Several studies have been conducted on measurements based on the self-coupling effect of semiconductor lasers. In these studies, the modulation of the optical output caused by the scattering of light from an object to the active layer is considered. This sensor based on the self-coupling effect can measure distance and velocity simultaneously. In this study, the theoretical equations for the measurement resolutions of a sensor that could measure distance and velocity simultaneously were obtained. In addition, the influence of the distance and velocity resolutions on the accuracy of the velocity measurement was investigated. The distance resolution of the sensor was determined based on the wavelength band of the semiconductor laser, whereas the velocity resolution was determined based on the modulation frequency.
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