研究目的
To design a stroboscopic grating stripe projection device based on small-scale three-dimensional measurement, utilizing the high brightness of the laser and the stroboscopic effect to convert a line laser signal into a grating strip by the rotation of a multi-faceted rotating prism.
研究成果
The stroboscopic grating stripe projection device successfully converts the line laser signal into a grating strip by the rotation of the multi-faceted rotating prism, based on the stroboscopic effect. The device is applied to the three-dimensional reconstruction of the gypsum section, demonstrating its effectiveness in small-scale three-dimensional measurement.
研究不足
The line width of the stripe is often limited by system characteristics and optical focus of the cylindrical mirror. The laser opening time for the thinnest line width is a critical parameter that affects the intensity of the stripe.
1：Experimental Design and Method Selection:
The system uses a line-structured laser and a high-speed rotating multi-faced prism to project grating fringes based on the stroboscopic effect. The relationship between grating stripe, modulation signal, and prism rotation speed is analyzed.
2：Sample Selection and Data Sources:
The projection device is applied to the three-dimensional measurement of a gypsum section.
3：List of Experimental Equipment and Materials:
Includes a semiconductor laser, SOS-BB10 multi-faceted rotating prism, STM32F103C8T6 microcontroller, 74HC125 buffer/line driver, AD8001 chip for photodetector circuit, and mechanical components designed using Proe software.
4：Experimental Procedures and Operational Workflow:
The laser is modulated by a dedicated control circuit to generate a laser signal of a certain frequency. The line laser signal is projected by the specular reflection of the rotating prism to realize the grating stripe. The system controls the prism rotation speed and the synchronous modulation signal in real time based on the feedback signal of the photodetector.
5：Data Analysis Methods:
The spatial frequency of the fringes is determined by the prism rotation and the modulation signal period, with the density of the stripe limited by the thinnest line width of the stripe.
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