| Abstract: | A sensor device is described herein, wherein the sensor device includes
an optical measurement system, such as an interferometer. The sensor
device further includes a low-power light source that is configured to
emit an optical signal having a constant wavelength, wherein accuracy of
a measurement output by the sensor device is dependent upon the optical
signal having the constant wavelength. At least a portion of the optical
signal is directed to a vapor cell, the vapor cell including an atomic
species that absorbs light having the constant wavelength. A
photodetector captures light that exits the vapor cell, and generates an
electrical signal that is indicative of intensity of the light that exits
the vapor cell. A control circuit controls operation of the light source
based upon the electrical signal, such that the light source emits the
optical signal with the constant wavelength. |