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Review
. 2021 Apr 8;4(1):8.
doi: 10.1186/s42492-021-00074-0.

Ultrasonic signal detection based on Fabry-Perot cavity sensor

Wu Yang  1 , Chonglei Zhang  2 , Jiaqi Zeng  1 , Wei Song  1
Affiliations
Review

Ultrasonic signal detection based on Fabry-Perot cavity sensor

Wu Yang et al. Vis Comput Ind Biomed Art. .

Erratum in

Abstract

Acoustic/ultrasonic sensors are devices that can convert mechanical energy into electrical signals. The Fabry-Perot cavity is processed on the end face of the double-clad fiber by a two-photon three-dimensional lithography machine. In this study, the outer diameter of the core cladding was 250 μm, the diameter of the core was 9 μm, and the microcavity sensing unit was only 30 μm. It could measure ultrasonic signals with high precision. The characteristics of the proposed ultrasonic sensor were investigated, and its feasibility was proven through experiments. Its design has a small size and can replace a larger ultrasonic detector device for photoacoustic signal detection. The sensor is applicable to the field of biomedical information technology, including medical diagnosis, photoacoustic endoscopy, and photoacoustic imaging.

Keywords: Acoustic sensor; Double-clad fiber; Endoscopic photoacoustic imaging; Fabry–Perot microcavity; Full-optical detection; Two-photon 3D lithography machine.

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Conflict of interest statement

The authors declare that they have no competing interests.

Figures

Fig. 1
Fig. 1
(a) Schematic diagram of ultrasound detection based on the F–P cavity. The red area is the fiber core, the light blue area is the first inner cladding of the fiber, and the yellow area is the gold film formed by gold plating on the end face of the fiber. In addition, the arc part is the structure made of photoresist, and the F–P cavity is formed with the end face of the fiber. (b) Pattern layout of the F–P cavity using design software to create a model diagram corresponding to the arc-shaped part of (a)
Fig. 2
Fig. 2
Two-photon lithography using a 3D direct-laser-writing (DLW) system (Photonic Professional GT, Nanoscribe). a Left: Cross-section of the processed structure. Upper right: End face of the processed structure. b Left: Schematic diagram of the actual machining model. Right: Local enlarged figure in the dotted line box of the left figure
Fig. 3
Fig. 3
Schematic diagram of the F–P mode system. The 1550 nm fiber laser is connected with toroidal port 1 through a flange device. Interface port 3 is connected with the optical fiber. The optical intensity change returned by the detection light through the F–P cavity interference of the optical fiber is received by the photoelectric detector, and the test results are obtained after amplification and acquisition processing. PD: Photoelectric detector; DAQ: Data collection card; PC: Personal computer
Fig. 4
Fig. 4
Frequency response calibration: F–P measured time-domain signal. The fiber is placed vertically and inserted into the tank, as shown in Fig. 3. The bottom of the tank is a layer of transparent film, and the bottom of the cling film is the ultrasonic transducer, which is vertically upward relative to the optical fiber. The distance between the end face of the optical fiber and the transducer is approximately 1 mm. The signal is measured by adjusting the distance and coupling angle between the transducer and the optical fiber
See this image and copyright information in PMC

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