using extension or expansion of solids or fluids

Introduced: September 1968

Full Title

Radiation pyrometry, e.g. infrared or optical thermometry > using extension or expansion of solids or fluids

IPC and CPC are identically structured here. All 3 subcodes exist in both systems.

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G01J 5/40 using bimaterial elements IPC+CPC Available in IPC and CPC
G01J 5/42 using Golay cells +1 CPC IPC+CPC Available in IPC and CPC
G01J 5/44 using change of resonant frequency, e.g. of piezoelectric crystals IPC+CPC Available in IPC and CPC