A universal and low-cost temperature thermometer is realized via a special circuit, integrated circuit
chip with microprocessor and analog to digital converter, and digital bus interface. Various thermocouples and
resistance temperature detectors used for temperature sensing may be connected to same thermometer. A special
signal condition circuitry is designed and a matching algorithm is proposed. A novel calibration method named
disassembled calibration is proposed in order to enhance efficiency and flexibility for the whole system. Additionally,
it presents a combination method of low order polynomial fitting and piecewise linearity for the nonlinearity
calibration of the thermocouple and the resistance temperature detector. A cold junction compensation based
on digital way is described. And the matching algorithm and calibration method may eliminate errors stemming
from excitation voltage source and reference voltage source, and can weaken quantization error of analog to digital
converter and drift of components, too. Furthermore, the 400 times oversampling is completed by sequential and
equal interval sampling to upgrade accuracy of analog to digital converter from original 12 to 15 bits and to raise
signal-to-noise ratio. Finally, during a long time monitoring, experiment results show that errors at each static
point are less than ±0.2?C for the thermocouple system and less than ±0.1?C for the resistance temperaturedetector system.
ZHU Min-ling (朱敏玲)
. A Thermometer Based on Diverse Types Thermocouples and Resistance Temperature Detectors[J]. Journal of Shanghai Jiaotong University(Science), 2015
, 20(1)
: 93
-100
.
DOI: 10.1007/s12204-015-1594-y
[1] Pham Q T. Encyclopedia of meat sciences [M]. Sydney,Australia: Elsevier, 2014.
[2] Childs P R N, Greenwood J R, Long C A. Review of temperature measurement [J]. Review of Scientific Instruments, 2000, 71(8): 2959-2978.
[3] Guo C Z, Chun L Z, Li P S, et al. Research on and applications of Au/Pt thermocouples [J]. Applied Mechanics and Materials, 2014, 483(1): 105-109.
[4] Sung W T, Chen J H, Hsiao C L. Data fusion for PT100 temperature sensing system heating control model [J]. Measurement, 2014, 52(6): 94-101.
[5] Hunter G W, Stetter J R, Hesketh P J, et al.Smart sensor systems [J]. The Electrochemical Society,2010, 1(4): 29-34.
[6] Meijer G C M. Smart sensor systems [M]. West Sussex,United Kingdom: John Wiley & Sons, 2008.
[7] Li R B, Cui C. Comparison and research of thermocouple measuring temperature curve and theoretical temperature curve in grinding [J]. Applied Mechanics and Materials, 2014, 454: 280-287.
[8] Kumar R, Sahoo N. Dynamic calibration of a coaxial thermocouples for short duration transient measurements [J]. Journal of Heat Transfer, 2013, 135(12):1-7.
[9] Danismana K, Dalkiran I, Celebib F V. Design of a high precision temperature measurement system based on artificial neural network for different thermocouple types [J]. Measurement, 2006, 39(8): 695-700.
[10] Pantazis S, Buthig J, Jousten K. Conjugate heat transfer simulations of a thermocouple sensor in a low temperature nitrogen gas ambient [J]. International Journal of Heat and Mass Transfer, 2014, 70(3): 536-544.
[11] Simcik M, Ruzicka M C, Mota A, et al. Smart RTD for multiphase flow systems [J]. Chemical Engineering Research and Design, 2012, 90(11): 1739-1749.
[12] Zhu M L, Wang X, Wang L. A smart temperature sensor for storage battery V/T control in satellite power supply system [C]// 28th AIAA International Communications Satellite Systems Conference.Anaheim, California: AIAA, 2010.
[13] Instruments T. Electronic component’s datasheet [EB/OL]. (2007-03-10) (2013-02-10) http://pdf1.alldatasheet.com/datasheet-pdf/view/70563/LINER/LTC1047.html.
[14] Instruments T. STM32F103 [EB/OL]. (2009-06-07) (2013-01-10) http://www.gdicw.com/UploadFile/icpic/mmser/STMicroelectronics/13587.pdf.
[15] Sathyapriya J, Subashini C, Rubini P, et al. Data acquisition system of 8-channel temperature scanner using power line carrier communication [J]. International Journal of Advanced Research in Computer and Communication Engineering, 2014, 3(2): 5397-5400.
[16] Judd B. Key developing data acquisition specification:A tutorial [J]. EE-Evaluation Engineering, 2007,46(7): 20-29.
[17] Sarma U, Boruah P K. Design and development of a high precision thermocouple based smart industrial thermometer with on line linearization and data logging feature [J]. Measurement, 2010, 43(10): 1589-1594.
