Method for measuring thermal diffusivity
    5.
    发明授权
    Method for measuring thermal diffusivity 失效
    测量热差的方法

    公开(公告)号:US3570302A

    公开(公告)日:1971-03-16

    申请号:US3570302D

    申请日:1968-09-20

    Inventor: SAUER HAROLD A

    CPC classification number: G01N25/18

    Abstract: THE THERMAL DIFFUSIVITY AND SPECIFIC HEAT OF MATERIALS IN THIN SECTIONS IS MEASURED AT LOW AND MODERATE TEMPERATURES BY A TRANSIENT HEAT FLOW METHOD WHICH EMPLOYS A SAMPLE PROBE AND A DUAL CHAMBER VESSEL. A SMALL DIAMETER SAMPLE IS HELD ON THE PROBE, WHICH IS SUPPORTED IN THE UPPER CHAMBER. AFTER THE SAMPLE HAS BEEN EQUILIBRATED AT A CHOSEN TEMPERATURE, IT IS QUICKLY LOWERED, MECHANICALLY, THROUGH A TRAP INTO CONTACT WITH A LIQUID IN THE LOWER CHAMBER, WHICH IS ISOLATED FROM THE UPPER CHAMBER, AND WHICH IS MAINTAINED AT A DIFFERENT TEMPERATURE. THE LOWERING IS CONDUCTED IN SUCH A MANNER THAT ONLY THE UNDER OR NEAR SURFACE OF THE SPECIMEN IS BROUGHT IN CONTACT WITH THE LIQUID. THE TEMPERATURE-TIME HISTORY OF THE FAR SURFACE, OBTAINED FROM A THERMOCOUPLE ATTACHED TO THE CENTER OF THIS SURFACE, IS RECORDED ON AN OSCILLOSCOPE.

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