Phase measurement method and application thereof

A phase measurement circuit, comprising:

• a receiver comprising a photoelectric converter operable to receive an optical signal and convert the optical signal into an electrical signal mixed with a mixed signal to generate an output signal wherein the photoelectric converter is supplied by a predetermined voltage;
• and
• a feedback calculator calculating an amplitude value in accordance with the output signal;
• when the amplitude value does not fall within the predetermined amplitude range, modifying the predetermined voltage to make the receiver re-receive the optical signal until the amplitude value falls within the predetermined amplitude range;
• when the amplitude value falls within the predetermined amplitude range, calculating a first phase value in accordance with the sampled signal and compensating the phase in accordance with whether the predetermined voltage has been modified or not.

A distance measurement system, comprising:

• an emitter, emitting a reference signal and emitting an optical signal;
• a first phase measurement circuit, receiving the reference signal to calculate a first phase value;
• and
• a second phase measurement circuit, receiving the optical signal reflected from a target object to calculate a second phase value, and calculating the distance between the distance measurement system and the target object in accordance with the phase difference between the first phase value and the second phase value;
• wherein the second phase measurement circuit comprising:
• a receiver comprising a photoelectric converter, receiving the optical signal and converting the optical signal into an electrical signal which mixes with a mixed signal to generate an output signal wherein the photoelectric converter is supplied by a predetermined voltage;
• and
• a feedback calculator, sampling the output signal to obtain a sampled signal with an amplitude value;
• when the amplitude value does not fall within the predetermined amplitude range, modifying the predetermined voltage to make the receiver re-receive the optical signal until the amplitude value falls within the predetermined amplitude range;
• when the amplitude value falls within the predetermined amplitude range, calculating a third phase value in accordance with the sampled signal and compensating the phase in accordance with whether the predetermined voltage has been modified or not.