| 摘要 |
An apparatus for measuring physical characteristics comprises means to determine when an object (not shown) to be tested is correctly placed in the recess (12) of a main body (10). In a preferred embodiment the object is a foot and the device is useful in determining the presence of osteoporosis. An ultrasonic transmitter is resiliently mounted in a first container (30) slidably received in the main body (10). The transmitter is urged towards the object but its movement is restricted. A piezoelectric ultrasonic receiver (48) spaced from the transmitter also projects towards the body. The ultrasonic receiver is resiliently mounted in a second hollow container slidably received in the main body (10). The object is subjected to a first frequency obtained by resonating the transmitter in the thickness mode and a second lower frequency obtained by resonance in the radial mode.
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