Abstract: A calibration method includes forming an external optical path, forming an internal optical path, and conducting a phase comparison between the second part of signals of the internal and external optical paths sequentially received by a second receiving device and the first part of signals of the internal and external optical paths sequentially received by a first receiving device. Two-way phase signals are outputted with part of a base reference being eliminated. Phase comparison is conducted again between the two-way signals with part of the base reference being eliminated, and the final phase signal is outputted with the base reference being eliminated. The distance-measuring device includes a transmitting device, first reflective surface, first and second receiving devices, first and second filters, and a phase detector.

Abstract: Provided are a calibration method based on dual-transmitting dual-receiving phase measurement and distance-measuring device, the calibration method comprising: step 1, forming an external optical path; step 2, forming an internal optical path; IN step 3, conducting a phase comparison between the second part of signals of the internal and external optical paths sequentially received by a second receiving device and the first part of signals of the internal and external optical paths sequentially received by a first receiving device, outputting two-way phase signals with part of a base reference being eliminated, conducting phase comparison again between the two-way signals with part of the base reference being eliminated, and outputting the final phase signal with the base reference being eliminated.

Abstract: The invention is applicable to the field of phase type photoelectric distance measurement and provides a calibration method based on phase measurement of a double-wavelength laser tube and a distance measurement device of the double-wavelength laser tube. The method comprises the following steps of: 1, forming an external optical path; 2, forming an internal optical path; and 3, sequentially switching a first light-wave and a second light-wave of light-wave transmitting devices (1 and 2) during operation of the steps 1 and 2 to compare phases of the sequentially-received light-waves of the internal and external optical paths through a receiving device (7), and outputting a phase signal for eliminating a base reference.

Abstract: Phase measurement calibrating method, calibrating device and ranging device based on the liquid crystal shutter principle are disclosed. A light wave is emitted by a light wave emitter (1) to a tested target through a first liquid crystal shutter (3). The light wave is reflected and returned from the tested target to be focused by an optical device, and is received by a receiver (7). The received light wave is used as the external light path beam of the measurement system. While the light wave is passing through the first liquid crystal shutter (3), a part of the light wave is reflected by the first liquid, crystal shutter (3) to pass through a second liquid crystal shutter (4). The light wave passing through the second liquid crystal shutter (4) is received directly by the receiver (7) and used as the internal light path beam for fundamental reference of the system phase measurement.

Abstract: Phase measurement calibrating method, calibrating device and ranging device based on the liquid crystal shutter principle are disclosed. A light wave is emitted by a light wave emitter (1) to a tested target through a first liquid crystal shutter (3). The light wave is reflected and returned from the tested target to be focused by an optical device, and is received by a receiver (7). The received light wave is used as the external light path beam of the measurement system. While the light wave is passing through the first liquid crystal shutter (3), a part of the light wave is reflected by the first liquid, crystal shutter (3) to pass through a second liquid crystal shutter (4). The light wave passing through the second liquid crystal shutter (4) is received directly by the receiver (7) and used as the internal light path beam for fundamental reference of the system phase measurement.