In order to reduce the thermal distortion of the deformable mirror(DM) and improve the laser beam quality, a new type of a 19-element water cooling deformable mirror was developed, and the finite element model of DM with water cooling part was built. The deformation, temperature rising and high-order aberrations were calculated after applying the laser irradiation to the mirror. Based on the results, we found the distortions and temperature rising of DM with water cooling part are much lower than those without it. The thermal distortion and temperature rising decreased from 0.316 μm to 0.210 μm and from 30.3°C to 27.1°C respectively, and the corresponding removed low-order Zernike coefficient residual error was reduced from 0.068 μm to 0.043 μm. The high-order aberrations between them were different. The results have practical engineering application for the design of DM in future higher power laser systems
The measurement of plant growth's luminous environment is the basis of urban agriculture, such as LED plant factory. The PAR quantum sensors, which measure the photon flux of radiation in the spectral interval 400nm-700nm, can't measure the several intervals which are used in plant lighting simultaneously, but the LED plant factory needs these data and their ratios by far, a type of multi-channel quantum sensor is designed to solve this problem. Firstly, the paper expounds the design principle, circuit and structure of the sensor, and calibrate the unregulated sensors by the PQS-1 sensor under the calibration device constructed by controller based on DMX512 protocol. The test results show that the sensor has good linear response, whose average R2 is 0.9956. The article finally designs a set of light environment control system, which can auto control the photon fluxes and light quality ratios, based on the sensors.
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