METHOD OF MEASURING THERMOMECHANICAL ACTION Russian patent published in 2025 - IPC G01B11/16 G01L1/16 

FIELD: measuring equipment.

SUBSTANCE: disclosed is a method for measuring thermomechanical action, in which an indicator coating is used as a "coating/sensor" system in the form of a polymer layer with a fibre-optic sensor integrated in the form of a spiral, controlling the intensity of the light flux at the output of the optical fibre by changing the control parameter at the output of the optical fibre, measurement of the thermomechanical effect is carried out by the measured intensity of the light flux at the output of the optical fibre as a function of the control parameter, spectrum of multiple distributed thermomechanical action on the surface of the indicator coating is found from the successive solution of two Fredholm integral equations of 1st kind. According to the invention, a mechanophotoluminescent (MPhL) optical fibre sensor is used in the form of an optical fibre doped with encapsulated fluoroform shells and mechanoluminescent particles, and a control parameter in the form of intensity of the control light flux entering the optical fibre with a frequency spectrum of light output of the mechanoluminescent particles. Measurements of thermomechanical action are carried out based on results of measurement at the output of the optical fibre of intensity of informative light flux with a frequency spectrum ofphotoluminescence of fluoroform shells of encapsulated particles. Location and value of a single concentrated thermomechanical effect on the indicator coating are found from the measured quantity, intensity values and values of time intervals between light pulses of the informative light flux at the output of the optical fibre. Spectrum of multiple distributed thermomechanical action on indicator coating is found from successive solution of two Fredholm integral equations of 1st kind, in which the left-hand side of the first equation is a function of the intensity of the informative light flux from the control parameter, and the left-hand side of the second equation is the solution of the first equation in the form of a spectrum of pressure distribution along the length of the optical fibre.

EFFECT: high sensitivity and accuracy of measurement, wider field of use of the method of measuring thermomechanical action.

2 cl, 3 dwg