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Femtosecond laser distance measuring device and method

A femtosecond laser and distance measuring device technology, which is applied in the direction of measuring devices, optical devices, instruments, etc., can solve the problems of dead zone, limit the range of distance measurement, and measurement cannot continue, so as to solve the problem of dead zone and expand the range of distance measurement Effect

Active Publication Date: 2017-01-04
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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Problems solved by technology

[0003] In the development process of the advanced femtosecond laser ranging principle, one of the principle defects is that the aliasing phenomenon that occurs when the measurement optical interference signal and the reference optical interference signal are close makes the measurement impossible, thus limiting the ranging range of the entire instrument. The region where this phenomenon occurs is called the dead zone

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  • Femtosecond laser distance measuring device and method
  • Femtosecond laser distance measuring device and method
  • Femtosecond laser distance measuring device and method

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Embodiment Construction

[0026] Embodiments of the present invention will be described in detail below. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.

[0027] refer to figure 1 , in one embodiment, a femtosecond laser distance measuring device, comprising a first reference optical path, a second reference optical path and a measurement optical path, the first reference optical path and the second reference optical path have a fixed optical path difference , the first reference optical path and the second reference optical path are respectively provided with shutters, and the shutters are used to switch the reference optical path during the ranging process so as to use the corresponding reference light for measurement.

[0028] Such as figure 1 As shown, in a preferred embodiment, the first reference optical path, the second reference optical path and the measurement light B path are realized through ...

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Abstract

A femtosecond laser distance measuring device comprises a first reference light path, a second reference light path and a measuring light path. The first reference light path and the second reference light path have the fixed optical path difference and are each provided with a shutter. The shutters are used for switching the reference light paths in the distance measuring process so as to use the corresponding reference light for measurement. A femtosecond laser distance measuring method comprises the steps that dead zone ranges are set for interference signals of first reference light and second reference light; in the data collection process, when the interference signals of measuring light enter the dead zone range of the reference light in use, the shutter corresponding to the reference light path is controlled to be closed, and the shutter corresponding to the other reference light path is opened; when the measured object distance is calculated, the fixed optical path difference is used for compensating the measuring distance difference caused by switching of the two reference light paths. The dead zone problem existing in femtosecond laser distance measuring can be effectively solved.

Description

technical field [0001] The invention relates to the technical field of laser ranging, in particular to a femtosecond laser ranging device and method. Background technique [0002] At present, for laser ranging instruments, the performance of measurement accuracy, range and ranging speed has been greatly improved, but in the field of industrial production, national defense and scientific research in the development of modern science and technology, precision ranging technology is in the realization of absolute distance measurement. At the same time, higher requirements are put forward for the three aspects of measurement speed, range and accuracy. The existing laser range finder has been unable to meet the increasing technical development requirements. The new type of femtosecond laser that appeared at the end of the 20th century brought a revolutionary turning point in laser ranging technology, and quickly became a hot spot in international ranging research. [0003] In th...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/02
CPCG01B11/02
Inventor 倪凯周倩王兰兰王晓浩吴冠豪胡凯
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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