Fiber-optic Michelson interferometer fixed in a tilted tube for direction-dependent ultrasonic detection

Gang, Tingting; Hu, Manli; Qiao, Xueguang; Li, JiaCheng; Shao, Zhihua; Tong, Ruizhan; Rong, Qiangzhou

doi:10.1016/j.optlaseng.2016.06.024

Cited by 31 publications

(8 citation statements)

References 22 publications

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“…Compared with piezoelectric transducer, cantilever beam, tuning fork and other ultrasonic sensors, the newly emerged optical fiber ultrasonic sensors have advantages of small size, wide bandwidth, and high sensitivity [10]. In 2017, Gang et al [11] proposed a miniature compact Michelson interferometer, which completed a highly sensitive detection of 100~300 kHz ultrasound wave using a gold film deposit fiber tip. Another Fabry-Perot interferometer (FPI) ultrasonic transducer achieved noise equivalent sound pressure as low as 2 Pa and a bandwidth of -6 dB greater than 22.5 MHz, but the consistency is an issue for FPI ultrasonic sensor, Moreover, its demodulation usually depends on a narrow linewidth tunable laser with high cost [12].…”

Section: Introductionmentioning

confidence: 99%

Measurement of the Acoustic Relaxation Absorption Spectrum of CO<sub>2</sub> Using an Optical Fiber DBR Laser

Shen¹,

Yuan²,

Li³

et al. 2023

Preprint

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Reconstruction of acoustic relaxation absorption curve is a powerful approach to ultrasonic gas sensing, but requires known of a series ultrasonic absorption at various frequencies around effective relaxation frequency. Ultrasonic transducer is a most widely deployed sensor for ultrasonic wave propagation measurement and works only at a fixed frequency or specific environment like water, so a large number of ultrasonic transducers operating at various frequencies are required to recover an acoustic absorption curve with a relative large bandwidth, which cannot suit for large-scale practical applications. This paper proposes a wideband ultrasonic sensor using a distributed Bragg reflector (DBR) fiber laser for gas concentration detection through acoustic relaxation absorption curve reconstruction. With a relative wide and flat frequency response, the DBR fiber laser sensor measures and restores a full acoustic relaxation absorption spectrum of CO2 using a decompression gas chamber between 0.1 and 1 atm to accommodate the main molecular relaxation processes, and interrogates with a non-equilibrium Mach-Zehnder (M-Z) interferometer to gain a sound pressure sensitivity of -45.4 dB. The measurement error of the acoustic relaxation absorption spectrum is less than 1.32%.

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Section: Introductionmentioning

confidence: 99%

Measurement of the Acoustic Relaxation Absorption Spectrum of CO<sub>2</sub> Using an Optical Fiber DBR Laser

Shen¹,

Yuan²,

Li³

et al. 2023

Preprint

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“…In recent years, however, many steps forward have been made and tools are presently available that can detect ultrasonic waves even in the presence of non-reflective surfaces and with a certain roughness. Interferometers (Michelson’s variant, in their simplest form 17 , 18 ) are based on the interference between the optical beam emitted by the instrument and the optical beam reflected from the surface to be inspected. Vibrometers represent a particular type of interferometers based on the Doppler effect (laser Doppler vibrometers 19 ): for effective ultrasound detection, the emitted laser beam is immediately split into two beams, one with an additional frequency component resulting from the passage through an acousto-optic modulator; the differences between the two beams in frequency terms, more evident because of the preliminary passage in the modulator, provide the speed of the particles on the surface rather than their displacement.…”

Section: Introductionmentioning

confidence: 99%

Non-contact ultrasonic inspection by Gas-Coupled Laser Acoustic Detection (GCLAD)

Gulino

Bruzzi

Caron

et al. 2022

Sci Rep

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Gas-Coupled Laser Acoustic Detection (GCLAD) is an ultrasonic, non-contact detection technique that has been recently proven to be applicable to the inspection of mechanical components. GCLAD response raises as the intersection length between the probe laser beam and the acoustic wavefront propagating in the air increases; such feature differentiates the GCLAD device from other optical detection instruments, making it a line detection system rather than a point detector. During the inspection of structures mainly extending in two dimensions, the capability to evidence presence of defects in whichever point over a line would enable moving the emitter and the detector along a single direction: this translates in the possibility to decrease the overall required time for interrogation of components compared to point detectors, as well as generating simpler automated monitoring layouts. Based on this assumption, the present study highlights the possibility of employing the GCLAD device as a line inspection tool. To this end, preliminary concepts are provided allowing maximization of the GCLAD response for the non-destructive testing of components which predominantly extend in two dimensions. Afterwards, the GCLAD device is employed in pulse-echo mode for the detection of artificial defects machined on a 12 mm-thick steel plate: the GCLAD probe laser beam is inclined to be perpendicular to the propagation direction of the airborne ultrasound, generated by surface acoustic waves (SAWs) in the solid which are first reflected by the defect flanks and subsequently refracted in the air. Numerical results are provided highlighting the SAW reflection patterns, originated by 3 mm deep surface and subsurface defects, that the GCLAD should interpret. The subsequent experimental campaign highlights that the GCLAD device can identify echoes associated with surface and subsurface defects, located in eight different positions on the plate. B-scan of the component ultimately demonstrates the GCLAD performance in accomplishing the inspection task.

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“…The fiber optic-based ultrasonic sensors detect UWs through high-speed recording of the intensity, wavelength, phase, and polarization of light propagating through optical fibers. Previously reported fiber optic-based ultrasonic sensors mainly include intensity modulation of fiber optic sensors (IMFOS), interferometric fiber optic sensors (IFOS), and fiber optic grating sensors (FOGS) [ 10 ]. Although IMFOS have shown high sensitivity and broadband frequency response in the detection of UW, they still have some shortcomings, such as poor stability of the UW detection and low signal-to-noise ratio (SNR) and single-point detection [ 11 , 12 ].…”

Section: Introductionmentioning

confidence: 99%

A Submerged Optical Fiber Ultrasonic Sensor Using Matched Fiber Bragg Gratings

Gang

et al. 2018

Sensors

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A novel kind of fiber optic ultrasonic sensor based on matching fiber Bragg gratings (FBGs) is proposed and demonstrated. The sensors consist of a pair of matching FBGs fixed to a special bracket. The bracket plays a role in stretching and squeezing the FBGs, with the push–pull effect efficiently coupling the ultrasonic signal to the sensor, thus, improving the sensor’s sensitivity. Side-band filtering technology-based intensity interrogation was used to detect ultrasounds in water. With the synergic effect of the matching FBGs, the sensor performed with a high signal-to-noise ratio (56.9 dB at 300 KHz, 53 dB at 1 MHz and 31.8 dB at 5 MHz) and the observed ultrasonic sinusoidal signals were undistorted and distinguishable in the time domain.

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Fiber-optic Michelson interferometer fixed in a tilted tube for direction-dependent ultrasonic detection

Cited by 31 publications

References 22 publications

Measurement of the Acoustic Relaxation Absorption Spectrum of CO<sub>2</sub> Using an Optical Fiber DBR Laser

Measurement of the Acoustic Relaxation Absorption Spectrum of CO<sub>2</sub> Using an Optical Fiber DBR Laser

Non-contact ultrasonic inspection by Gas-Coupled Laser Acoustic Detection (GCLAD)

A Submerged Optical Fiber Ultrasonic Sensor Using Matched Fiber Bragg Gratings

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