SBOA596 May   2024 ADS124S08 , INA326 , MSPM0G3507 , OPA387 , PGA900 , REF200

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Temperature Measure
  5. 2Key Challenge to Design a Temperature Monitor
  6. 3Proposed Designs for Temperature Monitor Based NTC or RTD
    1. 3.1 Voltage Excitation
    2. 3.2 Current Excitation
    3. 3.3 Ratio Measure
    4. 3.4 Integrated Designs
  7. 4Summary
  8. 5References

Abstract

Temperature measuring and monitoring is widely used in medical equipment and industries. In MRI equipment, there needs to be several NTC to monitor liquid-helium temperature. In a ventilator, engineers need to monitor temperature of air and make sure the temperature of air is comfortable for the patient. In a CT system, the engineer needs to monitor temperature of DAS system for get best SNR and then high imaging quality. In an IVD system, engineers also need to monitor temperature of samples. In a hospital, the doctor also needs to monitor the temperature of the patient during surgical operations since this is a key parameter of humans. There are several methods based on different principles to measure temperature. However, most medical equipment prefers to use NTC or RTD for temperature measure since high precision, easy mounting, and inexpensive. This application note shows several designs to measure or monitor temperature with sensor of NTC or RTD. The methods proposed in this application note can also be used in other industry systems.