Gas concentration sensor based on pt symmetrical structure

Abstract

The invention discloses a gas concentration sensor based on a PT symmetrical structure, comprising: a loss layer, a first inductance layer, a second inductance layer and a gain layer, wherein the loss layer, the first inductance layer, the second inductance layer are arranged in sequence from left to right Two inductance layers and gain layers, an air layer between the loss layer and the first inductance layer, a gas layer to be detected between the first inductance layer and the second inductance layer, and an air layer between the second inductance layer and the gain layer, And the distance between the loss layer and the first inductor layer is equal to the distance between the second inductor layer and the gain layer. The sensor has a simple structure and low cost, can avoid gas-sensitive materials and its complex preparation process, and can also detect extremely small-scale disturbances in the refractive index caused by low-density gas molecules, and has the advantage of high sensitivity in a low concentration range.

Description

technical field [0001] The invention relates to the field of sensing technology, in particular to a high-sensitivity gas concentration sensor based on a PT symmetrical structure. Background technique [0002] At present, typical gas sensing is mainly based on the spectral measurement mechanism. The change of the refractive index of the measured gas causes the position of the transmission peak or absorption peak in the transmission spectrum of the structure to change. Therefore, as long as the transmission spectrum of the structure is measured, the corresponding gas refraction can be calculated. Rate. Although existing sensor schemes can achieve high sensitivity, there are several problems in the following aspects: first, a large structural period is required, resulting in a large sensor scale; second, a wide-spectrum light source is required; third, when detecting weak When absorbing peaks or spectral lines, reading data requires complex spectrometer cooperation. As above,...

AI Technical Summary

Problems solved by technology

Although existing sensor schemes can achieve high sensitivity, there are several problems in the following aspects: first, a large structural period is required, resulting in a large sensor scale; second, a wide-spectrum light source is required; third, when detecting weak When absorbing peaks or spectral lines, reading data requires the cooperation of complex spectrometers

As above, the above aspects will lead to complex sensor design and high cost

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