The difference between contact and non-contact heat flow sensor

First of all, the heat flow sensor is divided into contact type and non-contact type. Contact heat flow sensors measure conduction heat flow, convective heat flow, and radiative heat flow; non-contact heat flow sensors mainly measure radiative heat flow and convective heat flow. Heat flow measurement can provide some very important and detailed data that cannot be obtained by temperature measurement alone. 1. The contact heat flow sensor should be attached to or embedded in the measured object, such as building material heat flow measurement, pipeline heat flow measurement, boiler heat flow measurement, skin heat flow measurement, etc. The selection of this type of heat flow sensor mainly depends on the application, which determines the measurement temperature and the size of the sensor. The high-precision high-temperature heat flow sensor is made of ceramic high-temperature material with a stainless steel housing. Heat flow in extreme environments (eg; kiln walls, furnace tubes, nuclear power generators, etc.) can be accurately measured, recorded and controlled. 2. The non-contact heat flow sensor has a certain distance from the object to be measured, and measures radiative heat flow and convective heat flow; this is generally divided into a total heat flow sensor and a radiant heat flow sensor. The total heat flow sensor includes radiative heat flow and convective heat flow; the radiative heat flow sensor only measures the radiative heat flow, and generally a window is added to the total heat flow sensor to shield the convective heat flow. From the production principle, this heat flow sensor is divided into Gardon type heat flow sensor and Schmidt Boelter sensor (plug heat flow sensor). Non-contact heat flow sensors are widely used in ground and flight aviation testing, fire testing, flammability testing heat flow standards, heat transfer research, material development, and kiln development.

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