Ultrasonic Sensitivity-Improved Fabry–Perot Interferometer Using Acoustic Focusing and Its Application for Noncontact Imaging

Rong, Qiangzhou; Zhou, Ruixiang; Hao, Yongxin; Yin, Xiaolei; Shao, Zhihua; Gang, Tingting; Qiao, Xueguang

doi:10.1109/jphot.2017.2702719

Cited by 35 publications

(16 citation statements)

References 31 publications

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“…From Equation 9, it can be seen that η will equal ν when I 1 equals I 2 . Consequently, the degradation coefficient η can be measured through Equation (8). To make I 1 equal to I 2 , three steps should be followed: (1) Remove the FRM and record the results of the PDs.…”

Section: Performance Of Depolarization Fading With Self-designed Probementioning

confidence: 99%

“…After the above three steps were implemented, three outputs of the PDs were acquired to measure the degradation coefficient η of three interference signals. The maximum and minimum of the interference intensity were acquired every 6 ms and the visibility was calculated according to Equation (8). First, the measured results were obtained under the condition with a Faraday rotator.…”

Section: Performance Of Depolarization Fading With Self-designed Probementioning

confidence: 99%

“…It can accurately measure physical parameters such as pressure [1], strain [2], temperature [3,4], displacement [5,6], amongst others. Fiber interferometry is widely used to monitor the health of large steel structures [7], underwater acoustic detection [8], biomedical imaging [9,10], etc. There are polarization and phase fading problems in most fiber interferometers, and many methods have been proposed to solve these problems.…”

Section: Introductionmentioning

confidence: 99%

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Research on Polarization and Phase Fading Compensation in Michelson Interferometer Based on 3 × 3 Coupler and Novel Probe with Built-in Faraday Rotator

2019

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A self-designed probe and a feedback control scheme based on the Michelson interferometer with a 3 × 3 fiber coupler are proposed. A 45° Faraday rotator is built into the self-designed probe, and a feedback control scheme is used to judge the direction of increase or decrease for the phase compensation, so as to solve the problems of polarization and phase fading. In addition, a result-normalized method is applied in a micro-vibration measurement experiment. The experimental interferometer system achieves a high frequency of 1 MHz micro-vibration. The normalized results keep stable with a maximum deviation from the mean of 1.9% when the power of light reflected back into the self-designed probe is altered. Applied research is carried out by detecting the displacement due to a photoacoustic wave. Therefore, the experimental interferometer system is available for the practical application of micro-displacement measurements, noncontact high-frequency detection, and point-by-point image scanning in biological tissue.

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Section: Performance Of Depolarization Fading With Self-designed Probementioning

confidence: 99%

Section: Performance Of Depolarization Fading With Self-designed Probementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Research on Polarization and Phase Fading Compensation in Michelson Interferometer Based on 3 × 3 Coupler and Novel Probe with Built-in Faraday Rotator

2019

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“…The sensitivity of the FPI is determined by the structure and material of the interferometer cavity [ 27 ]. Their low reflectance and multilayer structure result in a low signal-to-noise ratio (SNR) and the manufacturing process is complex [ 28 ]. It can only achieve point-based measurement.…”

Section: Introductionmentioning

confidence: 99%

Partial Discharge Ultrasound Detection Using the Sagnac Interferometer System

Wang

Gao

et al. 2018

Sensors

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Partial discharge detection is crucial for electrical cable safety evaluation. The ultrasonic signals frequently generated in the partial discharge process contains important characteristic information. However, traditional ultrasonic transducers are easily subject to strong electromagnetic interference in environments with high voltages and strong magnetic fields. In order to overcome this problem, an optical fiber Sagnac interferometer system is proposed for partial discharge ultrasound detection. Optical fiber sensing and time-frequency analysis of the ultrasonic signals excited by the piezoelectric ultrasonic transducer is realized for the first time. The effective frequency band of the Sagnac interferometer system was up to 175 kHz with the help of a designed 10 kV partial discharge simulator device. Using the cumulative histogram method, the characteristic ultrasonic frequency band of the partial discharges was between 28.9 kHz and 57.6 kHz for this optical fiber partial discharge detection system. This new ultrasound sensor can be used as an ideal ultrasonic source for the intrinsically safe detection of partial discharges in an explosive environment.

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“…Fiber-optic ultrasonic sensors have many advantages [ 2 , 3 , 4 ] compared with traditional electrical ultrasonic transducers, including a capacity to detect broad-band acoustic wave signals with high sensitivity and resist disturbance; good reusability; and improvement of the reliability and efficiency of ultrasonic detection. All these advantages are beneficial to improve the reliability and efficiency of imaging of seismic physical models (SPMs) [ 5 ]. The SPM is used to simulate the real geological structure in laboratories, which can set up a bridge between theories and field-scale experiments.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity-Improved Ultrasonic Sensor for 3D Imaging of Seismic Physical Model Using a Compact Microcavity

Gang

et al. 2018

Sensors

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A sensitivity-improved ultrasonic sensor is proposed and demonstrated experimentally in this present study. The device is comprised only a fiber-optic microcavity that is formed by discharging a short section of hollow core fiber (HCF). The key to ensuring the success of the sensor relies on the preprocessing of hydrogen loading for HCF. When discharging the HCF, the hydrogen is heated up during the formation of the air bubble, which enlarges the bubble diameter, smoothens its surfaces simultaneously and decreases Young’s modulus of the material of the bubble. Ultimately, this results in the probe being highly sensitive to ultrasound with a SNR of 69.28 dB. Once the compact air cavity is formed between the end face of the leading-in fiber and the top wall of the bubble, a well-defined interference spectrum is achieved based on the Fabry–Perot interference. By using spectral side-band filtering technology, we detect the ultrasonic waves reflected by the seismic physical model (SMF) and then reconstruct its three-dimensional image.

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Ultrasonic Sensitivity-Improved Fabry–Perot Interferometer Using Acoustic Focusing and Its Application for Noncontact Imaging

Cited by 35 publications

References 31 publications

Research on Polarization and Phase Fading Compensation in Michelson Interferometer Based on 3 × 3 Coupler and Novel Probe with Built-in Faraday Rotator

Research on Polarization and Phase Fading Compensation in Michelson Interferometer Based on 3 × 3 Coupler and Novel Probe with Built-in Faraday Rotator

Partial Discharge Ultrasound Detection Using the Sagnac Interferometer System

Sensitivity-Improved Ultrasonic Sensor for 3D Imaging of Seismic Physical Model Using a Compact Microcavity

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