Optical sensors can be divided according to the type of optical properties used for measurement:
a. Adsorption, measured in a transparent medium, is due to the adsorption of the analyte itself or the reaction with some suitable indicators
b. Reflection is measured in opaque environments, usually stabilized using an indicator
c. Luminescence, based on the measurement of the intensity of light emitted by a chemical reaction in the receptor system
d. Fluorescence is measured as the positive emission effect of radiation. Also, selective fluorescence quenching may be the basis of such devices
e. The refractive index is measured as a result of a change in the composition of the solution. This may also include the effect of surface plasmon resonance (SPR)
f. Exothermic effect, based on the measurement of the thermal effect of light absorption
g. Light scattering, based on the effects of particles of a certain size in the sample [142]
Optical sensors can
be divided
according to the type of optical properties
used
for measurement:
a. Adsorption,
measured
in a transparent medium, is due to the adsorption of the analyte itself or the reaction with
some
suitable indicators
b. Reflection is
measured
in opaque environments,
usually
stabilized using an indicator
c. Luminescence, based on the measurement of the intensity of light emitted by a chemical reaction in the receptor system
d. Fluorescence is
measured
as the
positive
emission
effect
of radiation.
Also
, selective fluorescence quenching may be the basis of such devices
e. The refractive index is
measured
as a result
of a
change
in the composition of the solution. This may
also
include the
effect
of surface plasmon resonance (SPR)
f. Exothermic
effect
, based on the measurement of the thermal
effect
of light absorption
g. Light scattering, based on the effects of particles of a certain size in the sample [142]