SU1296861A1 - Device for contactless checking of temperature - Google Patents

Abstract

The invention relates to a measurement technique and makes it possible to increase the accuracy of temperature control by eliminating the influence of the radial beating of a rotating object. The luminous flux from the object of control enters the photoresistor 3. At the information input of the switching unit 7, a voltage depending on the temperature of the object coitrol $ is set. The voltage at the output of the photoresistor 2 is proportional to the brightness of the source 1 of the reference radiation and corresponds to certain calibration values of temperature. When pulses appear at the output of differentiating unit 6, switch 7 passes the information signal, which then arrives at the input of storage unit 8, the signal at the output of the latter is held until a new value of the information signal arrives. The output signal (differentiating unit 6 is fed to the input of the comparison circuit 9, the second input of which receives a signal from the output of the photoresistor 2. When the voltage across the inputs of the comparison circuit 9 coincides, the voltage detected by the indicator 10 by the absence of a signal indicates a deviation temperature from the set. 1 Il. (L

Description

1129686

The invention relates to a measuring technique and can be used in various fields of engineering, in particular in nuclear and boiler plants, to control the temperature in various technological processes, for example, in welding and quenching.

pipes with heating currents of high frequency.

The purpose of the invention is to improve the accuracy of temperature control by eliminating the influence of the radial beating of a rotating object.

The drawing shows a block diagram of the proposed device.

The device contains a source of reference radiation I, consisting of a current stabilizer made on

temperature In this case, as a result of the beating of the control object, the voltage at the information input of the switching unit changes. At the same time, the beating sensor 5 is illuminated by the luminous flux of the test object, and the first photoresistor 2 is illuminated by the source I, the standard of 15 radiation. The voltage at the output of the first photoresistor 2 is proportional to the brightness of the source 1 of the reference radiation and corresponds to the determined calibration values of the 140UD1 circuit and the miniature incandescent bulb of the type CMN-6,3, optic-20. The signal from the output of the sensor 5 is connected to the working surface of the beats at the input by the differential of the first of the two photoresistors 2, 3 of the radiation converter A, which is a differential photoresistor of the FSK-7B type, at a voltage of 25 mA at the output Dedicated to two photoresistors, 5 beats are made, which coincide in time on a single substrate (not shown ana),

arms of block 6,. The voltage pulses at the output of the differentiating block 6 correspond to the maximum and minini, respectively, with the maximum and minimum removal of the test object from the beating sensor 5. The points of maximum and minimum distances from the sensor 5 of the beats correspond to the same distance from the test object to the working surface of the second photoresistor 3. When pulses appear

The beat sensor 5 is a functional converter of the magnitude of the light into an electrical signal. When this normal to the working surface of the photoresistor 3 and the normal to the working surface of the sensor 5, the beating forms an angle of 90

nor, respectively, with the maximum and minimum removal of the control object from the sensor 5 beats. The points of maximum and minimum distances from the sensor 5 of the beats correspond to the same distance from the test object to the working surface of the second photoresistor 3. When pulses appear

Output

The beat sensor 5 is differentiated at the output of the differentiating unit 6, the connecting unit 6 is connected to the control unit. the control input of the switching unit, the input of the switching unit 7, representation 7, the latter passes the information signal of the arrivals then to the input of the storage node 8. The signal to

For example, an analog switch of the 190 series, the information input of which is connected to the second photoresistor 3, and the output to the input of the storage node 8. The outputs of the storage node 8 and the first photoresistor 2 are connected respectively to the first and second inputs of the comparison circuit 9, the output of which connected to the indicator 10. The beat-out sensor 5 is also made on a photo-resistor FSK-7B, the differential input of which receives a signal from the first photoresistor you 2. When the voltage drops across both inputs

dumb block 6 is made on the chip

572, 155, 561 series, block 7 switching voltage registered on the 190 series microcircuit, recording „„ „„ „„ „„ „„ „„ „„ „„ „„ the missing unit 8 is mounted on a capacitor with film dielectric and 140UD8 microcircuit, comparison circuit 9, also on 140UD8 microcircuit. The SMN-6,3 lamp with a current pick-up is used as the indicator 10.

The device works as follows.

cxeNM 9 comparison at its output by

indicator 10. The absence of a signal on the indicator 10 indicates the deviation of the temperature from the set

Claims (2)

1. The device rtsl contactless temperature control, containing and The luminous flux from the control object falls on the second photoresistor 3, changing its resistance. At the information input of the switching unit 7, a voltage is set, the value of which depends on the brightness of the control object, and, consequently, on its temperature In this case, as a result of the beating of the control object, the voltage at the information input of the switching unit changes. At the same time, the beating sensor 5 is illuminated by the luminous flux of the test object, and the first photoresistor 2 is illuminated by the source I of the reference radiation. The voltage at the output of the first photoresistor 2 is proportional to the brightness of the source 1 of the reference radiation and corresponds to the determined calibration values of the temperature. The signal from the output of the sensor 5 beats is fed to the input of the differential voltage at the output of the sensor 5 beats, which coincide in time perature. The signal from the output of the sensor 5 beats is fed to the input of the differential voltage at the output of the sensor 5 beats, which coincide in time arms of block 6,. The voltage pulses at the output of the differentiating block 6 correspond to the maximum and mini-temperature. The signal from the output of the sensor 5 beats is fed to the input of the differential voltage at the output of the sensor 5 beats, which coincide in time nor, respectively, with the maximum and minimum removal of the control object from the sensor 5 beats. The points of maximum and minimum distances from the sensor 5 of the beats correspond to the same distance from the test object to the working surface of the second photoresistor 3. When pulses appear on zykhod differentiating block 6,. control input of the switch on zykhod differentiating block 6,. control input of the switch 7, the latter passes the information signal of the arrivals then to the input of the storage node 8. The signal to output of the storage node 8 is held until a new value of the information signal is received when the next pulse arrives at the output of the differentiating unit 6 And is applied to the input of the comparison circuit 9, on the second the input of which receives a signal from the output of the first photoresistor 2. If the voltage drops at both inputs  voltage recorded by „„ „„, „„ „„, p. ™ „„ „„ „.„ cxENM 9 Comparison at its output across a voltage recorded by „„ „„, „„ „„, p. ™ „.„ „„. „„ indicator 10. The absence of a signal on the indicator 10 indicates the deviation of temperature from the set. Invention Formula 1. Device rtsl non-contact temperature control, containing is312968614 a reference radiation point, two by the focal input of the switching resistor control unit, the comparison circuit, the single input of which is connected to the output of which is connected to the first photo-stroke of the differentiating unit; and a cutter, and the output is connected to the indium move of the memory node is connected to which, the second input of the comparison, with that, in order to increase the accuracy of the cont-normal to the working surface By eliminating the influence of the radiation of the second photoresistor and the normal to the beating of rotating objects, the angle of 90 is sequentially connected to the blunt surface of the beat sensor. beat sensors and differential 2. The device according to claim 1, about tl and a curing unit, as well as consistent with the fact that the sensor is connected with a switchboard unit made in the form of a functional memorization unit, with the second value converter illuminated by a photoresistor connected with information into an electrical signal.