SU1396056A1 - Apparatus for monitoring linear density of fibrous material - Google Patents

Abstract

The invention relates to the textile industry. The purpose of the invention is to improve the control accuracy by stabilizing the spectral composition of the radiation. The clock generator 12 OSbf / fm f (and the trigger trigger 13 turns on the power supply unit 2 of the light source 1. Light transmitted through the measurement object (fibrous material) is sensed by the photodetector 4. At the output of the amplifier 5, the signal is proportional to the linear density of the material. Signal from the output of amplifier 5 passes through the inverting unit 6 and enters the input of a pulse-width modulator connected to the input of power supply unit 2. Due to this, the average illumination of the photodetector is always constant, regardless of the linear density of a mobile product at a constant intensity of radiation from the source of light 1. 1 or. (L bur. Oi About

Description

The invention relates to the textile industry.

The purpose of the invention is to improve the accuracy of control by stabilizing the spectral composition of the slurry.

The drawing shows a block diagram of the proposed device.

A device for controlling the density of fiber material with a co-de; source of light 1 is connected to (output of power supply unit 2, lens 3.1 photodetector 4, the output of which is the amplifier 5 is connected to the input of the inverting unit 6. Amplifier output- TeinH 5 is an output of the device and may be associated with an indicator input (not shown).

The pulse width modulator (HiiM) consists of an analog-digital converter 7, a generator of 8 vertical pulses, a counter 9 of a pulse-C0B, an element 10, a delay line 11, a clock generator 12, and RS-mp of the igger 13. Inverter outputs

BTU 6, generator 12, and element I through a converter 7 are connected to one input of an element 10 and 10, another VXSOD of which is connected to the input of counter 9. The installation, counting, and reset inputs of counter 9 are connected to the outputs of the lines 1 Zader: ky generator 8 and element 10. And output of element 10 and generator 12 trigger 13 Conn: —inly from the input of the power supply unit 2 and the delay line 11.

The device works as follows.

On a pulse from the output of the generator 12, the trigger 13 is set to a single state and the power supply unit 2 supplies the voltage to the light source4. The passed measurement object (bulky material) is perceived by the photodetector 4, and its electric signal is amplified by an amplifier.

5 and arrives at the inverting unit 6, which generates a signal that, the more the input and vice versa. Next, the analog signal from the block

6 is converted to a digital code by a converter 7 triggered by a pulse.

from generator 12. A digital code is fed to the input of an AND 10 element, to another input of which a current code is fed from counter 9 running on the front of the pulse of delay line 11. The counter 9 at the same time sums the pulses from the output of the generator B. When the code of the converter 7 and the counter 9 coincides, the element And 10 generates a positive pulse, which resets the trigger 13, the counter 9 and the converter 7 to the zero position. At the same time, the power supply unit 2 stops supplying the voltage to the light source 1 and the light pulse ends. As a result of the operation of the device, as the amplitude of the light pulse perceived by the photoreceiver 4 increases, its duration is proportionally reduced and vice versa. The average illuminance of the photodetector is kept constant regardless of the linear density of the material being monitored. The role of the delay line 11 is to eliminate the false triggering of the element 10 because the counter 9 starts operation earlier than the converter 7 finishes converting the analog signal to digital.

Claims (1)

Formula from the range A device for monitoring the linear density of a fibrous material containing a power supply unit connected to an input of a light source and arranged successively in the direction of the optical axis of the light source an objective lens and a photoreceiver, whose output is connected to the indicator input, and a luminous flux regulator that, in order to increase the control accuracy by stabilizing the spectral composition of the radiation, it is equipped with an inverting unit, and the luminous flux regulator is made in the form of a pulse-width modulus and, the output of the photodetector through an inverting unit coupled to the input of the pulse-pulsed modulator output coupled to the input of the power unit. VNIIPI Order 2490/46 Circulation 847 Man-made games. pr - tie, Uzhgorod, st. Project, 4 Subscription