A thermistor comprising a monocrystalline semiconductor substrate having at a surface thereof both first and second electrically energized electrodes and means for providing a higher current density at the central region of this surface than at the edge of this surface and at the other surfaces of the substrate, which means comprises at least one electrically-floating field-conducting electrode between the first and second electrode. In one embodiment, the field-conducting electrode is spaced from the edge of the surface on which it is located. In another embodiment, the thermistor also includes a conducting edge limitation.
The temperature coefficient of resistance (TCR) of a resistor having a layer of a resistance material on a surface of a substrate and a termination layer of a conductive material at opposite ends of the resistance layer is adjusted by changing the area of at least one of the termination layers. The area of the termination layer is changed by removing a portion of the termination layer. The portion of the termination layer can be removed by making a cut through the termination layer which extends along a line across at least a portion of the termination layer. This method can be used to form matched pairs of resistors by first adjusting the resistance value of at least one of a pair of the resistors at room temperature to provide the resistors with substantially the same resistance values. The TCR of one of the resistors is then adjusted by removing a portion of one of the terminations of the resistor until both resistors have substantially the same TCR.
The invention is directed to a thermistor created using a monocrystalline form of a nickel-manganese-oxide cubic spinel and methods of using same as a sensor in an electrical circuit.
A pressure sensor includes a housing portion with a fluid inlet and a polymer element within the housing portion. The polymer element may be coated with piezoresistive material to form a first resistor and may have associated electrodes. The polymer element includes a first resistance value that changes to a second resistive value in a response to a predetermined condition. The pressure sensor may also include a second polymer element that includes a first resistance value that changes to a second resistive value in a response to a predetermined condition.
The present invention relates to making sensors by cutting pieces from a boule or ingot of a metal oxide single crystal. The sensors produced are also described.
A method of manufacturing high temperature thermistors. A polycrystalline thermistor body is formed from a material selected from a list consisting of bulk polycrystalline Si with intrinsic conductivity and bulk polycrystalline Ge with intrinsic conductivity. At least one ohmic contact is formed on at least one surface of the polycrystalline thermistor body.
