Small displacement measurement by optical heterodyne narrow band detection

[in Chinese]; [in Chinese]; [in Chinese]; [in Chinese]; [in Chinese]

Journals >Chinese Journal of Lasers >Volume 18 >Issue 2 >Page 139 > Article

Chinese Journal of Lasers
Vol. 18, Issue 2, 139 (1991)

Small displacement measurement by optical heterodyne narrow band detection

[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]

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[in Chinese]

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[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese]. Small displacement measurement by optical heterodyne narrow band detection[J]. Chinese Journal of Lasers, 1991, 18(2): 139 Copy Citation Text

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Abstract

Two methods for measuring small vibration displacement are reported. The sensitivity of small displacement of optical heterodyne amplitude narrow band de ection reaches 5.2×10-4 nm(2 kHz signal).The amplitude detection method is comparedwith the phase detection method by measuring noise spectrum.

Keywords

narrow band detection optical heterodyne phase detection optical heterodyne amplitude detection

[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese]. Small displacement measurement by optical heterodyne narrow band detection[J]. Chinese Journal of Lasers, 1991, 18(2): 139

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