Instrumentation, Techniques, and Measurement

Nondisturbing transverse acoustic sensor based on weak measurement in Mach–Zehnder interferometer

[+] Author Affiliations
Dongmei Li, Tian Guan, Yonghong He

Tsinghua University, Shenzhen Key Laboratory for Minimal Invasive Medical Technologies, Institute of Optical Imaging and Sensing, Graduate School at Shenzhen, Shenzhen, China

Tsinghua University, Department of Physics, Beijing, China

Jingying Jiang

Tianjin University, Tianjin Key Laboratory of Biomedical Detecting Techniques and Instruments, College of Precision Instruments & Opto-electronics Engineering, Tianjin, China

Opt. Eng. 56(3), 034107 (Mar 20, 2017). doi:10.1117/1.OE.56.3.034107
History: Received December 2, 2016; Accepted March 2, 2017
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Abstract.  We proposed an optical sensing scheme, based on the mechanism of weak measurement, to detect the sonic pressure transversally without any disturbance. According to the theory of weak measurement in frequency domain, a tiny phase difference between the two eigenstates of the system could be detected, depending on the shift of central wavelength of output spectra. The optical path difference between two paths of a Mach–Zehnder interferometer is induced by the varied acoustic waves propagating in liquid. The propagating direction of the testing light beam is orthogonal to that of the acoustic wave. Thus, the phase shift corresponding to the changing acoustic pressure could be monitored transversally. The experiment with the hydrophone is implemented as a reference to demonstrate the feasibility and authenticity of this weak measurement scheme. With this method, an optical phase resolution of 1.12×105  rad was acquired in such a weak measurement system.

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© 2017 Society of Photo-Optical Instrumentation Engineers

Citation

Dongmei Li ; Tian Guan ; Jingying Jiang and Yonghong He
"Nondisturbing transverse acoustic sensor based on weak measurement in Mach–Zehnder interferometer", Opt. Eng. 56(3), 034107 (Mar 20, 2017). ; http://dx.doi.org/10.1117/1.OE.56.3.034107


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