Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1974-04-02
1976-01-27
Mullins, James B.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324166, G01P 348
Patent
active
039355373
ABSTRACT:
Apparatus for measuring the angular movement of a body comprises a tranducer for providing a signal the frequency f.sub.i of which is dependent on the angular velocity of the body and a reference frequency source providing a reference frequency f.sub.r. An (n + m) stage binary counter is provided for counting the number of reference pulses in time period 1/f.sub.i and an (n + m) stage binary store receives a count from said counter when the latter receives a signal from the transducer. The apparatus also includes an n-stage binary rate multiplier having a first input for receiving the n least significant figures of the store, and a second input for receiving an output signal from the apparatus, the rate multiplier being arranged to generate, during the period in which the rate multiplier receives 2.sup.n binary pulses at said second input, a number of output pulses which is equal to the number of pulses applied to said first input,. Dividing means receives first input signals equal to the m most significant figures of the store in the absence of an output signal from said rate multiplier, and receives second input signals from said reference source, the dividing means producing an output signal which forms said output signal of the apparatus and which is determined by dividing the frequency reference signal by the signal applied to said first input of the dividing means. Moreover, means is provided for modifying the output signal from the dividing means when an output signal is obtained from the rate mutliplier, whereby 2.sup.n output pulses are received between successive input pulses from the transducer, the maximum value of f.sub.r /f.sub.i being <2.sup.n.sup.+m, and the minimum value of f.sub.r /f.sub.i being .gtoreq.2.sup.n.
REFERENCES:
patent: 3636545 (1972-01-01), Boyd et al.
patent: 3639753 (1972-02-01), Reich
patent: 3748580 (1973-07-01), Stevens et al.
patent: 3757167 (1973-09-01), Yoshikawa et al.
patent: 3818342 (1974-06-01), Stevens
sinha, "New High-Precision Digital Tachometer," Electronics Letters, Vol. 7, No. 8, Apr. 22, 1971, pp. 174-176.
Mullins James B.
The Lucas Electrical Company Limited
LandOfFree
Apparatus for measuring angular movement does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus for measuring angular movement, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus for measuring angular movement will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1814173