Device for measuring torsion in a shaft

Claim 1

A device for measuring the torsion in a shaft having a known relationship between applied torque and torsion of the shaft, comprising two axially spaced indicating marks located on said shaft, two pulse transmitter means, each located in the vicinity of one of said marks and adapted to emit a pulse upon the passage of said mark past said transmitter, one pulse shaper each connected to the output of one of the said impulse transmitters, each of the said pulse shapers consisting of a limiter stage, a Schmitt trigger whose input is connected to the output of the said limiter stage, a phase-reverter stage connected to the output of the said Schmitt trigger and a monostable vibrator whose input is connected to the output of the said phase-reverter stage, the said pulse shaper developing square wave pulses of constant height and width, the ascending slope of the said square wave pulses being synchronized with the voltage zero point of the pulses generated by the said impulse transmitters, further comprising a bistable switch step whose inputs are connected each to the output of one of the said pulse shapers, an integrator circuit connected to the output of the bistable switch step and comprising a controllable resistor controlling the time constant of the integrator circuit, a peak-voltage measurement device whose input is connected to the output of the said integrator circuit, a device for balancing the effect of the rotational speed upon the width of the square wave pulse developed at the output of the said bistable switch step, the said device being connected to the output of one of the said impulse transmitters and generating a direct voltage proportionate to the rotational speed of the said shaft, the said direct voltage controlling the controllable resistor of the said integrator circuit, in such a manner that the same peak value of the integrated voltage is developed at the output of the said peak-voltage measuring device at a constant torsion of the said shaft irrespective of its rotational speed.

Claim 2

A device for measuring the torsion in a shaft having a known relationship between applied torque and torsion of the shaft, comprising two axially spaced indicating marks located on said shaft, two pulse transmitter means, each located in the vicinity of one of said marks and adapted to emit a pulse upon the passage of said mark past said transmitter, one pulse shaper each connected to the output of one of the said impulse transmitters, each of the said pulse shapers consisting of a limiter stage, a Schmitt trigger whose input is connected to the output of the said limiter stage, a phase-reverter stage connected to the output of the said Schmitt trigger and a monostable vibrator whose input is connected to the output of the said phase-reverter stage, the said pulse shaper developing square wave pulses of constant height and width, the ascending slope of the said square wave pulses being synchronized with the voltage zero point of the pulses generated by the said impulse transmitters, further comprising a bistable switch step whose inputs are connected each to the output of one of the said pulse shapers, an integrator circuit connected to the output of the bistable switch step and comprising a controllable resistor controlling the time constant of the integrator circuit, a peak-voltage measurement device whose input is connected to the output of the said integrator circuit, a device for balancing the effect of the rotational speed upon the width of the square wave pulse developed at the output of the said bistable switch step, the said device being connected to the output of one of the said impulse transmitters and generating a direct voltage proportionate to the rotational speed of the said shaft, the said direct voltage controlling the controllable resistor of the said integrator circuit, in such a manner that the same peak value of the integrated voltage is developed at the output of the said peak-voltage measuring device at a constant torsion of the said shaft irrespective of its rotational speed.