Stress wave load cell
US5016480A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 16, 1990 |
| Grant date | May 21, 1991 |
| Priority date | — |
| Expiry date | Feb 16, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2291/02827
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A stress wave load cell comprises a propagation member to which is acoustically coupled a transducer. Electrical pulses are supplied to the transducer from a pulse generator and the electrical pulses are converted into stress wave signals which propagate through the propagation member. The transducer also detects the stress waves after propagation through the propagation member and supplies an electrical signal to processor which gives a measure of the load applied to the load cell. Damping members which have profiled surfaces are caused to move into damping contact with the propagation members when a load is applied to the load cell. The damping members damp the propagation of the stress waves in the propagation member and the damping is proportional to the area of damping contact, the area of damping contact increases with the load applied. May be used to measure tensile load or compressive load and may be used as a touch sensitive panel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.