In the development of solar absolute spectral irradiance observation equipment, high accuracy solar tracking system is one of the key links, and its tracking accuracy directly affects the irradiance measurement uncertainty. In order to determine the tracking accuracy of the four quadrant detectors, the principle and location algorithm of the four-quadrant detector is analyzed, and the method of calculating the precision of the tracking accuracy depending on astrogram is discussed by using the two-dimensional rotating table. The outdoor sun tracking experiment is carried out and the causes of the tracking error are analyzed. This can be seen in the experimental results. Four quadrant detector tracking error is as follows: the sun azimuth error is less than 0.375° and the azimuth error is less than 1.099°. The positioning accuracy is not only related to the environmental factors, but also the poor coincidence between the center of the cavity imaging hole of the detector and the center of the four-quadrant detector is the main reason for the large deviation of the mobile tracking curve.
Aiming at the stability control requirements of high stability solar simulation light source, a white laser power stability control method based on quartz is proposed. The quartz plate is connected and fixed with the scanlab, and the relationship between the Angle of the incident light and the transmittance is taken as the signal regulation principle. When the scanlab rotates the quartz slab, the light signal transmitted by the quartz slab is adjusted. Based on Fresnel's Law, the rotation Angle and transmittance parameters under different wavelength of incident light are analyzed. And the rotation Angle range of quartz is calculated, which provides the output parameter support for realizing the power stability of light source. PID algorithm is used to modulate the error of the signal of the monitoring detector and the voltage corresponding to reference power so as to accurately adjust the output of scanlab. The stabilizer is used to control the power of the white laser, and the Trap detector is used to verify the level of power stability. The experiment results of the stability of the laser after modulation is as follows: the standard deviation CV is 0.069%/55min and the peak-to-peak fluctuation SV is ±0.302%/55min. Compared with the free-running result, SV and CV are improved to 1/15.83 and 1/33.04 respectively, and the power stability of the white laser is enhanced, meeting the stability requirement of 99.6%.
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