CALIBRATION METHOD AND DISTANCE MEASUREMENT DEVICE THEREOF BASED ON PHASE MEASUREMENT OF DOUBLE-WAVELENGTH LASER TUBE

摘要

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. By the method, aims of phase compensation and calibration are fulfilled, uncertain phase noise which is introduced into a circuit due to environmental change is eliminated, the distance measurement accuracy of laser is improved, the influence of environmental factors on a distance measurement error is reduced, the cost of a system is reduced, and application of a phase type photoelectric distance measurement system in various industries is enhanced.

主权项

1. A calibration method based on phase measurement of double-wavelength laser tube, wherein: the said method includes the following steps:
Step 1 is the formation of external optical path: the light-emitting device of the system emitting the first light-wave through the first filter to the measured object, the said light-wave focused by the optical device after reflecting back by the measured object, then being received by the receiving device and as a measured external optical path of the system; The said light-wave through the a first filter, while some light-wave energy is reflected to the receiving device by the filter or other reflective film and filter by the second filter; Step 2 is the formation of internal optical path: the light-emitting device of the system emitting the second light-wave filter by the first filter and the said filter or other reflective film reflected to the receiving device and through the second filter received by the said receiving device directly, wherein the light-wave through the second filter will be the base reference internal optical path of the phase measurement system; Step 3: when Steps 1 and 2 is working, the first light-wave and the second lightwave obtained by the light-emitting device switching successively, the said receiving device proceed phase comparison with the internal, external optical path received successively is made, and outputting the phase signal which eliminates the base reference.