| 摘要 |
<p>A stress wave load cell (10) comprises a propagation member (12) to which is acoustically coupled a transmitting transducer (22) and a receiving transducer (24). Electrical pulses are supplied to the transducer (22) from a pulse generator and the electrical pulses are converted into stress wave signals which propagate through the propagation member (12). The transducer (24) detects the stress wave after propagation through the propagation member (12) and supplies an electrical signal to a processor which gives a measure of the load applied on the load cell (10). Damping members (14,16) apply a damping load on the propagation member (12) when a load is applied to the load cell (10). The damping members (14,16) damp the propagation of the stress waves in the propagation member (12) and the decay rate of the diffuse stress wave field set up in the propagation member is dependent upon the load applied on the load cell (10).</p> |
