In this paper, a low-cost signal delay generator which can be used for lidar range gating is developed and implemented by MC100EP195 delay chip and STM32 microcomputer. LabVIEW is used to write the upper computer control software, and 4 delay chips cascade is adopted to realize 0-40ns delay range. By controlling the encoder and the upper computer, the delay accuracy of 10ps can be obtained. The inherent delay of the generator is 10ns, which can meet the requirements of lidar range gated detection and other high precision applications.
Method of homogenization of CO2 laser heating by means of metal gauze is researched theoretically and experimentally. Distribution of light-field of expanded beam passing through metal gauze was numerically calculated with diffractive optical theory and the conclusion is that method is effective, with comparing the results to the situation without metal gauze. Experimentally, using the 30W DC discharge laser as source and enlarging beam by concave lens, with and without metal gauze, beam intensity distributions in thermal paper were compared, meanwhile the experiments based on thermal imager were performed. The experimental result was compatible with theoretical calculation, and all these show that the homogeneity of CO2 laser heating could be enhanced by metal gauze.
This paper presents a kind of miniature handheld laser fluorescence spectrometer, which integrates a laser emission system, a spectroscopic system, and a detection system into a volume of 100×50×20 mm3. A universal serial bus interface is connected to PC for data processing and spectrum display. The emitted laser wavelength is 405 nm. A spectral range is 400 to 760 nm and 2-nm optical resolution has been achieved. This spectrometer has the advantages of compact structure, small volume, high sensitivity, and low cost.
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