Constant temperature operation of fiber-optic hot-wire anemometers

Nezam Uddin, Guigen Liu, Qiwen Sheng, Ming Han

Research output: Contribution to journalArticle

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.

Original languageEnglish (US)
Pages (from-to)2578-2581
Number of pages4
JournalOptics Letters
Volume44
Issue number10
DOIs
StatePublished - May 15 2019

Fingerprint

hot-wire anemometers
fiber optics
interferometers
anemometers
laser heating
temperature
silicon
semiconductor lasers
output
radiation
feedback control
frequency response
linearity
adjusting
laser beams
bandwidth

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Constant temperature operation of fiber-optic hot-wire anemometers. / Uddin, Nezam; Liu, Guigen; Sheng, Qiwen; Han, Ming.

In: Optics Letters, Vol. 44, No. 10, 15.05.2019, p. 2578-2581.

Research output: Contribution to journalArticle

Uddin, Nezam ; Liu, Guigen ; Sheng, Qiwen ; Han, Ming. / Constant temperature operation of fiber-optic hot-wire anemometers. In: Optics Letters. 2019 ; Vol. 44, No. 10. pp. 2578-2581.
@article{5b61fe3fd9be44d6b453f00bf7febda2,
title = "Constant temperature operation of fiber-optic hot-wire anemometers",
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.",
author = "Nezam Uddin and Guigen Liu and Qiwen Sheng and Ming Han",
year = "2019",
month = "5",
day = "15",
doi = "10.1364/OL.44.002578",
language = "English (US)",
volume = "44",
pages = "2578--2581",
journal = "Optics Letters",
issn = "0146-9592",
publisher = "The Optical Society",
number = "10",

}

TY - JOUR

T1 - Constant temperature operation of fiber-optic hot-wire anemometers

AU - Uddin, Nezam

AU - Liu, Guigen

AU - Sheng, Qiwen

AU - Han, Ming

PY - 2019/5/15

Y1 - 2019/5/15

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=85065986756&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85065986756&partnerID=8YFLogxK

U2 - 10.1364/OL.44.002578

DO - 10.1364/OL.44.002578

M3 - Article

C2 - 31090736

AN - SCOPUS:85065986756

VL - 44

SP - 2578

EP - 2581

JO - Optics Letters

JF - Optics Letters

SN - 0146-9592

IS - 10

ER -