Apparatus and method to accomplish turbine meter output pulse multiplication

Claim 2

A frequency multiplying circuit for increasing the output frequency resolution of a turbine meter, comprising a turbine meter pickup coil in which a velocity waveform signal having at least a first frequency is induced, one side of said coil being connected to ground potential, equalizing network means connected to the other side of said coil for receiving said velocity waveform signal having at least a first frequency and converting said signal to a relatively constant amplitude voltage waveform, filter means connected to said equalizing network means for receiving said relatively constant amplitude voltage waveform signal having at least a first frequency, amplifying said signal, and passing said signal between predetermined minimum and maximum frequencies, multiplying means connected to said filter means for receiving said signal having at least a first frequency and generating a signal having at least a second frequency which is a preselected multiple of said first fRequency, a Schmidt trigger circuit for receiving said signal of at least a second frequency and generating a first series of square-wave pulses representative of said second frequency, a differentiating network for receiving said first series of pulses and generating a second series of pulses corresponding to the positive going portion of each square-wave pulse of said first series of pulses, an inverter for inverting said first series of pulses, a differentiating network for receiving said first series of pulses and generating a third series of pulses corresponding to the negative going portion of each square-wave pulse of said first series of pulses, combining means for combining said second and third series of pulses to form a fourth series of pulses corresponding to the positive and negative going portions of each pulse of said first series of pulses, and pulse forming means for receiving said fourth series of pulses and generating a fifth series of pulses in response thereto representative of a third frequency said third frequency being double said second frequency.

Claim 3

The circuit described in claim 1, wherein said combining means comprises a NAND gate for receiving said second and third series of pulses and passing both said series to form said fourth series of pulses.

Claim 4

The circuit described in claim 1, wherein said pulse forming means comprises a monostable multivibrator for receiving said fourth series of pulses and generating said fifth series of pulses.

Claim 5

A frequency multiplying circuit for increasing the output frequency resolution of a turbine meter, comprising a turbine meter pickup coil in which a velocity waveform signal having at least a first frequency is induced, one side of said coil being connected to ground potential, equalizing network means connected to the other side of said coil for receiving said velocity waveform signal having at least a first frequency and converting said signal to a relatively constant amplitude voltage waveform, a first order low pass filter series connected to said equalizing network means for receiving said relatively constant amplitude voltage waveform signal having at least a first frequency, a first order high pass filter series connected to said first order low pass filter and functioning principally as a gain stage for amplifying said signal, a third order low pass filter series connected to said first order high pass filter and passing said signal between predetermined minimum and maximum frequencies, multiplying means connected to said filter means for receiving said signal having at least a first frequency and generating a signal having at least a second frequency which is a preselected multiple of said first frequency, first pulse generating means for receiving said signal of at least a second frequency and generating a first series of square-wave pulses representative of said second frequency, second pulse generating means for receiving said first series of pulses and generating a second series of pulses corresponding to the positive going portion of each square-wave pulse of said first series of pulses, third pulse generating means for receiving said first series of pulses and generating a third series of pulses corresponding to the negative going portion of pulses corresponding to the negative going portion of each square-wave pulse of said first series of pulses, combining means for combining said second and third series of pulses to form a fourth series of pulses corresponding to the positive and negative going portions of each pulse of said first series of pulses, and pulse forming means for receiving said fourth series of pulses and generating a fifth series of pulses in response thereto representative of a third frequency, said third frequency being double said second frequency,

Claim 6

A frequency multiplying circuit for increasing the output frequency resolution of a turbine meter, comprising a turbine meter pickup coil in which a velocity waveform signal having at least a first frequency is induced, one side of said coil being connected to ground potential, equalizing network means connected to the other side of said coil for receiving said velocity waveform signal having at least a first frequency and converting said signal to a relatively constant amplitude voltage waveform, a first order low pass filter series connected to said equalizing network means for receiving said relatively constant amplitude voltage waveform signal having at least a first frequency, a first order high pass filter series connected to said first order low pass filter and functioning principally as a gain stage for amplifying said signal, a third order low pass filter series connected to said first order high pass filter and passing said signal between predetermined minimum and maximum frequencies, multiplying means connected to said filter means for receiving said signal having at least a first frequency and generating a signal having at least a second frequency which is a preselected multiple of said first frequency, first pulse generating means for receiving said signal of at least a second frequency and generating a first series of square-wave pulses representative of said second frequency, second pulse generating means for receiving said first series of pulses and generating a second series of pulses corresponding to the positive going portion of each square-wave pulse of said first series of pulses, third pulse generating means for receiving said first series of pulses and generating a third series of pulses corresponding to the negative going portion of pulses corresponding to the negative going portion of each square-wave pulse of said first series of pulses, combining means for combining said second and third series of pulses to form a fourth series of pulses corresponding to the positive and negative going portions of each pulse of said first series of pulses, and pulse forming means for receiving said fourth series of pulses and generating a fifth series of pulses in response thereto representative of a third frequency, said third frequency being double said second frequency,

Claim 7

The circuit described in claim 4, wherein said third order low pass filter is a Butterworth filter stage.

Claim 8

A frequency multiplying circuit for increasing the output frequency resolution of a turbine meter, comprising a turbine meter pickup coil in which a velocity waveform signal having at least a first frequency is induced, one side of said coil being connected to ground potential, equalizing network means connected to the other side of said coil for receiving said velocity waveform signal having at least a first frequency and converting said signal to a relatively constant amplitude voltage waveform signal, a first order low pass filter series connected to said equalizing network means for receiving said relatively constant amplitude voltage waveform signal having at least a first frequency, a first order high pass filter series connected to said first order low pass filter and functioning principally as a gain stage for amplifying said signal, a third order low pass filter series connected to said first order high pass filter and passing said signal between predetermined minimum and maximum frequencies, and multiplying means connected to said equalizing network means for receiving said signal having at least a first frequency and generating a signal having at least a second frequency which is a preselected multiple of said first frequency.

Claim 9

A frequency multiplying circuit for increasing the output frequency resolution of a turbine meter, comprising a turbine meter pickup coil in which a velocity waveform signal having at least a first frequency is induced, one side of said coil being connected to ground potential, equalizing network means connected to the other side of said coil for receiving said velocity waveform signal having at least a first frequency and converting said signal to a relatively constant amplitude voltage waveform signal, a first order low pass filter series connected to said equalizing network means for receiving said relatively constant amplitude voltage waveform signal having at least a first frequency, a first order high pass filter series connected to said first order low pass filter and functioning principally as a gain stage for amplifying said signal, a third order low pass filter series connected to said first order high pass filter and passing said signal between predetermined minimum and maximum frequencies, and multiplying means connected to said equalizing network means for receiving said signal having at least a first frequency and generating a signal having at least a second frequency which is a preselected multiple of said first frequency.

Claim 10

The circuit described in claim 6, including first pulse generating means for receiving said signal of at least a second frequency and generating a first series of square-wave pulses representative of said second frequency, and second pulse generating means for receiving said first series of pulses and generating a second series of pulses in response thereto representative of a third frequency, said third frequency being a predetermined multiple of said second frequency.

Claim 11

The circuit described in claim 7, wherein said second pulse generating means comprises third pulse generating means for receiving said first series of pulses and generating a third series of pulses corresponding to the positive going portion of each square-wave pulse of said first series of pulses, fourth pulse generating means for receiving said first series of pulses and generating a fourth series of pulses corresponding to the negative going portion of each square-wave pulse of said first series of pulses, combining means for combining said third and fourth series of pulses to form a fifth series of pulses corresponding to the positive and negative going portions of each pulse of said first series of square-wave pulses, and pulse forming means for receiving said fifth series of pulses and generating said second series of pulses in response thereto.

Claim 12

The circuit described in claim 7, wherein said first pulse generating means comprises a Schmidt trigger circuit to generate said first series of square-wave pulses representative of said signal of at least a second frequency.

Claim 13

The circuit described in claim 8, wherein said third pulse generating means comprises a differentiating network that generates said third series of pulses corresponding to the positive going portion of each of said square-wave pulses of said first series of pulses.

Claim 14

The circuit described in claim 8, wherein said fourth pulse generating means comprises an inverter for inverting said first series of pulses, and a differentiating network that generates said fourth series of pulses corresponding to the negative going portion of each of said square-wave pulses of said first series of pulses.

Claim 15

The circuit described in claim 8, wherein said combining means comprises a NAND gate for receiving said third and fourth series of pulses and passing both said series to form said fifth series of pulses.

Claim 16

The circuit described in claim 8, wherein said pulse forming means comprises a monostable multivibrator for receiving said fifth series of pulses and generating said second series of pulses.