OPTICAL MEASUREMENT SENSOR AND A METHOD FOR EVALUATING A PHYSICAL MAGNITUDE

摘要

The measurement sensor (2) according to the invention comprises means for transmitting an electromagnetic measurement signal (24, 23a), means for scattering the transmitted electromagnetic signal (21, 21 a), means for receiving a scattered electromagnetic measurement signal (24, 23b) and eventually means for evaluating the value of a physical variable to be measured from the received electromagnetic measurement signal. The means for scattering the electromagnetic signal comprise a measurement bar (21, 31 ) fastened only from its first end, the second end (21a) of which measurement bar is arranged to scatter the electromagnetic measurement signal, the received measurement value of which is proportional to the flexure (f) produced to the measurement bar due to the variable to be measured, and the value of the physical variable to be measured is arranged to be evaluated from the instantaneous flexure experienced by the measurement bar. The measurement sensor according to the invention can be utilized for example in the assay methods for acceleration, vibration, moisture, contact, deflection, magnetic properties and viscosity.