SU1483253A1 - Device for shaping pulse of origin in movement meters - Google Patents

Abstract

This invention relates to a control and measurement technique. The purpose of the invention is to improve the accuracy by eliminating the moments of false positives of the device. The device consists of an additional transducer 4 of displacements and a unit 5 for selecting the origin of the counting pulse, which includes a discriminator 6, a control key 7 and a key control disk 8. The elimination of the false alarm moments occurs due to the closure of the output of the discriminator 6 on the common bus at the moments when the converter 4 is in the non-operating zone. 1 hp f-ly, 3 ill.

Description

FIG. R

The invention relates to instrumentation engineering and can be used in displacement meters to form a zero point pulse.

The purpose of the invention is to improve the accuracy by eliminating the moments of false positives of the device.

FIG. 1 is a block diagram of the device; in fig. 2 is a block diagram of a key management unit; in fig. 3 - voltage plots showing the operation of the device.

The device consists of a series-connected displacement transducer 1, a measurement pulse generation unit 2 and a displacement direction detection unit 3, an additional displacement transducer 4 consisting of two signal receivers connected in a differential circuit and kinematically connected to the start pulse countdown. Unit 5 contains a discriminator 6, the first input of which is connected to the common bus, a control key 7 connected between the discriminator's output and the common bus, a key control unit 8 connected between the second discriminator input and the control input of the key 7, the logical inputs of the node 8 are connected to the outputs of block 3, and the amplifier 9 connected between the output of the converter 4 and the second input of the discriminator 6.

The key control unit 8 consists of an inverter 10, a comparator 11, a comparator 12, a trigger 13, the first and second inputs of which are connected to the outputs of the comparators 12 and 11, respectively, And 14 and 15 elements, the first inputs of which are connected to the first and second outputs of the trigger 13, and the second inputs are the logical inputs of node 8, the element OR 16, the inputs of which are connected to the outputs of elements 14 and 15, and the output is the output of node 8, the source 17 of the reference voltage, the output of which is connected to the second inputs of the comparators 11 and 12, the first input of comparator 12 and input of inv The interlock 11 is connected together and is the input to the node 8.

The device works as follows.

The displacement transducer 1 generates a periodic signal, the informative parameter of which depends on the displacement. Block 2 generates two series of phase-shifted output signals. The phase ratio of these signals depends on the direction of movement. The Black 3 determination of the direction of movement converts the meter signals into two signals characterizing the direction of movement: forward (+ S) and backward (-S).

The additional displacement transducer 4 generates an aperiodic signal 20 converted by the unit 5 for extracting the start signal into a short pulse 21 corresponding to the instant of the origin of the coordinates of the transducer 1.

The starting point of the reference signal 22 is taken as the moment of transition of the signal of the additional 5 converter 4 movement through zero.

To eliminate spurious signals 23 of origin, key 7 at the output of block 5, the signal of origin of the signal of reference is normally closed and opens only according to the enable signal of control unit 8 in working area 24.

To generate a resolution signal, the total signal 20 of an additional compression generator 4 after amplification is fed to the input of the comparator 11 and through the inverter 10 to the input of the comparator 12, to the second inputs of which a reference voltage 18 is applied that exceeds the value of the interference 19. Outside the working area 24, the signals at the input of the comparators

0 is less than the reference voltage and, therefore, at the output of the comparators 11 and 12 and the element OR 16, the signal is zero and, thus, at the control input of the key 7, the signal is zero. The output of the discriminator is blocked on the common bus, and the signal at the output of the block 5 of the origin of the signal of reference is zero.

When moving forward, the signal of movement + S of block 3 is fed to the input of element And 14. When approaching the working zone 24

0 the positive half-wave of the sum signal of the converter 4 arrives at the input of block 5 of the origin of the reference signal. At the moment of equality of the input signal of block 5 and the reference voltage of source 1 at the input of the comparator 12, a signal 25 is output. The output signal of the comparator 11 is zero at this moment how inverter 10 will change the sign of the input signal. The output signal of the comparator 12 switches the trigger 13, so that at the first output a signal 26 appears at the input of the element AND 14. At the output of this element, the signal 27, which through the element OR 16 enters the input of the key 7, opens it also unblocks the discriminator output. With further movement, the signal of origin in the form of a short pulse 21 at point 22 will arrive at the output of the unit 5 for separating the signal of reference. The enable signal 27 (work zone) lasts until the half-wave of the total is negative

0 of the signal from the converter 4 through the inverter 10 is fed to the input of the comparator 11 and will cause the appearance of a signal at its output. This will occur when the signal from converter 4 is compared with the signal from source 17. The signal of comparator 12 is sent to the second input b

5 flip-flop 13 and switch it, after which the enabling signal at the input of the key 7 will disappear and the discriminator's output will again be blocked on the common bus. Comparator signal

12 enters the second input of the trigger b and switches it.

When reverse, when the movement signal is fed to the input of element 15, the beginning of the signal is the working area of the moment when the negative half wave of the converter 4 signal reaches the value of the reference signal of the comparator 11, after which the trigger 13 is switched by that its signal goes to the input of element 14 and output of the element OR 16, according to the Wits, the enabling signal, which will open the key 7. The enabling signal ends when the working zone reaches the moment when the positive half-wave of the converter 4 signal arrives at the input of the comparator 12 and will trigger it.

Claims (2)

1. An apparatus for generating a reference pulse in displacement meters, comprising a series-connected displacement transducer, a measurement pulse generation unit and a displacement direction determining unit, an additional displacement transducer consisting of two signal receivers and kinematically connected with the transducer, and the reference pulse extraction unit associated with the additional transducer and displacement direction detection unit, due to the fact that 0 five increase the accuracy, the receivers of signals from the additional converter are connected in a differential circuit, the block for determining the direction of movement is made with two outputs, and the block for selecting the start pulse is made in the form of a discriminator, a control key connected between the output of the discriminator and the common bus, a control block key connected between the control input of the controlled key and the first input of the discriminator, the first input of the discriminator connected with the output of the additional converter, logically the key control unit inputs coupled to the outputs determining the direction of movement, the second input of the discriminator is connected to the common bus, and the discriminator output is the output device. 2. The device according to claim 1, characterized in that the key control unit is in the form of an inverter, two comparators, a trigger with two inputs, two AND elements, an OR element and a reference voltage source, the input of the first comparator is connected to the input of the block, the second input the comparator is connected to the input of the block through an inverter, the outputs of the comparators are connected to different trigger inputs, the outputs of which are connected to the first inputs of the AND elements, the outputs of which are connected to the inputs of the OR element, the output Q of which is the output of the block and s are logic block inputs. 0 five AT. f-ie, 2  Out - $ Signal converter Discriminator signal Sizna / t comparator 10 Comparator signal 11 Trigger signal 15 Signal / i element 16 AND / 1 And Start signal FIG. five