Highly sensitive photoacoustic sensors

Highly sensitive resonant sensors

By encapsulating a silicon resonant sensor in a vacuum, the effect of air viscosity is eliminated, and the sensor can respond to weak external vibration force. This sensor can be applied to various applications, one of which is to detect extremely weak sound waves.

Application to non-invasive blood glucose level sensor using photoacoustics

When living organisms absorb irradiated laser pulses, they emit weak sound waves (photoacoustics).
By detecting these sound waves with the resonant sensor, it is possible to detect substances in the body (photoacoustic detection).
Using this principle, we have succeeded in non-invasively measuring blood glucose levels in the body.
An overview of the sensor can be found in the following paper.

Hermetically Packaged Microsensor for Quality Factor-Enhanced Photoacoustic Biosensing,
Journal: Photoacoustics, Volume 18, Issue: 1.

Link: https://www.sciencedirect.com/science/article/pii/S221359792030029X

This sensor can also be applied to various non-destructive testing and other applications.

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