Experimental Investigation of a Johnson Noise Thermometry Using GMR Sensor for Electric Vehicle Applications

Xuyang Liu, Chao Zheng, Chunhua Liu, Philip W.T. Pong

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


A new temperature measurement method using a giant magnetoresistance (GMR) sensor based on Johnson noise thermometry (JNT) is proposed in this paper. This paper presents the principle of this GMR-based JNT and demonstrates its feasibility by measuring power spectral density of noise voltage in the bandwidth from 10 kHz to 22.8 kHz and resistance of GMR sensor and analyzing their relationship with the absolute temperature. The measuring errors throughout the measurement of temperature from -40 °C and 150 °C in the thermal chamber were less than ±1.8 °C with integration time of 58.6 s. Its dynamic sensing performance under both varying temperature and changing external magnetic field was characterized and demonstrated. A practical demonstration of the GMR-based JNT for measurement of surface temperature of a battery pack on an electric-vehicle testbed was also provided. Therefore, it is feasible to implement this new thermometry with a GMR sensor, making spintronic sensor multifunctional in EV applications by being a temperature sensor as well.

Original languageEnglish (US)
Pages (from-to)3098-3107
Number of pages10
JournalIEEE Sensors Journal
Issue number8
StatePublished - Apr 15 2018
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Instrumentation
  • Electrical and Electronic Engineering


  • GMR sensor
  • Johnson noise thermometry (JNT)
  • electric vehicle
  • multifunctional spintronic sensor


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