RU94027253A - Device to determine coefficient of thermal diffusivity - Google Patents

Abstract

FIELD: measurement of thermophysical characteristics of solid materials, thermal non-destructive testing. SUBSTANCE: pulse heating source 1 is optically coupled to register 18 of heat pulses and examined sample 2 which rear surface temperature is measured by temperature-sensitive element 3. Output of temperature-sensitive element 3 is connected to input of first key 16. Controlling input of first key 16, first inputs of first 9 and second 10 coincidence circuits are connected to first output of RS flip-flop 7. Output of register 18 of heat pulses is linked to input of second key 17. Controlling input of second key 17 and first input of third coincidence circuit 11 are connected to second output of RS flip-flop 7. Outputs of first 16 and second 17 keys are connected to input of first differentiator 4. Output of first differentiator 4 is connected to input of second differentiator 5. Output of second differentiator 5 is connected to input of null detector 6. Output of null detector 6 is linked to R input of RS flip-flop 7 and to second input of second coincidence circuit 10. Second input of first coincidence circuit 9 is connected through second counter-frequency divider 15 to output of pulse generator 8. Second input of first coincidence circuit 11 is connected through first counter-frequency divider 14 to output of pulse generator 8. Output of first coincidence circuit 9 is connected to first information input of reversible counter 12. Output of third coincidence circuit 11 is connected to second information input of reversible counter 12. Output of second coincidence circuit 10 is connected to controlling input of reversible counter 12. Output of reversible counter 12 is connected to input of digital indicator 13. Input for setting of initial state of reversible counter 12, S input of flip-flop 7, inputs of pulse generator 8 and pulse heating source 1 are connected to start terminal 19. EFFECT: simplified design, increased accuracy of measurement are achieved thanks to use of one measurement channel and optimization of functioning algorithm. 1 cl, 1 dwg

Claims (1)

Usage: means of measuring the thermal characteristics of solid materials, thermal non-destructive testing. The pulse heating source 1 is optically coupled to a heat pulse recorder 18 and a test sample 2, the back surface temperature of which is measured by a temperature sensor 3. The output of the temperature sensor 3 is connected to the input of the first key 16. The control input of the first key is 16, the first inputs of the first 9 and second 10 circuits matches are connected to the first output of the RS flip-flop 7. The output of the heating pulse recorder 18 is connected to the input of the second key 17. The control input of the second key 17 and the first input of the third match circuit 11 are connected to the second output RS-flip-flop 7. The outputs of the first 16 and second 17 keys are connected to the input of the first differentiator 4. The output of the first differentiator 4 is connected to the input of the second differentiator 5. The output of the second differentiator 5 is connected to the input of null-organ 6. The output of null-organ 6 is connected to K the RS input of flip-flop 7 and the second input of the second matching circuit 10. The second input of the first matching circuit 9 through the second counter-frequency divider 15 is connected to the output of the pulse generator 8. The second input of the third matching circuit 11 through the first counter-frequency divider 14 is connected to the output ohm of the pulse generator 8. The output of the first matching circuit 9 is connected to the first information input of the reversing counter 12. The output of the third matching circuit 11 is connected to the second information input of the reversing counter 12. The output of the second matching circuit 10 is connected to the control input of the reversing counter 12. Output of the reversing counter 12 connected to the input of the digital indicator 13. The input of the installation of the initial state of the reverse counter 12, the S-input of the RS-trigger 7, the inputs of the pulse generator 8 and the pulse heating source 1 are connected to the trigger th terminal 19. Simplification of the device and increased measurement accuracy are achieved through the use of a single measuring channel and optimization of the functioning algorithm. 1 s P. f-ly, 1 ill.