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THERMOMETER USING DIFFERENTIAL TEMPERATURE MEASUREMENTS

[Category : - HEALTH]
[Viewed 1347 times]

The thermometer using differential temperature measurements utilizes a pair of adjacent temperature sensors in order to measure the temperature of a common surface over a pre-selected period of time. The thermometer includes a housing and first and second thermistors mounted adjacent one another on the housing. The first and second thermistors are positioned against the surface, which can be a body part (for oral, rectal or axial body temperature measurements) or can be any other desired surface for which a spot check temperature reading is desired. A programmable current source pre-heats the second thermistor to a pre-selected temperature, while the first thermistor is initially at room temperature. A controller inside the housing causes both the first and second thermistors to take instantaneous temperature measurements of the surface at two successive times.; The controller linearizes the measurements to predict the temperature of the surface, which is then displayed to the user.

NOVELTY
The thermometer has a programmable current source for preheating
first thermistor to preselected temperature, where the first thermistor is at room temperature. A temperature measurement unit measures temperature with first thermistor and second thermistor at first time. The measurement unit measures temperature with the first and second thermistors at second time. A calculation unit calculates slopes of a linearized temperature measurement curve associated with the first and second thermistors, and calculates temperature of a surface. A display displays the temperature.
USE
Thermometer for measuring temperature of patient's body for a medical purpose. Can also be used for measuring temperature during certain chemical reactions.

ADVANTAGE
The pair of thermistor allow for a very small part of the curve to be used for evaluating the temperature measurement such that accurate temperature can be measured by using a dual thermistor technique. The thermometer measures smaller temperature range for greater linearity of the curve, thus increasing accuracy in prediction, and hence achieving high performance and sensitivity over the relatively small temperature range.

Patent publications:

US 9267848

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ittmo (Saudi Arabia)

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