Attenuated total reflection device applied to Fourier transform spectrograph

Abstract

The invention discloses an attenuated total reflection (ATR) device applied to a Fourier transform spectrograph. The ATR device comprises a first plane mirror, a first off-axis parabolic mirror, a second off-axis parabolic mirror, an ATR crystal, a third off-axis parabolic mirror, a fourth off-axis parabolic mirror, a second plane mirror, a third plane mirror and a fourth plane mirror. According to the ATR device provided by the invention, the light beam convergence and spot size control are achieved by using the off-axis parabolic mirrors, the use ratio of the luminous flux output by the spectrograph is improved via the mode that the dual off-axis parabolic mirrors are symmetrically distributed with respect to the ATR crystal, and thus the detection sensitivity and the signal to noise ratio are ensured. The ATR device has the characteristics of being compact, easy to integrate, and applicable to simple batch production. The ATR device has the wide application prospect in the fields ofphysics, chemistry, material, geology and biomedicine.

Description

Technical field [0001] The invention belongs to the field of spectrum analysis and photonics, and particularly relates to an attenuated total reflection (ATR) device used for a Fourier transform spectrometer. Background technique [0002] Fourier transform infrared (Fourier Transform Infrared, FTIR) spectrometer consists of broadband light source, interferometer (usually Michelson type, its basic composition includes fixed mirror, moving mirror and beam splitter), light detector, electronic control and inverse Fourier Inner leaf transformation and other parts. The interferometer performs Fourier modulation on the broadband light, and the detector records the time-varying interferogram signal. The interferogram undergoes inverse Fourier transform to obtain the spectrum. Generally, FTIR spectrometers will set up a sample compartment between the interferometer output light and the detector. By placing appropriate transmission, reflection and other test devices in the sample compart...

AI Technical Summary

Problems solved by technology

It has the problem of optical signal loss similar to CN101889195A and CN103398948B, and at the same time, the introduction of two lenses limits the applicable wavelength range and further reduces the available optical signal intensity

[0009] CN207908347U discloses a kind of Fourier transform infrared spectrometer ATR reflective accessory, it is characterized in that the traditional ATR reflective accessory can not accurately know how much pressure the sample contacts with the ATR crystal when the experiment is pressed. The pressure of the head can measure the pressure when the sample is in contact with the ATR crystal

However, it does not involve the matching of the optical path between the ATR device and the FTIR spectrometer, the coupling mode / efficiency of the optical signal and the ATR crystal

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