发明名称 |
Temperature transmitter with on-line calibration using johnson noise |
摘要 |
A temperature transmitter and a process control system includes a sensor input for coupling to a temperature sensor having a temperature dependent resistance. The resistance measuring circuitry couples to the sensor input and provides a resistance output related to resistance of the temperature dependent resistance. Analog to digital conversion circuitry couples to the sensor input and provides a digital output related to AC signals across the sensor input. Digital signal processing circuitry isolates a Johnson noise component of the AC signals and provides a digitized Johnson noise output. Temperature measurement circuitry provides a calibrated temperature output based upon the resistance output and the digitized Johnson noise output. Output circuitry transmits the calibrated temperature output over the process control loop.
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申请公布号 |
US5746511(A) |
申请公布日期 |
1998.05.05 |
申请号 |
US19960582514 |
申请日期 |
1996.01.03 |
申请人 |
ROSEMOUNT INC. |
发明人 |
ERYUREK, EVREN;LENZ, GARY |
分类号 |
G01K7/30;G01K15/00;(IPC1-7):G01K15/00 |
主分类号 |
G01K7/30 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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