| 摘要 |
896,102. Measuring acceleration electrically. ENGLISH ELECTRIC CO. Ltd. Sept. 27, 1957 [Oct. 3, 1956], No.30199/56. Drawings to Specification. Class 40 (1). In an accelerometer, a mass is supported in a rigid framework by several tensioned, vibrating strings or wires. Upon acceleration of the framework, the inertial forces due to the acceleration of the mass, alter the string tensions and the resultant vibration frequency changes are a measure of the acceleration. The strings are maintained in vibration by exciter units and the vibrations are detected at pick-offs which provide electrical signals. It is stated that if the sum of the frequencies is maintained constant, the difference frequency is in a linear relationship with the acceleration. This is effected by a feed-back loop which detects the scan of the frequencies and applies a control to the strings to maintain their sum at a fixed value, by changing the tension in the strings by heating. The strings form single turn secondary windings of transformers and a heating current is induced in them by a toroidal primary wound round a circular magnetic core embracing each wire and energized in correspondence with the sum frequency control signal. Specification 896,101 is referred to. |
