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Underwater distance high-precision measurement method based on dual-optical comb interference

A measurement method, dual-comb technology, applied in the direction of measurement devices, radio wave measurement systems, electromagnetic wave re-radiation, etc., can solve the problems of limited distance and measurement accuracy, affecting measurement accuracy, and enlarged sound beam diameter. Achieve fast underwater distance measurement, high stability, and improved measurement accuracy

Inactive Publication Date: 2018-11-23
TIANJIN UNIV
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  • Summary
  • Abstract
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  • Application Information

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Problems solved by technology

[0003] According to the time-of-flight method of acoustic flight, the sound beam has a serious divergence problem during the flight, and the diameter of the sound beam will gradually increase, which will affect the measurement accuracy to a certain extent; speed of propagation, making it less efficient to measure
For the underwater distance measurement method based on visual imaging, the measurable distance and measurement accuracy are relatively limited

Method used

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  • Underwater distance high-precision measurement method based on dual-optical comb interference
  • Underwater distance high-precision measurement method based on dual-optical comb interference
  • Underwater distance high-precision measurement method based on dual-optical comb interference

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Experimental program
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Embodiment 1

[0052] The embodiment of the present invention introduces a new method for measuring underwater distance based on the basic principle of dual-comb interference, which uses dual-comb interference to quickly scan, and the phenomenon has high resolution. The purpose is to achieve high precision, High stability, fast underwater distance measurement, see figure 1 , figure 2 The method includes the following steps:

[0053] 101: Using frequency doubling crystals (SHG) doubles the frequency of light, and the wavelength becomes half of the original wavelength (water has a strong absorption effect on 1030nm light);

[0054] Such as figure 2 As shown, the light emitted by the first self-made optical comb 1 and the second self-made optical comb 2 are respectively directly connected to the first frequency doubling crystal 3 and the second frequency doubling crystal 4 for frequency doubling. After frequency doubling by the first frequency doubling crystal 3 and the second frequency do...

Embodiment 2

[0066] Combine below figure 1 , figure 2 and image 3 The scheme in Example 1 is further introduced, see the following description for details:

[0067] The first self-made optical comb 1 and the second self-made optical comb 2 (1030nm) are respectively passed through the first frequency doubling crystal 3 and the second frequency doubling crystal 4 so that the optical frequency is doubled, and the wavelength becomes 1 / 2 of the original wavelength (water It has a strong absorption effect on 1030nm light);

[0068] One set of the double optical comb is the reference light 11 (corresponding to the second self-made optical comb 2), and the other set is the measuring light 10 (corresponding to the first self-made optical comb 1). The frequency-doubled measurement light is divided into two vertical beams by the first beam splitter 6, in which the reflected light 61 is incident on the fixed mirror 5 and returns to the first beam splitter 6 along the original path, and the transm...

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Abstract

The present invention discloses an underwater distance high-precision measurement method based on dual-optical comb interference. The method comprises the following steps of: after light emitted by afirst home-made optical comb and a second home-made optical comb is subjected to frequency doubling, dividing measurement light into first reflection light and second reflection light through a firstlight splitter, allowing the first reflection light to pass through a fixed reflector to be second reflection light, returning the second reflection light to the first light splitter, allowing the first transmission light to pass through a cube-corner prism at a target to be measured to be third reflection light, returning the third reflection light to the first light splitter, performing beam combination of the third reflection light and the second reflection light to become a combined beam of two beams of light; allowing the combined beam of the two beams of light to pass through the secondlight splitter, and performing beam combination of the two beams of light and the second transmission light in the reference light through the second light splitter to become three beams of light of the combined beam; transmitting the combined beam of the three beams of the light into a photoelectric detector to convert the optical signals to electrical signals to obtain generation moments of twointerference fringes so as to obtain the interference time difference to obtain a distance to be measured. The underwater distance high-precision measurement method can achieve high-precision, high-stability and rapid underwater distance measurement.

Description

technical field [0001] The invention relates to the field of underwater distance measurement based on dual-comb interference (that is, two-beam femtosecond laser interference), in particular to a high-precision underwater distance measurement method based on dual-comb interference. Background technique [0002] Specifically, for underwater distance measurement, there are generally two types of methods, one is to measure the flight time of the sound wave to the target to be measured, and then measure the underwater distance according to the relationship between time, speed and distance; Vision imaging technology for distance measurement. [0003] According to the time-of-flight method of acoustic flight, the sound beam has a serious divergence problem during the flight, and the diameter of the sound beam will gradually increase, which will affect the measurement accuracy to a certain extent; Propagation velocity, resulting in low measurement efficiency. For the underwater d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S17/08
CPCG01S17/08
Inventor 翟京生薛彬王志洋张凯张好运陈阳杨晓霞吴翰钟
Owner TIANJIN UNIV
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