SU1402869A1 - Device for measuring surface tightness of nonwoven textile materials - Google Patents

Description

I1140

i The invention relates to a device for measuring the surface density of nonwoven textile materials (NTM) and is intended to work as a sensor in an NTM production line.

The purpose of the invention is to increase the measurement accuracy.

The drawing shows the proposed JQ common and marginal sections of the working

device. ; The device contains a source of 1 I red light, which includes a pulsed power supply unit associated with I LEDs 2. Along the course of the radiation: the LEDs 2 are located; 3 light compensators, for

which is the work area 4; and second compensators 5. Photodiodes 6 of a photodetector device are optically connected through compensators 3, a measuring platform and compensators 5 with corresponding LEDs 2. The outputs of photodiodes 6 are connected to the inputs of: synchronous detectors 7, the control j inputs of which are connected to the source 1. The output of one of synchronous detectors 7, the owner of the reference, is connected to the first input of circuit 8

20

25

area 4, which improves measurement accuracy. The signal from each photodiode 6 passes a corresponding synchronous detector 7, controlled by a pulsed power supply unit of source 1. The signals of the measuring channels, which are detected by switch 9, are connected in series to one of the inputs of the comparison circuit 8, and the signal of the reference channel arrives at its other input which is similar to the measuring channels. Circuit 8 compares the signal proportional to the deviation of the surface density of the material from the nominal value.

The use of the proposed device (as opposed to the known) improves the accuracy and reliability of measurements of the surface density of non-woven textile materials.

Nin and 9 EXITS of the remaining synchronous

The detectors 7 are connected to the inputs of the switch 9, the extr of which is connected to the second input of the comparison circuit 8.

The device works as follows.

From the output of the pulse power supply unit of the source. 1, the current pulses arrive at the LEDs 2. At the same time, by synchronously turning on the LEDs 2, the synchronism of their pulses is achieved. Next, the radiation pulses of the LEDs 2 distributed in a certain solid angle pass through the compensators 3. In this case, due to the fact that each compensator 3 was exposed to the corresponding level, a diode 2 in the linear region of the characteristic curve and is shown at a contrast ratio equal to one. , the transmittance of the compensator 3 at each of its points is inversely proportional to the intensity of the radiation incident on the compensator. Thus, after passing through the compensators 3, the radiation intensities of the LEDs 2 are aligned, whereby the illumination of the working area 4 is uniform and equal in all channels. Pass through the material under study

The rial, located in working area 4, is received by photodiodes 6. Due to the fact that compensators 5 are made in the form of direct circular optical cones with a maximum optical density in the center, the contributions made to the common photodiode signal by the rays Q are achieved. Rural and marginal sections of the working

five

0

five

0

five

0

five

five

0

area 4, which increases the measurement accuracy. The signal of each of the photodiodes 6 passes through a corresponding synchronous detector 7, controlled by a pulsed power supply unit of source 1. The signals of the measuring channels, detected by switch 9, are connected in series to one of the inputs of the comparison circuit 8, whose structure is similar to the measuring channels. Circuit 8 compares the signal proportional to the deviation of the surface density of the material from the nominal value.

The use of the proposed device (as opposed to the known ones) improves the accuracy and reliability of measurements of the surface density of nonwoven textile materials.

Claims (1)

Invention Formula A device for measuring the surface density of nonwoven textiles containing an infrared radiation source optically coagulated through the work area with a photoreceiver connected to a signal processing circuit, characterized in that, in order to increase the measurement accuracy, the infrared radiation source consists of as two LEDs, the device additionally introduced two groups of luminance compensators according to the number of LEDs, while the first group of compensators is located at x the radiation between the LEDs and the area, and the second group between the working area and the photoreceiver, made as a set of photodiodes by the number of LEDs, so that each LED through the compensator is optically connected to the corresponding photodiode photosensitive material pre-exposed to radiation corresponding to 314028694 the linear LED in the linear region, and the compensators of the second portion of the characteristic curve of the group are made in the form of direct round blackening of this photographic material and linear optical cones.