Optical sensor having external cavity laser outputting sensing and reference light
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United States of America Patent
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Feb 19, 2019
Grant Date -
Aug 24, 2017
app pub date -
Aug 26, 2016
filing date -
Feb 22, 2016
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Abstract
Disclosed is an optical sensor, including an external cavity laser configured to output sensing light and reference light; and a photodetector configured to detect a beating signal by an interference of the sensing light and the reference light output from the external cavity laser, in which the external cavity laser includes a reflecting filter including a sensing grating, to which a sensing object is attachable, and a reference grating, which is disposed on the same plane as that of the sensing grating, and outputs sensing light reflected from the sensing grating and reference light reflected from the reference grating. Accordingly, the optical sensor does not require a high-resolution spectroscope and has improved resolution and sensitivity.
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