초록 ▼

A fiber optical temperature measuring apparatus is based on the ability of certain materials to change color in dependence on changes in temperature. Visible or invisible light having at least two different wavelengths is supplied to the material and the light emanating from the material is detected

A fiber optical temperature measuring apparatus is based on the ability of certain materials to change color in dependence on changes in temperature. Visible or invisible light having at least two different wavelengths is supplied to the material and the light emanating from the material is detected for determining the changes in the absorption characteristic of the material at the emitted wavelengths by determining the quotient between the detected signals from the material.

대표청구항 ▼

Temperature measuring apparatus, comprising: material forming a sensor and including a coloring pigment having spectral absorption characteristics with a temperature-dependent transition from a high to a low absorption characteristic over a range of optical wavelengths, said material being subjected

Temperature measuring apparatus, comprising: material forming a sensor and including a coloring pigment having spectral absorption characteristics with a temperature-dependent transition from a high to a low absorption characteristic over a range of optical wavelengths, said material being subjected to the temperature to be measured; optical fibers for transmitting light at least at two wavelengths, with at least one of said wavelengths being within said range of optical wavelengths, to said temperature-dependent material and for transmitting light representative of said temperature-dependent transition at each of said at least two wavelengths from said material; means for optically sensing said transmitted light from said temperature-dependent material by said optical fibers and generating signals representative thereof; and means for determining temperature from said signals, and including means for comparing the optically sensed temperature transition signals of said at least two wavelength ranges to compensate for variable transmission characteristics in said optical fibers.