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US 5,116,136 AGranted
Temperature measurements using thermistor elements
AssigneeMassachusetts Institute of Technology
InventorsWilliam H. Newman, Ralph G. Burgess
Life of this patent
Estimating the term…
Abstract
A technique for measuring temperature by a thermistor sensor which technique provides for a linearization of the temperature sensed by the thermistor by utilizing circuitry which responds to the thermistor and produces an output which is an exponential function of the temperature sensed by the thermistor. A further circuit, such as a logarithmic amplifier, responds to such output to provide a signal which represents the temperature.
Claims14
A temperature sensing system comprising
- non-linear temperature sensing means;
- a current source for providing a substantially constant current for said temperature sensing means;
- a circuit including a resistance means and a counter-voltage means, said temperature sensing means and said current source being connected in said circuit so that said resistance means is in parallel with said temperature sensing means and said counter-voltage means is in series with said temperature sensing means for producing an intermediate voltage output which is a substantially exponential function of the temperature sensed by said temperature sensing means.
A temperature sensing system comprising
- non-linear temperature sensing means for sensing a temperature;
- a current source for providing a substantially constant current to said non-linear temperature sensing means;
- said non-linear temperature sensing means and said current source being connected in a circuit which includes further means connected to said temperature sensing means and responsive to the temperature sensed by said temperature sensing means, said temperature sensing means and said further means providing an intermediate output which is an exponential function of the temperature sensed by said temperature sensing means;
- and
- means responsive to said intermediate output for producing an output signal which is a substantially linear function of said temperature sensed by said temperature sensing means.
2 more elements
Dependencies are inferred from the claim text.