Procedure for the calibration of surface temperature sensors used in dimensional metrology

Yebra, Francisco; González-Jorge, H.; Lorenzo, Louise; Campos, Mariana; Silva, J; Troncoso, F; Rodríguez, José Javier Polo

doi:10.1088/0026-1394/44/3/008

Cited by 3 publications

(4 citation statements)

References 3 publications

(4 reference statements)

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“…Calibration after packaging requires that every individual packaged sensor is brought to the same temperature as a reference thermometer. This typically means that the two are brought in good thermal contact by means of a thermally conducting medium, such as a liquid bath or a metal block [13], [14]. Some stabilization time will be needed, since the sensor will not be at the desired temperature when it enters the calibration setup.…”

Section: Conventional Calibration Techniquesmentioning

confidence: 99%

“…Before applying the new calibration techniques, we calibrated 24 samples of our prototype using a conventional calibration procedure. A setup similar to the one described in [14] was used. The samples were mounted four at a time within a small cavity inside a large aluminum isothermal block.…”

Section: B Calibration Against a Pt-100 Thermometermentioning

confidence: 99%

“…The compatibility between the two calibration techniques can be quantified by checking whether the differences in correction fall within the interval defined by the expanded uncertainty associated with the calibration techniques [14]. Taking the uncertainty of ±0.011 • C due to the voltage measurement as an (optimistic) estimate of the standard uncertainty associated with the ∆V BE -based calibration, and combining this with the standard uncertainty of ±0.02 • C of the Pt-100-based calibration, gives a combined standard uncertainty of ±0.023 • C. Using a coverage factor of 2, 95% of the differences in correction should fall within the interval ±0.046 • C if the calibrations are compatible.…”

Section: Calibration Based On ∆V Be Measurementmentioning

confidence: 99%

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Low-Cost Calibration Techniques for Smart Temperature Sensors

et al. 2010

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Smart temperature sensors generally need to be trimmed to obtain measurement errors below ±2 • C. The associated temperature calibration procedure is time consuming and therefore costly. This paper presents two, much faster, voltage calibration techniques. Both make use of the fact that a voltage proportional to absolute temperature (PTAT) can be accurately generated on chip. By measuring this voltage, the sensor's actual temperature can be determined, whereupon the sensor can be trimmed to correct for its dominant source of error: spread in the on-chip voltage reference. The first calibration technique consists of measuring the (small) PTAT voltage directly, while the second, more robust alternative does so indirectly, by using an external reference voltage and the on-chip ADC. Experimental results from a prototype fabricated in 0.7µm CMOS technology show that after calibration and trimming, these two techniques result in measurement errors (±3σ) of ±0.15 • C and ±0.25 • C, respectively, in a range from −55 • C to 125 • C.

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Section: Conventional Calibration Techniquesmentioning

confidence: 99%

Section: B Calibration Against a Pt-100 Thermometermentioning

confidence: 99%

Section: Calibration Based On ∆V Be Measurementmentioning

confidence: 99%

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Low-Cost Calibration Techniques for Smart Temperature Sensors

et al. 2010

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“…In order to maintain the reliability of measurements of surface temperature, contact surface thermometers are calibrated on the basis of the International Temperature Scale of 1990 (ITS-90) [1]. With this in mind, national metrology institutes have proposed and developed various methods for calibrating surface thermometers [2][3][4][5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Estimation of environmental effects on performance of contact surface thermometers using a calibration apparatus

Saito¹,

Nakano²,

Ogura³

et al. 2020

Meas. Sci. Technol.

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In previous work, we developed a calibration apparatus for use with contact surface thermometers. In this apparatus, the temperature of the upper surface of a copper cube was used as reference surface temperature. In this new study, uncertainty components due to environmental conditions in the measurement space were estimated by measuring the temperature of the upper surface of the calibration apparatus and the output of contact surface thermometers while varying ambient temperature and air flow speed. It was found that the temperature of the upper surface of the calibration apparatus and the output of the contact surface thermometer increased with increasing ambient temperature. The uncertainty in our previous work due to the effect of the ambient temperature was estimated to be 0.01 • C, based on the ±1 • C variance of the ambient temperature in the lab room. We also found that the measured values tended to decrease with increasing the air flow speed around the calibration apparatus, but the effect of the air flow speed depends on the size of the contact surface thermometer. The effect of the air flow speed around the calibration apparatus was 0.07 • C using Model A of the contact surface thermometer, which has a 10 cm height, on the basis of the stability of air flow in the lab room being within ≪2 m s −1 .

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