Improvement Of Temperature Sensor And Application In Space Polarization State Generator

In space optics experiments,temperature detection is an important issue.A space optical fiber temperature sensor based on Fabry-Perot(F-P)cavity interference was developed by using crystalline quartz as the raw material cavity This kind of material will change the refractive index and the cavity length with the temperature change so that the temperature can be measured.In this paper,the sensor system is improved.Previously,the reflected light of the F-P cavity was used for temperature detection,and the optical circulator was used to receive the reflected light to analyze the temperature change.However,the optical circulator increases the coupling difficulty and increases the error.In this paper,the transmitted light of the F-P cavity is used for temperature detection,and the multimode fiber is used for reception in the transmission direction.The thesis carries out theoretical analysis of the experiment,assembles the experimental device,measures the results,and finally sums up the empirical formula for the result analysis.From the result analysis,the mean square deviation between the temperature measured and the temperature obtained using the empirical formula is s = 0.0564 ?.Meet the needs of space optics experiments.After that,the design of the spatial light circular polarization state generator was carried out,and the temperature sensor was applied on it.The main content of this paper:(1)Detect the temperature range of a series of quartz chips and heat them on theexperimental table,so as to measure the relationship between a series oftemperatures and the transmitted light power,and select the appropriate quartz chips.(2)After the crystalline quartz material is affected by the ambient temperature,therefractive index and thermal expansion of the material are analyzed,and theobtained formula is fitted using MATLAB software to obtain the relationship curvebetween temperature and transmitted light power For maximum and minimumtransmittance,design a quartz card slot to bond the quartz plate and the beamsplitter prism.Build and test the optical fiber temperature sensor on thexperimental heating platform.After the test,the experimental results are obtained,and the results are analyzed to find that the error between the measured data and theactual data is within 0.1 ?.(3)An optical fiber temperature sensor test system was built,and the test wascompleted.The results were analyzed and the error between the measured data andthe actual data was within 0.1 ?.(4)Design and build a space light polarization state generator.Since a quarter-waveplate is used,the temperature measurement using the built-in sensor obtains therelationship between the optical power and the polarization state of the light emittedby the generator,and the theory The comparison of the analysis values shows that itis in accordance with the theoretical derivation,and the subsequent polarizationcompensation experiment can be carried out.