SU1597605A1 - Apparatus for converting temperature of revolving objects to electric signal - Google Patents

Abstract

The invention relates to a measurement technique and makes it possible to improve the accuracy of temperature measurement, as well as to provide the possibility of measuring the speed of rotation of a part. When the half rings of rotating capacitors 2 and 3 on the rotating object are located in the opposite side from the half rings on the stationary part, the voltage at the output of the amplifier 4, to the input of which through the resistor 5 is connected the reference voltage source 10, does not depend on the resistance of the thermal converter (TC) 1 mounted on a rotating object. At the moment the semi-rings of the rotating capacitors enter into engagement, the signal at the output of amplifier 4 is proportional to the resistance value of TC 1. The subtraction unit together with the amplitude detector 7 generates a signal proportional to the change in resistance of the TC 1, which is stored in the amplitude detector 9. The signal at the output of the subtraction unit 8 changes with the frequency of rotation of the part. 1 il.

Description

The invention relates to a measuring technique, in particular, to devices for measuring the temperature and speed of rotating objects of various mechanisms and aggregates.

The purpose of the invention is to increase the measurement accuracy, as well as to ensure the possibility of measuring the speed of rotation of objects and simplifying the device

The drawing shows a diagram of the proposed device.

The device contains resistor thermocouple 1 located on a rotating object, first 2 and second 3 rotating capacitors, fixedly placed amplifier 4 first resistor 5 with resistance R-, second resistor 6 with resistance Rg, first amplitude detector 7, block 8 subtraction, second amplitude detector 9 and the reference source 10 is the voltage

I Rotating capacitors 2 and 3 are made in the form of half-rings located on a rotating object, and are stationary. When rotating, their capacitance changes from the maximum value D ° to the minimum value

 min ,,

The device works as follows, ..

At the moment when the semi-rings of rotating capacitors are rotating. Since the object is located on the opposite side of the half-rings on the stationary part, the load on you during the booster has the form

P - TT --- t

VK) (, R

where U | j is the voltage at the output of the source 10 of the reference voltage} Rj and R, respectively

Resistance 5 and 6,. and is memorized in the amplitude detector 7. In this case, the signal at the output of the subtraction unit 8 is equal to zero, since the same signals are received at its inputs

- With further rotation, the semi-rings of rotating capacitors are placed one against the other, their capacity increases to the maximum value,

At the moment of entering the half-rings into the target, the signal at the output of the amplifier 4 can be determined from the expression

Ue., X,. (P) and „, K (P),

Z (P) where K (P) p is the transfer coefficient of the amplifier 4 in

operator form;

Z (P) is the operator resistance of a circuit made up of parallel-connected resistors 6 and a series circuit of capacitances of rotating capacitors 2 and 3 and thermal converter 1 of resistance in

The resistance of the resistor 6 must be much greater than the resistance of the thermal converter I resistance. In this case, the maximum amplitude of the output signal of the operational amplifier 4 is determined by the expression

UB .-. (T) - and, „

. -Lj

where R (T) is the resistance of the thermocouple 1,

The output of block 8 subtraction voltage for this point in time is

35

G .n (- | t

Jill

R

45

d

0

and will be fixed in the second amplitude detector 9,,

Thus, the output voltage of the amplitude detector 9 is directly proportional to the temperature of the object, and the frequency of voltage measurements at the output of the subtraction unit is proportional to the speed of rotation of the object.

Claims (1)

Invention Formula A device for converting the temperature of spinning objects into an electrical signal containing a thermal resistor transducer located on the object is connected via capacitors to the input and output of a stationary amplifier, a subtraction unit, which, in order to increase the measurement accuracy, two amplitude detector, two resistors and a reference voltage source, per515976056 Its output terminal is connected to the common detector to the inputs of the unit's output unit, and the second output terminal, whose output is connected to the second amplitude detector, the amplifier input, between the input and output of the capacitor plate, the output of which is connected to the second resistor filled in the form of two half-rings, a dispenser, and the output of the urniliter are connected not placed on a rotating- and directly through the first amppi-ing and stationary parts of the object.