Laser optical torquemeter
First Claim
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1. Apparatus for measuring torque transmitted by a rotating shaft S1, that comprises:
- a sensing member S3 mechanically coupled axially with shaft S1 and shaft S2 through which torque is transmitted, said sensing member S3 comprising a torsional shaft S4 and a tubular transfer shaft S5 joined rigidly at one end and free to rotate with respect to each other at the other end wherein the transfer shaft S5 contains a window at the other end;
a signal emitter 1 positioned facing the window on the sensing member S3 to emit a collimated laser beam S essentially perpendicular to the shaft S4;
a signal reflector RM positioned on the other end of said sensing member S3 in the path of said signal S from said emitter reflecting the signal received from said emitter back to a signal receiver by a light beam S'"'"' essentially perpendicular to the shaft;
a signal receiver positioned facing the window on the sensing member S3 to receive the signal S'"'"' reflected by said reflector RM and producing an electrical signal determined by the position at which the signal from said reflector impinges on said receiver, said signal receiver comprising a measurement receiver 6 generating a signal, which corresponds to the distance of a light beam incidence point A from a fixed reference point 0 in a measurement plane essentially perpendicular to the light beam S'"'"', whereby said signal indicates the relative angular displacement of the torsional shaft S4 with respect to the transfer shaft S5.
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Abstract
A device intended to measure the torque. transmitted by a rotating shaft S1. This device has no physical connection with measured shafts. It employs a laser beam S, S'"'"' and a retroreflector RM of which the plane mirrors M1 and M2 are mounted on the torsional shaft S4 and transfer shaft S5 respectively or any other optical system, and it displays the torsion or torque as a function of angular displacement of the laser beam S'"'"' It may be used to determine the torque of either stationary or rotating shafts.
24 Citations
10 Claims
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1. Apparatus for measuring torque transmitted by a rotating shaft S1, that comprises:
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a sensing member S3 mechanically coupled axially with shaft S1 and shaft S2 through which torque is transmitted, said sensing member S3 comprising a torsional shaft S4 and a tubular transfer shaft S5 joined rigidly at one end and free to rotate with respect to each other at the other end wherein the transfer shaft S5 contains a window at the other end; a signal emitter 1 positioned facing the window on the sensing member S3 to emit a collimated laser beam S essentially perpendicular to the shaft S4; a signal reflector RM positioned on the other end of said sensing member S3 in the path of said signal S from said emitter reflecting the signal received from said emitter back to a signal receiver by a light beam S'"'"' essentially perpendicular to the shaft; a signal receiver positioned facing the window on the sensing member S3 to receive the signal S'"'"' reflected by said reflector RM and producing an electrical signal determined by the position at which the signal from said reflector impinges on said receiver, said signal receiver comprising a measurement receiver 6 generating a signal, which corresponds to the distance of a light beam incidence point A from a fixed reference point 0 in a measurement plane essentially perpendicular to the light beam S'"'"', whereby said signal indicates the relative angular displacement of the torsional shaft S4 with respect to the transfer shaft S5. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. Apparatus for measuring torque transmitted by a rotating shaft S1, that comprises:
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a sensing member S3 mechanically coupled axially with shaft S1 and shaft S2 through which torque is transmitted, said sensing member S3 comprising a torsional shaft S4 and a tubular transfer shaft S5 joined rigidly at one end and free to rotate with respect to each other at the other end wherein the transfer shaft S5 contains a window at the other end; a signal emitter 1 positioned facing the window on the sensing member S3 to emit a collimated laser beam S essentially perpendicular to the shaft S4; a signal reflector RM positioned on the other end of said sensing member S3 in the path of said signal S from said emitter reflecting the signal received from said emitter back to a signal receiver by a light beam S'"'"' essentially perpendicular to the shaft; a signal receiver positioned facing the window on the sensing member S3 to receive the signal S'"'"' reflected by said reflector RM and producing an electrical signal determined by the position at which the signal from said reflector impinges on said receiver, said signal receiver comprising a measurement receiver 6 generating a signal, which corresponds to the distance of a light beam incidence point A from a fixed reference point 0 in a measurement plane essentially perpendicular to the light beam S'"'"', whereby said signal indicates the relative angular displacement of the torsional shaft S4 with respect to the transfer shaft S5; a signal receiver TT housed in transducer T and facing the temperature target T1 on sensing member of S3 to receive emitted infrared radiation from the sensing member S3 at its operation temperature. - View Dependent Claims (10)
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Specification