Measurement of wave propagation power flow in structures
CA 1257920 A · Owner: The Secretary Of State For Defence In Her Britannic Majesty'S Government Of The United Kingdom Of Great Britain And Northern Ireland · Inventors: Redman-White, William
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A vibration sensor for measuring the flow of vibrational energy through a structure comprises four accelerometers 24-27 placed in cruciform arrangement on the surface of a structure. The signals from the accelerometers are processed in pairs using sum/difference amplifiers 36-40 to give two rotational (41 42) and one, translational (43) acceleration signal. The acceleration signals are frequency modulated (46-48) by a local oscillator 53 of preselected frequency, low-pass filtered (62-64) and the rotational acceleration signals (68, 70) then multiplied (72 73) in phase, quadrature (54) with the translational acceleration signal 69. The DC components of the resulting signals 76 are …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted July 25, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 25, 2006.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.