT INST OF METROLOGY CHINA
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[0004] This application proposes an air refractive index measurement device and method based on an inflatable and deflatable vacuum chamber. The main and auxiliary measurement signals are formed respectively through the main Fappaure unit and the secondary Fappaure unit, and the optical path change is adjusted by using the principle of an optical cursor. Number, to achieve high-precision measurement of air refractive index, to solve the problem of low measurement accuracy in the existing measurement technology
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[0038] The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.
[0039] In order to make the above objects, features and advantages of the present application more obvious and comprehensible, the present application will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods.
[0040] The vernier effect was originally used to improve the resolution of length measurement (such as a vernier caliper). Its working principle is to use the small scale difference between the main ruler and t...
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The application discloses a device and method for measuring the refractive index of air based on an inflatable and deflated vacuum chamber. The device includes: a main FAPO unit, a secondary FAPO unit, a laser unit, a control unit, and a photoelectric unit; the laser unit is used to generate two beams of laser light with different wavelengths, the main and secondary Fappaure units are used to form different measurement beams, the photoelectric unit is used to obtain corresponding measurement signals, and the control unit is used to demodulate the measurement signals and calculate the air refractive index; the method includes: The laser unit generates two laser beams with different wavelengths at the same time, forms two measuring beams through different FAPP units, and obtains two measuring signals through the photoelectric unit, and the control unit judges whether the two measuring signals reach the interference peak, so as to calculate the air refraction Rate. This application can realize 10 ‑10 High measurement accuracy, and simple and easy to operate.
Description
technical field [0001] The application belongs to the field of air refractive index measurement, in particular to an air refractive index measurement device and method based on an inflatable and deflated vacuum chamber. Background technique [0002] The refractive index of air plays a very important role in optical precision measurement and other fields, and often affects the accuracy of the final measurement result. In optical precision measurement, compensating the refractive index of air can greatly improve the measurement accuracy. Especially when a laser interferometer is used for a large range of measurement, the influence of the refractive index of air becomes very large, and the refractive index of air must be accurately measured at this time. [0003] At present, the measurement methods of air refractive index include laser synthesis wavelength method, Rayleigh interferometry method, bellows double interferometry method, etc. The measurement accuracy of laser inte...
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IPC IPC(8): G01N21/45G01N21/01
CPCG01N21/45G01N21/01
Inventor 张鹏崔建军陈恺崔京远
Owner NAT INST OF METROLOGY CHINA