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All-fiber bidirectional mode-locked femtosecond laser ranging device based on time domain scanning and method thereof

A technology of femtosecond laser and distance measuring device, which is applied in the direction of measuring device, electromagnetic wave re-radiation, radio wave measuring system, etc., can solve the problems of measurement dead zone and limited range of repetition frequency adjustment, and achieve high measurement accuracy and reduce Auxiliary measuring equipment, effect of size reduction

Active Publication Date: 2018-06-19
BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA
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Problems solved by technology

For a certain distance to be measured, this method needs to phase lock two repetition frequencies, and the adjustment range of the repetition frequency is limited, so this method is not suitable for short-distance measurement, and there is a measurement dead zone

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  • All-fiber bidirectional mode-locked femtosecond laser ranging device based on time domain scanning and method thereof
  • All-fiber bidirectional mode-locked femtosecond laser ranging device based on time domain scanning and method thereof
  • All-fiber bidirectional mode-locked femtosecond laser ranging device based on time domain scanning and method thereof

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Embodiment Construction

[0025] The implementation of the present invention will be described in detail below in conjunction with the drawings and examples.

[0026] Such as figure 1 As shown, the all-fiber bidirectional mode-locked femtosecond laser ranging device based on time-domain scanning includes a light source, an optical measurement device, and a data acquisition and processing device.

[0027] Such as figure 2 As shown, the light source is a free-running all-fiber bidirectional passively mode-locked ring femtosecond laser, which emits bidirectional pulses with a small repetition frequency difference, where the repetition frequency of the forward pulse is f r , the repetition frequency of the reverse pulse is (f r +Δf r ). The forward pulse is amplified and compressed through the erbium-doped fiber amplifier 1 and the dispersion compensating fiber 2 . After the light pulse passes through the first half-wave plate 3, it is split into two beams of light pulses with vertical polarization a...

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Abstract

The invention relates to an all-fiber bidirectional mode-locked femtosecond laser ranging device based on time domain scanning and a method thereof, and belongs to the field of laser ranging. The forward pulse emitted by a light source is divided into a beam of reference light pulse and a beam of measuring light pulse through a Michelson interference unit; the reverse pulse emitted by the light source scans the reference light pulse and the measuring light pulse emitted by the Michelson interference unit through a pulse scanning unit so as to generate a ranging signal; and a data acquisition and processing device can obtain the distance value to be measured according to the ranging signal and the repetition frequency value measured by a frequency counter. Compared with the double optical comb ranging device, one laser producing the bidirectional pulses is applied to substitute the optical comb by the device without adjusting the repetition frequency so that the measuring structure canbe optimized, the measuring auxiliary equipment can be greatly reduced, the volume of the ranging device can be reduced, the cost can be saved and the stability can be enhanced.

Description

technical field [0001] The invention relates to an all-fiber bidirectional mode-locked femtosecond laser ranging device and method based on time-domain scanning, and belongs to the field of laser ranging. Background technique [0002] Typical distance measurement is generally divided into two methods. The first method is the time-of-flight method. The principle of the time-of-flight method is realized by measuring the round-trip time interval of pulses. The time-of-flight method has the advantage of a wide range of distance measurement, which can generally measure several meters to hundreds of kilometers. However, the time resolution of the detector can only reach the level of picoseconds, so the measurement accuracy and resolution are limited. The second method is laser interferometry. Laser interferometry uses a continuous laser as a light source to determine the distance change by measuring the movement of fringes, so it has sub-wavelength resolution. Through the frin...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S17/08
CPCG01S17/08
Inventor 武腾飞韩继博梁志国邢帅张磊
Owner BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA
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