Method and device for assisting focusing
A technology for assisting focusing and focusing, applied in the field of spectral detection, can solve the problems of focusing failure and affecting focusing speed, and achieve the effect of fast focusing and improving focusing speed.
Inactive Publication Date: 2020-07-28
SHANDONG UNIV
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Problems solved by technology
Phase detection focusing is applied through the phase detection module, and the position of the focal plane can be obtained immediately after one detection. However, the focusing process is affected by the intensity of ambient light. In low-light environments, it is easy to cause focusing failure and affect the focusing speed.
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[0029] Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the present invention. Rather, they are merely examples of apparatuses and methods consistent with aspects of the invention as recited in the appended claims.
[0030] An embodiment of the present application provides an auxiliary focusing method, which is used in a spectrum detection device, and assists the spectrum detection device to realize fast focusing. See attached figure 1 , including the following steps:
[0031] S101: Set and fix the first laser, make the light beam of the first laser pass through the focal point of the camera, and determine...
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The auxiliary focusing method and device disclosed in the present application are used in spectral detection equipment, and the method includes the following steps: setting and fixing a first laser, allowing the light beam of the first laser to pass through the focus of the camera, and determining the light beam of the first laser The included angle with the main axis of the camera is α; the laser spot image of the light beam emitted by the first laser on the object to be photographed is collected by the camera; the first laser spot on the laser spot image is identified; The distance L between the first laser point and the main axis of the camera on the point image, and calculate the focus offset H, H=ALcotα, A is the camera parameter; determine the first laser and the first laser point and the The positional relationship of the main axes of the camera, and the focus offset position of the photographed object is determined according to the positional relationship. The auxiliary focusing method and device disclosed in the present application assist in realizing fast focusing of the spectral detection device, and improve the focusing speed of the spectral detection device.
Description
technical field [0001] The invention relates to the technical field of spectrum detection, in particular to an auxiliary focusing method and device. Background technique [0002] Laser-induced breakdown spectroscopy technology, through high-energy pulsed laser focusing on the surface of the sample to form plasma, continuous bremsstrahlung radiation and ion emission lines of internal elements are generated during the decay of plasma energy, the spectral emission signal is collected by a spectrometer, and the spectrogram is analyzed The characteristic peak intensity corresponding to the element can be used for qualitative and quantitative analysis of the sample. [0003] In the detection of laser-induced breakdown spectroscopy, it is necessary to focus the laser on the sample to be tested to excite the spectral signal, and the distance between the laser focus point and the sample will affect the intensity of the spectral signal. For natural samples with rough surfaces, when t...
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IPC IPC(8): G01N21/63G01N21/01H04N5/232
CPCG01N21/01G01N21/63H04N23/67
Inventor 毕云峰吕铁良燕艳董晓舟周强
Owner SHANDONG UNIV