A KEY TECHNOLOGY FOR MONITORING STRESS BY TEMPERATURE: MULTICHANNEL TEMPERATURE MEASUREMENT SYSTEM WITH HIGH PRECISION AND LOW POWER CONSUMPTION |
| |
| Authors: | ZHANG Zhi-he CHEN Shun-yun LIU Pei-xun |
| |
| Institution: | 1.School of Biomedical Engineering, Capital Medical University, Beijing 100069, China;2.State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China |
| |
| Abstract: | Experimental and theoretical researches have confirmed that changes in crustal stress can be monitored by the in situ bedrock temperature. Monitoring stress by temperature requires the high-precision and multi-channel temperature measurement system. We have developed such a system, based on the several refinements. The key parameters on temperature measurement system mainly include:1)the accuracy is better than 1.0mK. At the 99.5%confidence level, the accuracy reaches 0.5mK. This system can be used to detect the change of magnitude of a few tenths to several MPa. The sampling period can be set, depending on remote control. The sampling period is usually set 5 or 15 minutes. 2)A system has up to 20 channels, and commonly uses for 8 or 12 channels. 3)This system has a significant performance in low power consumption. The power is supplied by lead-acid battery with 12 volt. It is at least 2 years that a lead-acid battery, with contents of 120Ah12V, can supply the power for a system with 8 channels. In conclusion, multichannel temperature measurement system with high precision and low power consumption is designed and realized. Specially, the performance in low power consumption is of great significance, which can greatly reduce the maintenance cost after the measurement station is constructed. This temperature measurement system provides a basic technology for monitoring changes in crustal stress with bedrock temperature. |
| |
| Keywords: | stress measurement temperature measurement system multichannel high precision low power consumption |
|
|
