G - Physics – 01 – S
Patent
G - Physics
01
S
G01S 17/08 (2006.01) G01S 17/36 (2006.01)
Patent
CA 2062660
An optical distance measuring apparatus wherein a processing system including a central processing unit and first and second local oscillating circuits serve to detect and calculate a phase difference between the electrical phase of a modulated signal outputted from a reference oscillator electrically connected to a light source via a modulating circuit and the electrical phase of a demodulated signal outputted from a demodulating circuit electrically connected to a light receiving portion. Distance between the apparatus and an object is measured based on the detected phase difference with reference to the electrical phase of a reference signal outputted from a reference oscillator. A first local oscillating signal is outputted from the first local oscillating circuit and it is then subjected to frequency conversion together with the demodulated signal in a mixer so as to output a first intermediate frequency, while a second local oscillating signal is outputted from the second local oscillating circuit and it is then subjected to frequency conversion in a mixer together with the demodulated signal so as to output a second intermediate frequency signal. One of the first and second intermediate frequency signals is selected depending on the present distance between the apparatus and the object to be measured.
Iwasaki Kazuhisa
Kimura Shigeru
Kitamura Hideki
Ohmamyuda Yukio
Senoo Yasushi
Fetherstonhaugh & Co.
Stanley Electric Co. Ltd.
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