Cavity-enhanced photoacoustic sensor based on a whispering-gallery-mode diode laser
<p>A cavity-enhanced photoacoustic (CEPA) sensor was developed based on an ultra-narrow linewidth whispering-gallery-mode (WGM) diode laser. A cavity-enhanced photoacoustic module (CEPAM) was designed to match the output beam from the WGM-diode laser, resulting in an increase in the excitation...
| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2019-03-01
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| Series: | Atmospheric Measurement Techniques |
| Online Access: | https://www.atmos-meas-tech.net/12/1905/2019/amt-12-1905-2019.pdf |
| Summary: | <p>A cavity-enhanced photoacoustic (CEPA) sensor was developed based on an
ultra-narrow linewidth whispering-gallery-mode (WGM) diode laser. A
cavity-enhanced photoacoustic module (CEPAM) was designed to match the output
beam from the WGM-diode laser, resulting in an increase in the excitation
light power, which, in turn, significantly enhanced the photoacoustic signal
amplitude. The results show that a signal gain factor of 166 was achieved,
which is in excellent agreement with the power enhancement factor of 175
after considering the power transmissivity. The performance of the sensor was
evaluated in terms of the detection sensitivity and linearity. A 1<span class="inline-formula"><i>σ</i></span>
detection limit of 0.45 ppmV for <span class="inline-formula">C<sub>2</sub>H<sub>2</sub></span> detection was obtained at
atmospheric pressure with a 1 s averaging time.</p> |
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| ISSN: | 1867-1381 1867-8548 |