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Dynamic measurement method and instrument of laser spots

A technology of laser spot and dynamic measurement, which is applied to instruments and electric radiation detectors for photometry, etc. It can solve the problems of difficult to quickly analyze the detailed information of the beam, slow measurement speed, and difficult to realize dynamic measurement of the beam.

Active Publication Date: 2012-07-11
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Application Information

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Problems solved by technology

However, the measurement speed of the mechanical measuring instrument is slow, it is difficult to quickly analyze the detailed information of the beam, and it is difficult to realize the dynamic measurement of the beam

Method used

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  • Dynamic measurement method and instrument of laser spots
  • Dynamic measurement method and instrument of laser spots
  • Dynamic measurement method and instrument of laser spots

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Embodiment Construction

[0037] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0038] According to an embodiment of the present invention, a dynamic measuring method and measuring instrument for a laser spot are provided. Hereinafter, the laser spot dynamic measuring instrument is referred to as LBPA for short. Such as figure 1 As shown, LBPA mainly includes attenuator, CCD, servo circuit and data processing device. In this embodiment, the data processing device is a PC, on which an application program is installed, and the core of the application program is an algorithm to be described below.

[0039] The LBPA of this embodiment uses a video camera to collect images, uses a computer to store the images, analyzes the two-dimensional intensity distribution of the beam, and gives the information of the beam.

[0040] A CCD camera is composed of a series of two-dimensional mosaic-like detectors (called pixels). The two-dimensiona...

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Abstract

The invention provides a dynamic measurement method and instrument of laser spots. The dynamic measurement method comprises the following steps of: (1) respectively detecting received light intensities by all pixels of a CCD (Charge Coupled Device); (2) marking light intensity data detected by all the pixels as a matrix I, and obtaining Sigma x, Sigma y, xc, yc, A and I0 by utilizing a linear least square method on the basis of a laser spot light intensity distribution formula according to the actually-measured light intensity data matrix I and corresponding coordinate values of horizontal and vertical axis of all the corresponding pixels, wherein xc and yc respectively refer to coordinate values of the horizontal and vertical axis of a light spot center, Sigma x and the Sigma y respectively refers to 1 / e radiuses of the horizontal and vertical axis, A refers to amplitude and I0 refers to dark noise; (4) obtaining a modified vector D of a reference vector P(k) by using a Newton iteration method, and calculating P(k+1)=P(k)+D; and (5) repeatedly executing the step (4) till the iteration frequency reaches a preset value K or the error of the reference vector P(k) which is obtained by iteration for kth times is smaller than a preset tolerance value, and taking all elements of the reference vector P(k) at the time as a measured laser beam parameter. The invention further provides a corresponding dynamic measurement instrument of laser spots. The dynamic measurement method and instrument of the laser spots have the advantages of high measuring speed, high precision and large dynamic range.

Description

technical field [0001] The invention relates to the technical field of laser beam diagnosis, in particular, the invention relates to a dynamic measurement method and measuring instrument for laser spot. Background technique [0002] The laser spot dynamic measuring instrument is a measurement system for diagnosing the laser beam of continuous or pulsed lasers. It can be used in various application fields such as laser beam optimization, laser parameter control, Gaussian fitting analysis, and beam alignment. There are two main types of laser spot dynamic measuring instruments in the prior art, one is to use a camera as a beam parameter measurement system, that is, a camera method measuring instrument; the other is to use a movable mechanical slit or scan with a blade method The incident beam thus obtains the beam information, that is, the mechanical method measuring instrument. The advantage of the mechanical method is that the dynamic range is large, and the beam parameters...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J11/00G01J1/42
Inventor 曹强王如泉
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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