Microwave absorption spectrum measurement device and microwave absorption spectrum measurement method based on thermo-acoustic effect and application thereof

Abstract

The invention relates to a microwave absorption spectrum measurement device based on thermo-acoustic effect. The microwave absorption spectrum measurement device comprises a microwave generator, a transmitting antenna, a sample tank, an ultrasonic detector, an amplifier, a data acquisition card and a computer, wherein the microwave generator, the transmitting antenna and the sample tank are arranged in sequence along a microwave input direction of the sample tank; and the sample tank, the ultrasonic detector, the amplifier, an oscilloscope and the computer are further arranged in sequence along an ultrasonic output direction of the sample tank. The invention further relates to a microwave absorption spectrum measurement method based on the thermo-acoustic effect and application of the microwave absorption spectrum measurement device based on the thermo-acoustic effect. The invention provides a method for directly measuring a microwave absorption coefficient and a microwave absorption spectrum, and the influences of microwave scattering and reflection are alleviated; and the thermo-acoustic effect is introduced into the measurement of the microwave absorption spectrum for the first time and substance concentration analysis can also be provided; and the method belongs to the technical field of the measurement of the microwave absorption spectrum.

Description

technical field [0001] The present invention relates to microwave absorption spectrum measurement technology, in particular, to a microwave absorption spectrum measurement device based on thermoacoustic effect, a method for measuring microwave absorption spectrum based on thermoacoustic effect using the measurement device, and a thermoacoustic effect-based measurement method. Application of microwave absorption spectrum measurement device. Background technique [0002] In the fields of food testing, biomedicine, mineral geology, etc., chemical composition analysis is an essential operation step. It is especially important to need a set of real-time monitoring and recording materials caused by factors such as concentration and temperature during operation. A device for changing macroscopic quantities to study the influence of these factors on it. Microwave spectroscopy, referred to as spectroscopy, is a branch of physics that studies the properties, structure and motion of m...

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Problems solved by technology

However, because the strength of the thermoacoustic signal is affected by the shape of the sample, the external environment temperature, humidity, the vibration of the microwave source, etc., the thermoacoustic effect cannot directly measure the microwave absorption spectrum of the object, so a stable and reliable microwave thermoacoustic signal is required. Device to realize microwave absorption spectrum measurement based on thermoacoustic effect

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