Abstract

We demonstrate the constant temperature (CT) operation of a fiber-optic anemometer based on a laser-heated silicon Fabry–Perot interferometer (FPI), where the temperature of the FPI is kept constant by adjusting the heating laser power through a feedback control loop and the output signal is the heating laser power. We show that the CT operation can dramatically improve the frequency response over the commonly used constant power (CP) operation, where the laser heating power is kept constant and the output signal is the temperature of the FPI. For demonstration, we used a 100-μm-diameter, 200-μm-thick silicon FPI attached to the tip of a single-mode fiber as the anemometer. The FPI was heated by a 980-nm diode laser, and the temperature was measured using a 1550-nm diode laser. The effect of flow changes was simulated by exposing the silicon FPI to radiation from an external intensity-modulated laser beam. We show that the 10%–90% rise time of the step response in air was reduced from 625 ms for CP operation to 1.8 ms for CT operation, and the 3-dB bandwidth was increased from 0.5 Hz for CP operation to 2 kHz for CT operation. The response of the anemometer also shows good linearity to the radiation power.

© 2019 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Fast-response fiber-optic anemometer with temperature self-compensation

Guigen Liu, Weilin Hou, Wei Qiao, and Ming Han
Opt. Express 23(10) 13562-13570 (2015)

Long-range distributed optical fiber hot-wire anemometer based on chirped-pulse ΦOTDR

Andres Garcia-Ruiz, Alejandro Dominguez-Lopez, Juan Pastor-Graells, Hugo F. Martins, Sonia Martin-Lopez, and Miguel Gonzalez-Herraez
Opt. Express 26(1) 463-476 (2018)

Self-gauged fiber-optic micro-heater with an operation temperature above 1000°C

Guigen Liu, Qiwen Sheng, Dustin Dam, Jiong Hua, Weilin Hou, and Ming Han
Opt. Lett. 42(7) 1412-1415 (2017)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (5)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Metrics

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription