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Large-scale multi-pulse modulation femto-second laser absolute distance measurement device and method

A ranging device and femtosecond laser technology, applied in the field of femtosecond laser ranging, can solve the problems of small repetition frequency scanning range, complex structure, dead zone of target distance, etc., and achieve increased repetition frequency scanning range and simple optical structure. , the effect of improving the accuracy

Active Publication Date: 2018-03-06
BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA
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  • Application Information

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Problems solved by technology

[0004] In summary, the femtosecond laser ranging method in the prior art has the following disadvantages: complex structure, small repetition rate scanning range, dead zone near the target distance, etc.

Method used

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  • Large-scale multi-pulse modulation femto-second laser absolute distance measurement device and method
  • Large-scale multi-pulse modulation femto-second laser absolute distance measurement device and method
  • Large-scale multi-pulse modulation femto-second laser absolute distance measurement device and method

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Embodiment 1

[0047] Such as figure 1 As shown, a femtosecond laser absolute distance measuring device disclosed in this embodiment includes a femtosecond laser light source, an atomic clock, a Michelson interference distance measuring device, a wave plate HWP4, a polarization beam splitter PBS, a balanced optical mutual Associated components, photoelectric detection equipment, servo control equipment and frequency counters.

[0048] The femtosecond laser light source is used to provide a stable light source to the optical measurement system;

[0049] The Michelson interferometric ranging device is used to generate the distance to be measured;

[0050] The wave plate HWP4 is used to ensure that the orthogonal polarization direction of the light pulse from the Michelson interference ranging device coincides with the polarization direction of the polarization beam splitter prism PBS;

[0051] The balanced optical cross-correlation component is used to extract a balanced optical cross-correl...

Embodiment 2

[0093] Such as figure 1 As shown, a femtosecond laser absolute ranging device and method disclosed in this embodiment is characterized in that a femtosecond laser can be used to achieve accurate measurement of any distance, and the optical structure is simple, which can avoid traditional The system complexity of dual femtosecond laser ranging; and by locking the femtosecond pulse repetition frequency to the atomic clock, thereby improving the accuracy of the measurement, making the length measurement directly traceable to a well-defined time standard, reducing the traditional dual femtosecond laser ranging pulse Uncertainty due to time jitter. By adding a single-mode fiber with a known length, a reference can be provided to increase the repetition frequency scanning range, thereby effectively avoiding the dead zone near the target distance. Taking a femtosecond laser of 100MHz as an example, the nominal displacement of PZT reaches tens of microns. Taking a PZT with a nominal ...

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Abstract

The invention discloses a large-scale multi-pulse modulation femto-second laser absolute distance measurement device and method and belongs to the field of femto-second laser distance measurement. According to the invention, the device includes a femto-second laser source, an atomic clock, a Michelson interferometry ranging device, a wave plate HWP4, a PBS (Polarized Beam Splitter), a balance optical cross-correlation assembly, a photoelectric detection device, a servo control device and a frequency counter. The device also includes a single-mode long optical fiber in a length m and a wave plate HWP5. The invention also discloses the large-scale multi-pulse modulation absolute distance measurement method implemented based on the femto-second laser absolute distance measurement device. According to the invention, the length of a reference arm in the Michelson interferometry ranging device is not needed to know and absolute distance measurement of a continuous range based on a flight time method is realized. The application range of femto-second laser absolute distance measurement can be expanded and the invention has a good application prospect in engineering fields such as femto-second laser distance measurement and the like.

Description

technical field [0001] The invention belongs to the field of femtosecond laser distance measurement, in particular to a femtosecond laser absolute distance measurement device and method for large-scale repetition frequency modulation. Background technique [0002] Typical length (or distance) measurement methods are generally divided into two types. The first method is an incoherent measurement method based on optical pulse counting, that is, the time-of-flight method. Its principle is realized by measuring the round-trip time interval of the pulse signal. Due to the limited rate of measurement, time-of-flight measurements using laser pulses cannot achieve micron-scale resolution. The second method is a coherent light measurement method based on the principle of interference, namely laser interferometry. The principle is to calculate the displacement increment through phase accumulation. Although this method has good accuracy and resolution, it is not suitable for absolut...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/02G01S17/08
Inventor 武腾飞王少峰韩继博
Owner BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA
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