Patent ID: 11879975
Assignee: MITUTOYO CORPORATION
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 2:
3. The measurement apparatus according to claim 2, wherein the beat signal generation part generates two beat signals, which are (i) a first beat signal due to the reflected light of the measurement light and the reference light and (ii) a second beat signal due to the end-face reflected light and the reference light,
the frequency analyzing part outputs, as a distance measurement signal, a signal which is obtained by converting a signal in which the two beat signals generated by the beat signal generation part are superposed into a frequency domain signal, and
the frequency analyzing part subtracts a frequency spectrum of the reference beat signal based on the end-face reflected light from a frequency spectrum of the distance measurement signal by subtracting a signal level of the reference frequency signal from a signal level of the distance measurement signal for each frequency.