High Precision Temperature Control of Optical Frequency Discriminator and Its Influence on Measurement

Cunfeng Zhao; Decang Bi; Liyuan Jiang; Xiaopeng Zhu; Juan Du; Wendong Li; Weibiao Chen

doi:10.3788/CJL201845.0704008

Chinese Journal of Lasers, Volume. 45, Issue 7, 0704008(2018)

High Precision Temperature Control of Optical Frequency Discriminator and Its Influence on Measurement

Cunfeng Zhao^1,2, Decang Bi^{、* *}, Liyuan Jiang¹, Xiaopeng Zhu¹, Juan Du^1,2, Wendong Li^1,2, and Weibiao Chen¹

¹ Key Laboratory of Space Laser Communication and Detection Technology, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China

² University of Chinese Academy of Sciences, Beijing 100049, China

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Figures & Tables(14)

Fig. 1. Temperature measurement principle diagram based on AD7793

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Fig. 2. Flow chart of temperature control

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Fig. 3. Temperature control structure layout of frequency discriminator

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Fig. 4. Temperature control measurement curves of frequency discriminator

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Fig. 5. Temperature control curves of frequency discriminator at different set points. (a) 30 ℃; (b) 35 ℃; (c) 40 ℃; (d) 45 ℃

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Fig. 6. Allan variance curves of temperature data in Fig.5

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Fig. 7. Spectral measurement optical path of frequency discriminator

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Fig. 8. Effect of temperature control accuracy on dual channel lines. (a) Transmission spectra under the temperature of 35 ℃ and 34.994 ℃; (b) local detail of the intersection in Fig. (a)

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Fig. 9. Resistance-temperature fitting curve of RTD-Pt1000

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Fig. 10. Error of resistance temperature drift

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Fig. 11. Transmission error of frequency discriminator

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Table 1. Temperature control experimental statistics results of frequency discriminator℃
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Table 1. Temperature control experimental statistics results of frequency discriminator℃
Set value Measurevalue Systemerror STDerror Peak topeak error
30 29.9929 0.0071 0.0061 0.0239
35 34.9911 0.0089 0.0056 0.0239
40 39.9920 0.0080 0.0057 0.0240
45 44.9976 0.0024 0.0075 0.0273

Table 2. RTD-Pt1000 fitting error

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Table 2. RTD-Pt1000 fitting error

Temperature /℃	R calibration /Ω	R linear fit /Ω	Error /℃
10	1039.025	1039.0263	0.0004
15	1058.495	1058.4969	0.0007
20	1077.935	1077.9391	0.0005
25	1097.347	1097.3529	0.0004
30	1116.729	1116.7384	0.0001
35	1136.083	1136.0956	0.0005
40	1155.408	1155.4243	0.0011
45	1174.704	1174.7247	0.0019
50	1193.971	1193.9966	0.0028

Table 3. Temperature measurement random error statistics

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Table 3. Temperature measurement random error statistics

Source of error	Error /℃	Description
PT1000 nonlinear	0.0013	Linear fitting
RTD-Pt1000 self-heating effect	0	Drive current 210 μAafter calibration
Current source and wireresistance mismatch	0	After calibration
R_ref temperature drift	0.0018	Reference voltagebased on R_ref
Signal amplificationand acquisition noise	0.0001
ADC nonlinear	0.0028	Nonlinear error<1.5×10^-6
In all	0.0036

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Cunfeng Zhao, Decang Bi, Liyuan Jiang, Xiaopeng Zhu, Juan Du, Wendong Li, Weibiao Chen. High Precision Temperature Control of Optical Frequency Discriminator and Its Influence on Measurement[J]. Chinese Journal of Lasers, 2018, 45(7): 0704008

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