TEMPERATURE MEASURING INSTRUMENT FOR THREE-DIMENSIONAL DEVICES, TEMPERATURE MEASURING INSTRUMENT FOR COMBUSTION ENGINES, AND TEMPERATURE MEASURING METHOD FOR COMBUSTION ENGINES AND THREE-DIMENSIONAL DEVICES

摘要

PROBLEM TO BE SOLVED: To provide a temperature measuring instrument for three-dimensional devices and the like that can measure temperatures less expensively with higher precision than by the prior art in limited areas of internal spaces of three-dimensional devices, such as in engine cylinders, with the result that temperatures in three-dimensional devices can be measured less expensively with higher precision.SOLUTION: Different kinds of gas components Gi are supplied to each of measurable sub-areas Rmi set within a measurable area Rm, terahertz waves Te of multiple wavelengths within the frequency range of 0.01 THz to 10 THz are transmitted toward an internal space R of a three-dimensional device and terahertz waves Te of multiple wavelengths having passed the measurable area Rm are received to detect the intensity of the terahertz waves Te of multiple wavelengths. The variation quantity of this intensity of the terahertz waves Te of multiple wavelengths is compared with the variation characteristics of each wavelength of the terahertz waves in each of preset multiple gas components Gi to calculate the temperatures Tmi of the measurable sub-areas Rmi.SELECTED DRAWING: Figure 1