To provide a physical quantity measuring device capable of improving assembleability or space saving by simplifying a wiring state.
This physical quantity measuring device 10 is used for measuring a plurality of physical quantities showing a state inside a fuel tank 20. The physical quantity measuring device 10 includes an optical fiber 16 having a plurality of FBGs (Fiber Bragg Grating) 1-5 reflecting light having a different wavelength relative to each physical quantity to be measured. Incident light input into the optical fiber 16 passes an optical circulator 18, and is guided to each sensor 11-15 in the fuel tank 20. The incident light is reflected partially by each FBG 1-5 provided on a portion passing each sensor 11-15. Reflected light is guided to a signal processing part 17 by the optical circulator 18, and processed for each reflected light of FBGs 1-5.
YOSHIKAWA KOJI
KINO HISASHI
Next Patent: SENSOR CIRCUIT AND SENSOR NODE