High-time-resolved orientation detection light path and experimental method
A technology of time resolution and experimental method, which is applied in high time resolution orientation detection optical path and experimental field, can solve the problem that it is difficult to meet the above requirements, and achieve the effect of ensuring the signal-to-noise ratio
Pending Publication Date: 2018-07-03
UNIV OF SCI & TECH OF CHINA
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[0005] The solutions in the prior art are difficult to meet the above requirements
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[0021] The embodiments of the present invention will be further described in detail below. The content not described in detail in the embodiments of the present invention belongs to the prior art known to those skilled in the art.
[0022] The preferred embodiment of the orientation detection optical path with high time resolution of the present invention is:
[0023] Mainly include: tunable quantum cascade laser controller, tunable quantum cascade laser, frequency doubling delay circuit, photoelastic modulator controller, photoelastic modulator, polymer film samples, high-speed data acquisition system, high-speed detector ;
[0024] The trigger signal of the tunable quantum cascade laser controller is sent to the tunable quantum cascade laser, and the optical signal emitted by the tunable quantum cascade laser passes through the photoelastic modulator and the polymer film sample After arriving at the high-speed detector, the electrical signal of the high-speed detector is s...
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The invention discloses a high-time-resolved orientation detection light path and an experimental method. The orientation detection light path mainly comprises a tunable quantum-grade cascaded laser controller, a tunable quantum-grade cascaded laser, a frequency-doubling time-delay circuit, a photoelastic modulator controller, a photoelastic modulator, a high-molecule film sample, a high-speed data collection system and a high-speed detector, wherein the tunable quantum-grade cascaded laser is controlled by the tunable quantum-grade cascaded laser controller to emit light; the photoelastic modulator controller is used for providing an initial trigger signal; an un-delayed frequency-doubling trigger signal is acquired after the initial trigger signal passes through the frequency-doubling time-delay circuit; and the high-speed data collection system is used for controlling the frequency-doubling time-delay circuit and finally providing a delayed and frequency-doubled trigger signal to the tunable quantum-grade cascaded laser controller. According to the high-time resolution orientation detection light path, the orientation detection of samples with different thickness and different absorption degrees can be realized, the whole orientation evolution process of the samples can be detected, and the orientation detection with a time resolution of 10 microseconds is realized.
Description
technical field [0001] The invention relates to a detection technology for in-situ research on the evolution of material orientation by using a tunable quantum cascade laser combined with a photoelastic modulator, in particular to a high time-resolution orientation detection optical path and an experimental method. Background technique [0002] Due to the extremely large asymmetry between the length direction and the width direction of polymer materials, they are easily arranged along the direction of the external force field under the external force field, which is the orientation of the polymer. Orientation largely determines the mechanical and optical properties of polymers. Therefore, many methods for detecting the degree of orientation have been developed, such as X-ray diffraction method, birefringence method, infrared dichroism spectroscopy and so on. Among them, infrared dichroic spectroscopy is widely used in orientation detection because it can simultaneously dete...
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IPC IPC(8): G01N21/39G01N21/01
CPCG01N21/01G01N21/39
Inventor 李良彬叶克孟令蒲陈晓伟张文文吕艳坤
Owner UNIV OF SCI & TECH OF CHINA