Thermometer using differential temperature measurements

Patent Granted Thermometer for measuring temperature of patient's body for medical purpose, has calculation unit for calculating slope of temperature measurement curve and for calculating surface temperature and display for displaying temperature NOVELTY The thermometer (10) 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 dualthermistor 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.