Instrumentation, Measurement, and Metrology

High-dynamic-range laser range finders based on a novel multimodulated frequency method

[+] Author Affiliations
Mang Ou-Yang

National Central University, Institute of Optical Sciences, Number 300, Jhongda Road, Jhongli City, Taoyuan County 320, Taiwan

Chen-Yi Huang

National Central University, Institute of Optical Sciences, Number 300, Jhongda Road, Jhongli City, Taoyuan County 320, Taiwan

Junewen Chen

Chung Hua University, Department of Mechanical Engineering, Number 707, Section 2, WuFu Road, Hsinchu City 300, Taiwan

Opt. Eng. 45(12), 123603 (December 19, 2006). doi:10.1117/1.2402517
History: Received January 09, 2006; Revised May 29, 2006; Accepted June 05, 2006; Published December 19, 2006
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A continuous-wave phase-shift laser range finder employs a novel multimodulation frequency method associating an undersampling analog-digital converter (ADC) with digital synchronous detection. This presentation greatly improves measured phase accuracy and reduces prior art scheme complexities. The novel patented design includes one phase-lock-loop (PLL) chip to produce a multimodulation frequency, one analog-to-digital converter operating at a low sampling rate, and an effective algorithm to calculate the final distance, which has encoded computing codes, and is implemented into compact computing circuits but without mixers and redundant components. The experimental results prove that a nonambiguity range is easily achieved to 1.5Km when the modulation frequency is operated at 0.1MHz. The measured accuracy approaches 2.9mm using the same apparatus when the modulation frequency is tuned to 14.5MHz. Dynamic range can reach 5.2×105 without a very high modulation frequency below 15 MHz, as revealed by a detailed analysis.

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© 2006 Society of Photo-Optical Instrumentation Engineers

Citation

Mang Ou-Yang ; Chen-Yi Huang and Junewen Chen
"High-dynamic-range laser range finders based on a novel multimodulated frequency method", Opt. Eng. 45(12), 123603 (December 19, 2006). ; http://dx.doi.org/10.1117/1.2402517


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