Steam turbine blade arrival time processor with automatic gain c

Details Steam turbine blade arrival time processor with automatic gain c Steam turbine blade arrival time processor with automatic gain c

1988-12-22

1991-05-14

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Displacement

73660, 307264, 307354, 307515, 307520, 32420712, 32420715, 32420722, 328110, 328167, 328168, G01H 1102, G01B 714, H03K 5153, H03L 500

Patent

active

050159496

ABSTRACT:
An apparatus for detecting turbine blade passing times includes a sensor for producing an input signal each time a blade passes the sensor. Automatic gain control circuitry including a digital multiplier, peak detector and error amplifier regulates the amplitude of the input signal. A zero-crossing detector produces an output signal each time the input signal crosses a reference axis. A pre-trigger comparator produces a gating signal coinciding with the expected arrival time of the blade at the sensor. A gating device is responsive to the gating signal for conducting output signals which occur during the expected arrival time of the blade at the sensor. A monostable vibrator produces a digital pulse coinciding with the time at which the blade passes the sensor.

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patent: 4573358 (1986-03-01), Luongo
patent: 4593566 (1986-06-01), Ellis
patent: 4609869 (1986-09-01), Metcalf
patent: 4922757 (1990-05-01), Rozelle et al.

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