초록 ▼

The method and arrangement contemplates transmitting externally triggered trigger pulses by means of a magnetostrictive line or conductor and such produces echo pulses. Displacement path and time oscillator pulses are counted by two counter groups, and there is computed from the counter state the ve

The method and arrangement contemplates transmitting externally triggered trigger pulses by means of a magnetostrictive line or conductor and such produces echo pulses. Displacement path and time oscillator pulses are counted by two counter groups, and there is computed from the counter state the velocity-corrected position of a measuring head. Consequently, with a higher measuring rate there can be appreciably increased the accuracy of the evaluation of the pulses delivered by the ultrasonic measuring system, there can be obtained further measuring data (velocity and acceleration) by means of the moving measuring head, and there is possible an absolute measurement. Additionally, the resolution of the measured displacement path or distance can be randomly selected by means of the frequency of the displacement path or distance oscillator.

대표청구항 ▼

In a method for the evaluation of signals from an ultrasonic distance measuring system, especially for machine tools, comprising a magnetostrictive conductor along with which there can be displaced a measuring head containing permanent magnet means and by means of which there are transmitted trigger

In a method for the evaluation of signals from an ultrasonic distance measuring system, especially for machine tools, comprising a magnetostrictive conductor along with which there can be displaced a measuring head containing permanent magnet means and by means of which there are transmitted trigger pulses which set a flipflop and lead to echo pulses in the permanent magnet means which reset the flipflop and are received by a stationary receiver at the measuring system, and within a signal transit time (herein referred to as transit time pulse) corresponding to the time between each trigger pulse and the received echo pulse there are counted in a distance counter the pulses generated by a distance oscillator as a measure for the displacement path between the permanent magnet means and a fixed reference point, the improvement which comprises the steps of: (a) externally triggering the trigger pulses; (b) counting in addition to the distance oscillator pulses counted during a transit time pulse the pulses of a time oscillator between a first trigger pulse and a second trigger pulse by means of a time counter; (c) counting by means of a further distance counter the pulses of the distance oscillator during the next transit time pulse and counting by means of a further time counter the pulses of the time oscillator between the second trigger pulse and a third trigger pulse; (d) computing from the determined counter states: (i) the position of the measuring head XGn=NXnㆍD wherein: n=the last of a plurality of transit time pulses XGn=the measured position value after n-transit time pulses NX=the number of distance counter pulses within a transit time pulse Dx =distance increment =VL/fW = [Figure] (ii) the mean velocity of the measuring head [Figure] wherein: Vn=the velocity of the measuring head after n-transit time pulses D1/fT=1/time oscillator frequency NTn=number of time counter pulses between the (n-1) and the n-th trigger pulse; and (iii) a velocity-correction term for the position XGn of the measuring head computed during step (i) XV=VnㆍTLn=Vnㆍ(NXn/fW) wherein: TL=the time duration of the n-th transit time pulse; and (e) delivering as the evaluation result the velocity-corrected measuring head position XA=XG+XV and/or the mean measuring head velocity V.