Influence de la pression sur la résistivité d'une thermistance

Tavernier, Paul; Prache, Pierre

doi:10.1051/jphysrad:01952001307-9042301

Cited by 9 publications

(5 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A moderate amount of experimental evidence indicates that hydrostatic pressure has an effect on the resistance of thermistors. Investigations by Misener and Thompson (1952) and by Tavernier and Prache (1952) show a small but definite decrease in thermistor resistance with increasing pressure. The resultant error would therefore take the form of an apparent increase in temperature, and a correction for the effect of pressure would reduce slightly the apparent temperatures.…”

Section: Effect Of Pressurementioning

confidence: 88%

Bikini and nearby atolls, Marshall Islands; geothermal measurements on Eniwetok and Bikini Atolls

Swartz¹

1958

Professional Paper

View full text Add to dashboard Cite

Equipment and techniques________________ 713 Thermistors______________________________ 713 Cables__.________________________ 713 Conversion of resistance to temperature _______________ 715 Reliability of data.______________________ 715 Sensitivity of instruments______________________ 715 Precision of measurements_______________________ 715 Accuracy of measurements.____________________ 716 Effects of systematic errors___-_-_-____-716 Bridge temperature_____________________ 716 Conductor temperature._________________ 716 Thermistor heating_____________________ 717 Incomplete equilibrium._________________ 717 Thermistor calibration_________________ 717 Thermistor stability___________________ 717 Effect of pressure_____________________ 717 Page Reliability of data-Continued Accuracy of measurements-Continued Accuracy of data__________-___________-____ 718 Temperature____________ _____________ 718 Depth______________________ 718 Temperature observations___________________________ 718 Eniwetok Atoll________ _ ____________ 718 Drill hole F-l, Elugelab island. _ ________ 718 Drill hole E-l, Parry Island____________ 721 Bikini Atoll-drill hole 2B, Bikini island._. ____. 723 Analysis of observations__________________________-_-724 Effects of heat of drilling______ ___________ 724 Comparison with Pacific coast thermal profiles. _ _ _ _ 725 Comparison with ocean temperatures in the Marshall Islands area_______________________-_____ 725 Tidal fluctuations in the drill holes.______________ 729 Comparison with Kita-daito-jima.________________ 731 Temperature gradients______________________-_-Forced convection as a method of heat transfer in coral atolls-.________.

show abstract

Section: Effect Of Pressurementioning

confidence: 88%

Bikini and nearby atolls, Marshall Islands; geothermal measurements on Eniwetok and Bikini Atolls

Swartz¹

1958

Professional Paper

View full text Add to dashboard Cite

show abstract

“…The pressure effect on thermistor resistance was described by Tavernier and Prache (1952) and Misener and Thompson (1952); a brief discussion by is amplified here. In each study, the pressure chamber was placed in a constant-temperature bath, controlled to ±0.01°C; the absolute value of the bath temperature was less important than its constancy.…”

Section: Dependence Of Resistance On Pressurementioning

confidence: 80%

Properties of thermistors used in geothermal investigations; Preparation of thermistor cables used in geothermal investigations

Robertson¹,

Raspet²,

Swartz³

et al. 1966

View full text Add to dashboard Cite

“…A healthy eye has an average intraocular (anterior chamber) pressure of 15 mmHg, while an eye with abnormal IOP (e.g., glaucoma) has an overpressure of 21 mmHg, which is about 30% higher. According to Tavernier et al [ 24 ], there is a negative linear relationship between pressure and resistivity variations. Either the resistivity of eyes with glaucoma will present 30% ρ glaucoma less than that of a healthy eye, or about ρ glaucoma = 0.465 Ω.m.…”

Section: Methodsmentioning

confidence: 99%

Ocular Phantom-Based Feasibility Study of an Early Diagnosis Device for Glaucoma

Moreno¹,

C²,

Grounauer³

2021

Sensors

View full text Add to dashboard Cite

Glaucoma causes total or partial loss of vision in 10% of people over the age of 70, increasing their fragility and isolation. It is characterised by the destruction of the optic nerve fibres, which may result from excessively high intraocular pressure as well as other phenomena. Diagnosis is currently reached through a combination of several checks, mainly of the eyes’ fundus, tonometry and gonioscopy. Prior to validation for human subjects, the objective of this study is to validate whether ocular phantom-based models could be used to diagnose glaucoma using an onboard system, which could, even at home, prevent the early-stage development of the pathology. Eight phantoms modelling healthy eyes and eight phantoms modelling eyes with glaucoma due to excessive intraocular pressure were measured using an onboard system, including lens and electrophysiology electronics. We measured the actual average Zr (real part of impedance) impedance of 160.9 ± 24.3 ohms (glaucoma ocular phantom models) versus 211.9 ± 36.9 ohms (healthy ocular phantom models), and an average total water volume (Vt) of 3.02 ± 0.35 mL (glaucoma ocular phantom models) versus 2.45 ± 0.28 mL (healthy ocular Phantoms). On average, we obtained 51 ohms (−24.1%) less and 0.57 mL (22.9%) of total water volume more, respectively. Normality tests (Shapiro–Wilk) for Vt and Zr indicate p < 0.001 and p < 0.01, respectively. Since these variables do not respect normal laws, unmatched Mann–Whitney tests were performed indicating a significant difference between Vt and Zr in the healthy ocular phantom models and those modelling glaucoma. To conclude, this preliminary study indicates the possibility of discriminating between healthy eyes with those with glaucoma. However, further large-scale studies involving healthy eyes and those suffering from glaucoma are necessary to generate viable models.

show abstract

Influence de la pression sur la résistivité d'une thermistance

Cited by 9 publications

References 0 publications

Bikini and nearby atolls, Marshall Islands; geothermal measurements on Eniwetok and Bikini Atolls

Bikini and nearby atolls, Marshall Islands; geothermal measurements on Eniwetok and Bikini Atolls

Properties of thermistors used in geothermal investigations; Preparation of thermistor cables used in geothermal investigations

Ocular Phantom-Based Feasibility Study of an Early Diagnosis Device for Glaucoma

Contact Info

Product

Resources

About