Long-term relative stability of thermistors: Part 2

Lawton, Kevin M.; Patterson, Steven R.

doi:10.1016/s0141-6359(02)00110-1

Cited by 17 publications

(10 citation statements)

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“…Dissection of the thermistor chain in the laboratory revealed that water had caused damage to the thermistors, leading to sensor drift and thus to apparently increasing ground temperatures. Lawton and Patterson (2002) confirm that humidity adversely affects thermistor stability. The thermistor chain was replaced, as was the logger and special waterproofing measures were taken (e.g.…”

Section: Eggishornmentioning

confidence: 64%

“…One of the problems encountered over time with the use of thermistors is sensor drift, which induces apparent temperature changes. Average relative root mean square drift was found to be 0.19 ± 0.08 µK week −1 (9.88 × 10 −6 ± 4.16 × 10 −6 K year −1 ) in a study on the long-term stability of four commercially available glass bead thermistors (Lawton and Patterson, 2002). These authors found that positive thermistor drift is exacerbated by humidity -a ubiquitous problem in alpine environments.…”

Section: Introductionmentioning

confidence: 97%

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Challenges and solutions for long-term permafrost borehole temperature monitoring and data interpretation

Luethi¹,

Phillips²

2016

Geogr. Helv.

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Abstract. Long-term borehole temperature monitoring in mountain permafrost environments is challenging under the hostile conditions reigning in alpine environments. On the basis of data measured in the SLF borehole network we show three situations where ground temperature data should be interpreted with caution. (i) Thermistors have the tendency to drift, particularly if exposed to moisture or mechanical strain. This induces apparent warming or cooling, which can be difficult to differentiate from real ground temperature changes. Recalibration of thermistor chains is impossible if they cannot be extracted as a result of borehole deformation in creeping permafrost terrain. A solution using zero-curtain-based detection of drift and correction of data is presented. This method is however limited to the active layer, due to the lack of a reference temperature at greater depth. (ii) In contrast to drift-induced apparent warming, actual warming may be induced by natural processes or by the effects of construction activity. (iii) Control data from neighbouring boreholes are sometimes used to fill data gaps and discern drift -however these data may only underline the strong spatial variability of ground temperatures rather than provide measurement redundancy. A selection of recently observed problems regarding borehole monitoring in a hostile measurement environment are discussed, and advantages and possible drawbacks of various solutions including measurement redundancy or alternate instrumentation are presented.

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Section: Eggishornmentioning

confidence: 64%

Section: Introductionmentioning

confidence: 97%

Challenges and solutions for long-term permafrost borehole temperature monitoring and data interpretation

Luethi¹,

Phillips²

2016

Geogr. Helv.

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“…The corrections were all very smallwithin ±1.1 mC -indicating that the manufacturer had done a good calibration job at the factory. The self-heating effect of thermistors may potentially cause incorrect measurements when thermistors traverse regions of changing wind velocity (1-2 m/s) [12,13]. The excitation current of the Instrulab 3312A is about 80 A which generates a heat pulse of 3.5 J in each thermistor during the 0.3-s measurement.…”

Section: Thermistor Cross Calibration and The Self-heating Effectmentioning

confidence: 99%

Optimization and temperature mapping of an ultra-high thermal stability environmental enclosure

Zhao

Trumper

Heilmann

et al. 2010

Precision Engineering

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“…This, in turn, means that if the linewidth is, say, 5-10 GHz, then no frequency stabilization other than a modest control of the etalon temperature is needed. In this work, the etalon is suspended between two silicone o-rings and the temperature of the housing is controlled using a highlystable glass-bead thermistor as the temperature sensor [20,21].…”

Section: Setupmentioning

confidence: 99%

Broadband lasers for photo-ionization and repumping of trapped ions

Fordell

Lindvall

2019

J. Opt. Soc. Am. B

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A frequency-stable, broadband laser is presented for experiments on trapped ions. Since the design is based on widely available semiconductor optical amplifier technology, similar lasers can be realized for virtually any wavelength in the near-infrared, and the coherence properties and output power allow for efficient second harmonic generation. No closed-loop frequency stabilization for addressing Doppler-or naturally-broadened, dipole-allowed transitions is needed, and the light source can be turned on and off during a measurement cycle with sub-microsecond response time. As a case study, a 921.7-nm laser with an output power of 20 mW and a linewidth of 10 GHz is realized, which is then frequency doubled to 460.9-nm for excitation of strontium as the first step in photo-ionization. The excitation efficiency is compared to that achievable with a narrow-linewidth distributed Bragg reflector laser as well as to theory.

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Long-term relative stability of thermistors: Part 2

Cited by 17 publications

References 1 publication

Challenges and solutions for long-term permafrost borehole temperature monitoring and data interpretation

Challenges and solutions for long-term permafrost borehole temperature monitoring and data interpretation

Optimization and temperature mapping of an ultra-high thermal stability environmental enclosure

Broadband lasers for photo-ionization and repumping of trapped ions

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