Broadband microwave spectrometer based on multi-pulse free induction attenuation technology
A technology of inductive attenuation and spectrometer, applied in the direction of color/spectral characteristic measurement, spectrum investigation, etc., can solve the problems of low molecular rotation spectral sensitivity and resolution, slow spectral scanning frequency, etc., to improve sensitivity, increase signal sampling frequency, The effect of reducing sample consumption
Pending Publication Date: 2021-04-16
NANJING UNIV OF SCI & TECH
View PDF2 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
However, at present, the sensitivity and resolution of broadband microwave spectrometers to detect molecular rotation spectra are not high, and the spectral scanning frequency is not fast.
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0026] In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not intended to limit the present application.
[0027] In one embodiment, combined with figure 1 , the present invention proposes a broadband microwave spectrometer based on multi-pulse free induction attenuation technology, including a broadband electromagnetic wave radiation source, a sample vacuum chamber and a molecular spectral signal detection system;
[0028] A broadband electromagnetic wave radiation source is used to generate multiple chirped pulse signals and single-frequency microwave signals, and mix the two signals and up-convert them to the target frequency band, thereby generating multiple microwave excit...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a broadband microwave spectrometer based on a multi-pulse free induction attenuation technology. The spectrometer comprises a broadband electromagnetic wave radiation source, a sample vacuum chamber and a molecular rotation spectrum signal detection system, wherein thebroadband electromagnetic wave radiation source is used for generating a plurality of chirped pulse signals and single-frequency microwave signals, carrying out the frequency mixing of the two types of signals, and carrying out the up-conversion of the two types of signals to a target frequency band, and thus, generating a plurality of microwave excitation pulses and outputting themicrowave excitation pulses to the sample vacuum chamber; the sample vacuum chamber is used for providing a space, and a plurality of microwave excitation pulses are used for carrying out microwave excitation on the to-be-detected sample gas molecular beam which is sprayed out once for multiple times in the space to generate a plurality of free induction attenuation signals; and the molecular rotation spectrum signal detection system is used for receiving a signal obtained by mixing the plurality of free induction attenuation signals and the single-frequency microwave signal and carrying out down-conversion to fundamental frequency, and obtaining the rotation spectrum of the molecular beam of the to-be-detected sample gas from the signal. The signal sampling frequency can be greatly improved, the signal-to-noise ratio of spectrum capture of the spectrometer is improved, the sample consumption is reduced, and the instrument operation cost is saved.
Description
technical field [0001] The invention relates to the technical field of molecular rotation spectroscopy and molecular detection, in particular to a broadband microwave spectrometer based on multi-pulse free induction attenuation technology. Background technique [0002] Rotational spectroscopy is an effective technique for studying molecular structures in the gas phase. The molecular rotation spectrum is highly sensitive to small structural changes. When a fine or ultra-fine structure is observed, by analyzing the ultra-fine rotational energy level transition spectrum of the molecule, a very precise molecular geometric structure and electronic structure can be fitted. In chemical analysis , The field of pharmaceutical synthesis has important applications. In radio astronomy, the technique also plays a key role in probing the chemical composition of the interstellar medium. [0003] Due to the abundance of molecular rotational spectrum information in the microwave band, micr...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/25G01J3/28
Inventor 陈钱孙铭焦超段圣文
Owner NANJING UNIV OF SCI & TECH