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ultimate zip cracker activatioThe present invention generally relates to the use of semi-conductors and other solid-state electronics for the detection of temperature. More specifically, the invention is directed to a solid-state temperature sensor having a relatively small size, low cost, high sensitivity and high reliability.
Many types of temperature sensors are well known in the art. Generally, these sensors are designed to respond to changes in ambient temperatures by altering their electrical properties. For example, a thermocouple is a well known type of temperature sensor. Thermocouples are typically constructed by disposing a pair of dissimilar conductors in close proximity so that the conductors create a very small electrical potential difference when a change in temperature occurs. Thus, an insulated conductor is connected to each end of the thermocouple so as to complete a circuit. Because the thermocouple is a potential device, special care must be exercised to insure that any changes in ambient temperatures do not alter the potential difference between the ends of the thermocouple.
In addition to thermocouples, there are many other types of temperature sensing devices. For example, thermistors, bolometers and thermopiles all respond to changes in temperature. These devices are generally characterized as being substantially large, bulky and expensive. In addition to size and cost, these devices generally require an external power source for operation.
Many applications of temperature sensors have not been met by the prior art devices. For example, micro-electromechanical (MEMS) temperature sensors have been developed to address problems such as the cost and size of conventional thermocouples. These MEMS type temperature sensors are fabricated from small, flexible solid state elements in the form of a diaphragm. The diaphragm bends to change its area, and thereby its resistance. The resistance change is then used to detect the temperature change. The small size of the diaphragm minimizes the overall size of the sensor. In addition, the use of MEMS allows the sensor to be small and cost effective.
Although the use of MEMS sensors has proven to be successful in be359ba680
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