Polarized infrared spectrometer

Abstract

The invention provides a polarized infrared spectrometer which consists of, at least, one infrared light source, one interferometer, one beam splitter, one sample testing accessory, one laser device, one laser detector, two polarizing films, two infrared detectors and spectrum sampling circuit systems matched with the two detectors. The spectrometer is characterized in that the light passing through the sample testing accessory is split into two same light beams, then the two light beams respectively pass through the polarizing films on respective light paths and then are detected by the detectors on the respective light paths to obtain interferograms, the interferograms are finally subjected to Fourier transform processing, and meanwhile a parallel polarization spectrum and a vertical polarization spectrum of a sample are obtained.

Description

technical field [0001] The invention belongs to the technical field of spectrum analysis instruments, and relates to a polarized infrared spectrometer. Background technique [0002] The infrared dichroism method is a method for measuring the infrared spectrum of a sample based on infrared polarized light. Molecular infrared activity depends on vibrational modes causing dipole moment changes. The greater the dipole moment change, the greater the absorption coefficient. The infrared absorption coefficient is also related to the direction of dipole moment change (that is, the direction of vibration). If the vector direction of the vibration transition moment is parallel to the electric vector direction of the incident light, its absorption is the strongest, which is called the parallel band A / / ; Conversely, if the two are perpendicular, there will be no absorption, called vertical band A ⊥ Such as figure 1 shown). The ratio of the two is called the dichroic ratio (R), R...

AI Technical Summary

Problems solved by technology

But so far, the Fourier transform infrared spectroscopy instruments developed by all manufacturers have only one detector, which cannot simultaneously collect parallel bands A at the same time. / / and vertical band A ⊥ spectrum

To observe the orientation behavior of molecular segments during stretching of polymer materials, and to continuously measure the infrared spectrum of samples, it is necessary to precisely control and record test conditions such as temperature, force, and stretching speed. For ultra-thin and thick samples, research Different measurement accessories are required, and a large number of special accessories for different research purposes still need to be designed and developed

Images