Detection of sub-terahertz photoacoustic effect for non-contact material sensing
We demonstrate the generation of photoacoustic signals in aqueous samples by continuous sub-terahertz irradiation detectable with a standard microphone. We confirm that the frequency response of the photoacoustic signals is dependent on the sound speed in the sample, demonstrating its potential for...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2021-12-01
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| Series: | Measurement: Sensors |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2665917421002026 |
| Summary: | We demonstrate the generation of photoacoustic signals in aqueous samples by continuous sub-terahertz irradiation detectable with a standard microphone. We confirm that the frequency response of the photoacoustic signals is dependent on the sound speed in the sample, demonstrating its potential for non-contact inspection. As a proof of concept, we demonstrate that water temperature can readily be discerned with the proposed method. The use of sub-terahertz waves for excitation and acoustic waves for detection allows us to inspect a sample inside a container through its wall in a non-contact manner. |
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| ISSN: | 2665-9174 |