The electronics features of a portable infrared Fourier transform spectrometer are considered. A description of its most important components and justification for the use of the corresponding element base are given; structural diagrams are outlined, an analysis of the most significant electronic units of the device and their functioning is carried out. The results of experimental studies are presented.

Methodology for the analysis of concentrations of gaseous composite of atmosphere by the corresponding infrared (IR) spectrum, measured with the help of trajectory spectroradiometers (TSR) is observed. The developed algorithm for mathematical processing of the measurement results is briefly described, including the detection and estimation of the concentrations of the sought gases using the notch filtration of their spectral components, which makes it possible to significantly reduce the concentration identification error. The spectra of various substances in the mid-IR range are considered, and the results of approbation of the technique based on the TSR model with an external high-temperature radiation source on a 1 m path are presented.

The third author's name is incorrect. The name should read D. N. Nikol′skii.

The design of a miniature dynamic interferometer for a Fourier spectrometer is considered. The interferometer is constructed according to the classical Michelson layout. A movable flat mirror in one of the arms of the interferometer is moved using a parallelogram mechanism. A distinctive feature of this design is that almost the entire optical part of the interferometer is located inside this mechanism, which makes the interferometer very compact. A motor driving the motion of a movable mirror is described, in which the force is transmitted to the moving part through a magnetic field. The main advantages of the proposed interferometer are its low cost, easy assembly and alignment, and small size and weight.

The authors propose to implement a multi-channel continuous scan Fourier spectrometer for simultaneous recording and analysis of the spectral characteristics of several objects. To implement such a scheme is used multiprobe fiber in which several optical fibers, at one end, are connected in one optical connector and fixed in the output of interferometer. In this scheme, the Fourier spectrometer is used as a modulator. On the other hand, each fiber individually mated with the test sample and its own radiation detector. The spectral resolution of the proposed system is 1 cm-1. For the system the aperture of the spectrometer from the condition of minimum spectral resolution and optical fibers parameters is calculated. Using the proposed scheme emission spectra of helium neon lamp have been registered for each single fiber with diameter of 1 mm and a numerical aperture NA=0,22.

The design and performance features of an IR Fourier-transform spectrometer for studying the Martial atmosphere in the spectrum range of 600–5500 cm–1 during the ExoMars-2016 mission are described. The obtained spectral resolution is in agreement with the theoretical value (0.2 cm–1); the threshold of the instrument sensitivity is approximately 0.1 mW/(m2 sr cm–1).

A specific feature of scanning Fourier-transform IR spectroradiometers (FTIR SRs) is the use of a multiarea photodetector. The optical scheme of these SRs is calculated so as to provide the most efficient transfer of the IR radiation from each sector of the IR channel to the corresponding element of the multiarea photodetector. An indirect method is proposed, which makes it possible to estimate the alignment quality of the IR channel of a scanning FTIR SR based on the calculation of its characteristic instrumental functions, which should eventually provide the best sensitivity for the entire multiarea photodetector of scanning FTIR SR.

A scheme of the multi-channel continuous scan Fourier spectrometer is proposed for simultaneous recording and analysis of the spectral characteristics of several objects. The scheme is realized using a multi-probe fiber in which several optical fibers are connected in one optical connector and fixed in the output of an interferometer. The Fourier spectrometer is used as a sygnal modulator. Еach fiber is individually mated with the studied sample and its own radiation detector. For the developed system, the spectrometer aperture is calculated from the condition of the minimum spectral resolution and parameters of the optical fibers. With the help of the proposed scheme, the emission spectra of a gas-discharge neon lamp have been recorded using a single fiber with a diameter of 1 mm and a numerical aperture NA = 0.22.

One of the problems in remote monitoring and analysis is to record and analyze accumulation and summation of weak signals, which have intensity at the noise level. Therefore, it becomes necessary to correct accumulation and summation of signal to pull it at the background of noise. In the existing schemes of Fourier spectrometers, which use a white light channel, a recording process of the interferogram in the main channel starts at zero optical path difference (ZPD) of the white light channel, and thus binding to the same absolute scale of the optical path difference. With this construction scheme, there should be a shift of the ZPD of the white light channel with respect to the ZPD of the main channel, using the optical methods, so that we can record a double-sided interferogram. The additional optical elements can lead to the shift of ZPD in the white light channel with respect to the main channel. To solve the given problem we suggest a mechanism of using the white light channel, in which the ZPD positions of both channels match. In this case, the ZPD of the white light forms a mark on the optical path difference scale in the interferogram of the main channel. Further, using this label, the recorded interferograms are shifted and linked to the absolute scale of the optical path difference, after which they are summed-up. To implement this summing mechanism was developed driver of white light label, which allows us to bind a maximum position in the interferogram of the main channel with the maximum in the interferogram of the white light channel. Such construction of the binding system allows us to reduce the size of the entire system and provide more stability to thermal and vibration shocks. The described system of a label driver has found a successful implemented in the layout of the continuous scanning dynamic Fourier spectrometer operating in the Near Infrared spectral range from 800 nm to 1100 nm. The experimental research in recording and accumulating weak Raman signals when exciting by the laser source of 785 nm wavelength used the proposed system. Further comparison of the recovered Raman spectra with reference spectra proved that the proposed interferogram summation system is efficient.

We present the results of a Fourier transform IR spectroscopy study of the kinetics of the gas-phase reaction between methanol and boron trichloride. From spectral data on the kinetics of the process, we determined the rate constant for the reaction of CH3OH and BCl3. The studies were conducted on a setup consisting of a chemical reactor, optically and structurally combined with a commercial AF-3 Fourier transform IR spectrometer.