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Multi-pulse free decay method used for signal acquisition of microwave spectrometer

A signal acquisition and spectrometer technology, applied in the field of spectral analysis, can solve problems such as low operation efficiency, waste, and low detection sensitivity, and achieve the effects of reducing sample consumption, saving experimental costs, and eliminating background noise.

Active Publication Date: 2018-01-19
NANJING UNIV OF SCI & TECH
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Problems solved by technology

The large aluminum mirror is very challenging for the precise mechanical transmission required for frequency modulation of the Franco-Brought cavity and maintaining the high vacuum of the large vacuum chamber, resulting in low operating efficiency
[0003] The US National Bureau of Standards has explored the construction of portable microwave spectrometers. Due to the small size of the Fabry-Broux cavity, although it is easy to operate, the detection sensitivity is slightly low.
In addition, since the molecular beam of the gas to be measured injected into the vacuum chamber has a very short lifetime, if a single excitation and sampling are performed according to the general process, not only the efficiency is low, but also great waste will be caused.

Method used

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  • Multi-pulse free decay method used for signal acquisition of microwave spectrometer
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Embodiment Construction

[0013] A multi-pulse free-attenuation method for microwave spectrometer signal acquisition using narrow-band Fourier microwave spectrometers such as figure 1 As shown, the narrowband Fourier microwave spectrometer includes a microwave source system, a Fabry cavity, a low noise amplifier, a mixer, a low frequency amplifier, a vacuum system, an ultrasonic nozzle system, and a computer control system. The microwave source system includes a microwave generator, power distributor and pin switch, the attenuation method includes the following steps:

[0014] (1) Adjust the Fabu cavity to the resonance frequency of the microwave fundamental mode through a radio frequency detector;

[0015] (2) The nozzle ejects the sample gas in the form of pulses, and reaches the center of the Fa-Broux chamber after a delay;

[0016] (3) The computer control system controls the microwave generator to send a 1 microsecond microwave every 200 microseconds, and then it is divided into two paths by the ...

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Abstract

The invention discloses a multi-pulse free decay method used for signal acquisition of a microwave spectrometer. As life of a gas molecular beam to be measured which is injected into a vacuum chamberis at the millisecond level, single-time microwave excitation and sampling process of free induction decay signals are compared. A sample gas is excited and sampled for multiple times such that signalsampling efficiency is raised by nearly one order of magnitude; and sample consumption also can be reduced, and experimental cost is saved. If a nozzle switch is delayed, background noise also can beeliminated.

Description

technical field [0001] The invention relates to spectrum analysis technology, in particular to a multi-pulse free attenuation method for microwave spectrometer signal collection. Background technique [0002] The narrowband microwave spectrometer is mainly composed of a microwave source system, a Fabry cavity, a vacuum system, an ultrasonic nozzle system, and a computer control system. The high-end technical index of the microwave spectrometer is to simulate and synthesize extremely unstable molecules, free radicals or ions in the interstellar environment and detect them. This places high demands on the sensitivity of the instrument. Since the microwave wavelength is on the order of centimeters, compared with spectrometers in other bands, the Fa-Broux cavity is too large. Large aluminum mirrors are extremely challenging for the precise mechanical transmission required for frequency modulation of the Fabry-Beaux cavity and for maintaining the high vacuum of the large vacuum...

Claims

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Application Information

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IPC IPC(8): G01N21/69
Inventor 孙铭许孜
Owner NANJING UNIV OF SCI & TECH
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