| 摘要 |
A technology is disclosed for holding the test subject contact surface temperature below a predetermined value without providing a temperature sensor or setting ultrasonic wave output excessively low and, according to this technology, reflex time t 1, which passes through oil 6, is reflected by the inner surface of window 5, and is returned via oil, and reflex time t 2, which passes through the window, is reflected by the outer surface of the window, and returned via window or oil, are detected, <?in-line-formulae description="In-line Formulae" end="lead"?>sound velocity of window=(thickness of windowx2)/(t2-t1)<?in-line-formulae description="In-line Formulae" end="tail"?> is measured, and the surface temperature of the window is detected from this measured sound velocity.
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