DEVICE DETERMINING COEFFICIENT OF THERMAL DIFFUSIVITY Russian patent published in 1997 - IPC

FIELD: measurement of thermophysical characteristics of solid materials, thermal nondestructive testing. SUBSTANCE: pulse source 1 of heating is optically coupled to register 18 of heating pulses and tested sample 2, temperature of back surface of which is measured by temperature transducer 3. Output of this transducer 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 heating pulses is connected to input of second key 17. Controlling input of second key 17 and first input of third coincidence circuit 11 are connected to second input 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 coupled to input of second differentiator 5. Output of second differentiator 5 is connected to null detector 6. Output of null detector 6 is linked to R input of RS flip- flop 7 and 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 third 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 linked to second information input of reversible counter 12. Outputs of second coincidence circuit 10 is connected to controlling input of reversible counter 12. Output of reversible counter 12 is linked to input of digital indicator 13. Input of setting of initial state of reversible counter 12, S input of RS flip-flop 7, inputs of pulse generator 8 and pulse source 1 of heating are connected to start terminal 19. EFFECT: enhanced operational efficiency and reliability. 2 cl, 2 dwg