On-Orbit Total Dose Measurements From 1998 to 2007 Using pFET Dosimeters

The orbit of BeiDou satellite system is a very ideal space environment monitoring area. The radiation dosimeters are present on this series of navigation satellites, and they are respectively installed in the x, y and z positions. A charge detector installed in the satellite cabin is used for monitoring satellite deep charging potential. Radiation dosimeters select the 100 nm P-channel metal oxide semiconductor (PMOS) sensors, whose monitoring range can reach 2 × 106 rad (Si). In the circuit design part, the “zero temperature coefficient” current of the PMOS is used as the constant current source for measuring, which effectively reduces the influence of temperature effect. Three radiation dosimeters realize the daily dose change monitoring during the satellite’s operation, and the detection accuracy is high. The deep charging potential sensor adopts the equivalent capacitor design which is composed of the outer optical quartz glass and the inner circular gold-plate. The two kinds of detection instruments have the characteristics of small volume, low power consumption and high detection accuracy. The detection results show that they have important application value for space environment prediction and guarantee.

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Surface charging and dose monitor on geosynchronous orbit satellite

Zheng

Zhang

Xiang

et al. 2023

Open Astronomy

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Based on the typical dielectric materials and devices of satellite, a surface charging and dose monitor (SCAD) was developed to measure the surface charging voltage, current, and dose under different shielding depths. The SCAD has been successfully launched into orbit on June 23, 2020. The measurement results on orbit show that the SCAD works normally, and the data of SCAD are reasonable. The results show that the radiation dose rate on geosynchronous orbit is about 0.4 mrad(Si)/s, and the maximum charging voltage is about −800 V during the initial measuring period. The charging voltage is consistent with the trends of geomagnetic disturbance Kp index. The on-orbit data provide basic data on surface charging and discharging effect and total dose effect, supporting the safe and reliable operation of the satellite.

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On-Orbit Total Dose Measurements From 1998 to 2007 Using pFET Dosimeters

Cited by 3 publications

References 12 publications

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Radiation-Tolerant Superfluorescent Fiber Sources for High-Performance Fiber-Optic Gyroscopes Working Under Gamma Irradiation Higher Than 200 krad

Radiation dosimeter and charge detector onboard BeiDou navigation satellites in MEO

Surface charging and dose monitor on geosynchronous orbit satellite

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