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In a method and apparatus for measuring temperature by using a state change of a working fluid, a temperature measurement is executed in a manner such that the working fluid is initially supplied at a constant mass flow rate into a flow channel having a throttle portion at a temperature-sensitive po

In a method and apparatus for measuring temperature by using a state change of a working fluid, a temperature measurement is executed in a manner such that the working fluid is initially supplied at a constant mass flow rate into a flow channel having a throttle portion at a temperature-sensitive portion. Upon the measurement of a pressure difference between opposite ends of the throttle portion, the temperature can be determined through a calculation using the measured pressure difference. The temperature measuring apparatus includes a source of a working fluid and a probe. The probe includes an external cylinder closed at one of its ends and an internal cylinder which is accommodated in the external cylinder and has a capillary tube at its forward end. The apparatus further includes a supply tube for introducing the working fluid from the source into either the internal cylinder or the external cylinder, and a pressure control device. A mass flow control device is further disposed in series with the supply tube to control the mass flow rate. A differential pressure gauge for detecting a pressure drop across the capillary tube and a temperature determining device for determining the temperature in accordance with a signal output from the differential pressure gauge is included in the temperature measuring apparatus.

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A fluidic resistance type temperature measuring apparatus for measuring a temperature, comprising: a source of a working fluid; temperature-sensitive means for providing a pressure drop for said working fluid; said temperature-sensitive means including, an external cylinder closed at one of its end,

A fluidic resistance type temperature measuring apparatus for measuring a temperature, comprising: a source of a working fluid; temperature-sensitive means for providing a pressure drop for said working fluid; said temperature-sensitive means including, an external cylinder closed at one of its end, an internal cylinder disposed inside said external cylinder, and a capillary tube positioned at a forward end of said internal tube, said capillary tube and said external cylinder having a structural relationship such that said pressure drop is generated across said capillary tube; a supply tube for introducing said working fluid from said source into said internal cylinder; pressure control means, disposed in series with said supply tube, for controlling said working fluid pressure; mass flow control means, disposed in series with said supply tube and said pressure control means, for controlling said working fluid\s mass flow rate; differential pressure gauge means, operatively connected to said temperature-sensitive means, for detecting said pressure drop across said capillary tube and for providing an output signal corresponding to said pressure drop; and temperature determining means, operatively connected to said differential pressure gauge means, for determining the temperature in accordance with said output signal from said differential pressure gauge means.