Technical requirements and uncertainty of far field laser spot centroid measurement using array detection method

Pang, Min; Gao, Xueyan; Rong, Jian

doi:10.1016/j.ijleo.2015.08.143

Cited by 4 publications

(3 citation statements)

References 5 publications

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“…It can be considered in the measurement uncertainty of the spot centroid and diameter. Its weight is equal to the response error of CCD, referred to by [ 31 ], and given by calibration. According to the corresponding relationship between the error and the incident angle, the applicable incident angle range of the system can be derived by the measurement requirements.…”

Section: Resultsmentioning

confidence: 99%

“…In addition, the system has good performance in the range of measurable laser beam width and light intensity; for the former, the maximum is 66.7% of the array aperture (Gaussian beam), which is generally 76 mm. In this case, the power received by the array reaches 99% of the total power of the laser beam [ 31 ]. As for the minimum, the spot needs to cover at least ten fibers in the radial direction so as not to affect the subsequent interpolation calculation and spot recovery [ 32 ]; therefore, the minimum laser beam width needs to reach 33.4% of the array aperture, that is, 38 mm.…”

Section: Resultsmentioning

confidence: 99%

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Study on Laser Parameter Measurement System Based on Cone-Arranged Fibers and CCD Camera

Luo

Qin

Hou

et al. 2022

Sensors

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This paper proposes a new laser parameter measuring method based on cone-arranged fibers to further improve the measurable spot size, allowable incident angle range, and spatial sampling resolution. This method takes a conical array composed of flexible fibers to sample and shrink the cross-section spot of the laser beam, facilitating low-distortion shooting with a charge-coupled diode (CCD) camera, and adopts homogenized processing and algorithm analysis to correct the spot. This method is experimentally proven to achieve high-accuracy measurements with a decimeter-level spot-receiving surface, millimeter-level resolution, and high tolerance in order to incite skew angle. Comparing the measured spot under normal incidence with the real one, the root mean square error (RMSE) of their power in the bucket (PIB) curves is less than 1%. When the incident angle change is between −8° and 8°, the RMSE is less than 2% and the measurement error of total power is less than 5% based on the premise that the fiber’s numerical aperture (NA) is 0.22. The possibility of further optimizing the measurement method by changing the fiber parameters and array design is also reported.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Study on Laser Parameter Measurement System Based on Cone-Arranged Fibers and CCD Camera

Luo

Qin

Hou

et al. 2022

Sensors

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show abstract

“…Due to the limitations of the CCD camera itself, while the use of detector arrays to collect the [10][11][12][13] spot data by the background light has less influence, and does not require very complex algorithms in the preprocessing of the data. the advantages of the detector array measurement method of far-field spot test are: according to the need to measure the occasion to flexibly design the applicable size of the target plate, able to measure the larger size of the spot; using the detector to directly receive the signal, high signal-to-noise ratio, good response, and able to measure the timing information; not only through the detector data collected directly on the spot parameters to be analyzed, but also can be reduced to the array signal Obtain the spot image.…”

Section: Introductionmentioning

confidence: 99%

The designing of a far-field laser facula measurement system based on detector array

Fu,

wang,

et al. 2024

Optical Sensing and Detection VIII

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Measurement of the far-field parameters of lasers after atmospheric transmission plays an important role in accurately evaluating the atmospheric transmission characteristics of lasers and the overall performance of laser systems. The spot size formed by the laser after long-distance transmission can reach the meter scale, which cannot be measured by the traditional camera due to the limitation of field of view and resolution. In this paper, a measurement far-field laser system for large-size far-field lasers is designed by the detector array method. The following parts are mainly studied, first, the design of the acquisition circuit of the detector array, second, the development of FPGA for data acquisition and network data transmission, and third, the development of the host computer software to complete the remote control, receiving data, image restoration and parameter measurement work.The acquisition circuit is based on InGaAs photodetectors, operational amplifiers and analog-to-digital converters to design hardware circuits; Xilinx's Artix-7 series xc7a50t chip as the core to complete the multi-channel parallel acquisition and network data transmission based on the W5300 network chip; the upper computer software is based on the MFC platform for the development of the software, and the proposed image restoration algorithm based on the predicted gradient. The upper computer software is developed based on MFC platform, and the image recovery algorithm based on predicted gradient is proposed. Experimental tests show that the hardware circuit works stably, the communication reliability is high, and the data acquisition and transmission frequency reach 100Hz according to the design requirements.

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Analytic error model of beam profile evaluation for detector array method

Xie¹,

Yang²,

Zhao³

et al. 2019

Fifth International Symposium on Laser Interaction With Matter

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Technical requirements and uncertainty of far field laser spot centroid measurement using array detection method

Cited by 4 publications

References 5 publications

Study on Laser Parameter Measurement System Based on Cone-Arranged Fibers and CCD Camera

Study on Laser Parameter Measurement System Based on Cone-Arranged Fibers and CCD Camera

The designing of a far-field laser facula measurement system based on detector array

Analytic error model of beam profile evaluation for detector array method

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