Multi-color multi-material photo-thermal sensor based on thin film thermoelectric device and test equipment

Abstract

The invention relates to a multi-color multi-material photo-thermal sensor based on a thin-film thermoelectric device and test equipment, the photo-thermal sensor comprises a light source, a quartz plate, the thin-film thermoelectric device, a temperature control module, a boost noise reduction module and a data acquisition module, one end of the thin-film thermoelectric device is a hot end in contact with a to-be-tested sample, the other end of the thin-film thermoelectric device is in contact with the temperature control module, the boost noise reduction module is respectively connected with the thin film thermoelectric device and the data acquisition module through wires, and the thin film thermoelectric device adopts a [pi]-shaped structure of which heat flow is vertical to an interface; and when the photo-thermal sensor is used, the sample to be tested is placed at the hot end and is irradiated by the light source through the quartz plate. Compared with the prior art, sensitive sensing of tiny temperature difference can be achieved, the photo-thermal effect of the multi-color and multi-material sample to be detected can be effectively distinguished, and the temperature rising process can be monitored in real time.

Description

technical field [0001] The invention belongs to the field of semiconductor thermoelectric power generation, and relates to a photothermal sensor, in particular to a multi-color and multi-material photothermal sensor and test equipment based on thin-film thermoelectric devices. Background technique [0002] The photothermal effect reflects the ability of a material to absorb light energy and convert it into heat energy. After the material is irradiated by light, the photon energy interacts with the crystal lattice, and the vibration is intensified, resulting in an increase in temperature. Photothermal conversion is widely used in solar energy harvesting, photothermal actuation, photothermal therapy, laser-induced color printing, high-temperature photothermal devices, etc. The photothermal conversion effect of various materials is closely related to the daily life of human beings. Therefore, it is necessary to conduct sensitive and accurate photothermal measurement. [0003] ...

AI Technical Summary

Problems solved by technology

[0004] Most of the current temperature measurement methods use contact temperature measurement methods such as thermocouples and thermal resistances for point temperature measurement. Non-contact temperature measurement methods (such as infrared radiation temperature measurement) are susceptible to infrared emissivity on the surface of objects, energy absorption rate on the surface of materials, Due to the influence of the surrounding environment, the measurement accuracy is low, and it is difficult to effectively and accurately measure the small temperature difference changes in the plane required for photothermal measurement

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