Pseudoheterodyne detection scheme for optical interferometers
DA Jackson, AD Kersey, M Corke, JDC Jones - Electronics letters, 1982 - IET
DA Jackson, AD Kersey, M Corke, JDC Jones
Electronics letters, 1982•IET… Unfortunately conventional heterodyne detection also requires additional bulky
expensive optical components such as Bragg cells6 to produce the carrier signal in the
interferometer output. In this letter we describe a novel pseudoheterodyne detection
scheme which does not require any additional optical components to produce the
heterodyne offset frequency. The scheme makes use of the fact that a moving fringe pattern
can be created by ramping the absolute frequency of the laser source in an unbalanced …
expensive optical components such as Bragg cells6 to produce the carrier signal in the
interferometer output. In this letter we describe a novel pseudoheterodyne detection
scheme which does not require any additional optical components to produce the
heterodyne offset frequency. The scheme makes use of the fact that a moving fringe pattern
can be created by ramping the absolute frequency of the laser source in an unbalanced …
A heterodyne signal recovery scheme for interferometric sensors based on frequency ramping of the laser diode source is described. Using a PLL detector, signals in the range 10−4 to 6 rad have been recovered, the system being linear over 5 decades.
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