Laser precision ranger based on beat-wave interferometry
This paper presents a laser precision ranger based on beat wave interferometry. A frequency-stabilized double longitudinal modes He-Ne laser with thermoregulation is used as the light source. The two beams of double longitudinal modes generated in the same resonator of the laser are naturally coaxial. They have a frequency difference of about 790MHz and a beat wavelength of 380mm. Their stability is the same as the laser, which is better than 10-7 in open air. The node of the beat wave is used as the sampling flag. An adaptive filter and a wavelet transform program are used to eliminate the noise and to improve the accuracy of node detection. The distance between the node and the measur ed point is measured with a double frequency interferometer, which is incorporated in the same optical system and has a resolution of 0.08μm. Experimental results indicate that the measuring range is 20m and the uncertainty 30μm /10m.
Ranger beat-wave double longitudinal modes node uncertainty
Tao Zhang Yanhua Wu Huang Weia
Institute of Applied Laser, Sichuan University, Chengdu 610065, China State Key Laboratory of Hydraulics, Sichuan University, Chengdu 610065, China
国际会议
第五届仪器科学与技术国际学术会议(ISIST 2008)Fifth International Symposium on Instrmentation Science and Technology
沈阳
英文
1-8
2008-09-15（万方平台首次上网日期，不代表论文的发表时间）