Motic Instruments Inc. Canada
October 06, 2006
42
LP
Longpass Filters
Longpass filters transmit a wide spectral band of long wavelength radiation while blocking short
wavelength radiation.
(See Figure Below)
Narrowband Filters
Narrowband filters with a very narrow band, typically 1 to 3nm wide. They can be used
successfully only with high intensity light sources because of the narrow bandwidth.
ND
Neutral density filters are designed to reduce transmission evenly across a portion of the
spectrum.
OG
Orange Glass - Longpass absorption glass from Schott Glassworks with cut-on wavelengths in
the green, yellow and orange regions
PC
Polychromatic mirrors or beamsplitters.
These beamsplitters reflect and transmit more than two bands of light. Dual-band or Triple-band
filter sets includes three carefully balanced combinations that contain dual or triple bandpass
excitation and emission filters, these dedicated filter sets also incorporate polychromatic mirrors
or beamsplitters with multiple bandpass characteristics, having transmission and reflection
regions that are matching to the specific excitation and emission filters employed.
RG
Red Glass - Longpass absorption glass from Schott Glassworks with cut-on wavelengths in the
red and far red regions
SP
Shortpass Filters
Shortpass filters transmit a wide spectral band of short wavelength radiation and block long
wave radiation.
(See Figure Below)
S/N
Signal to Noise Ratio
Ratio of intensity of signal to that of the background.
Stokes shift
The distance between the peak absorption and emission of a dye, usually in nm.
