The OD value in the filter
OD is when light passes through a sample, part of the light will be absorbed. In spectroscopy, transmittance is the ratio of the intensity of the emitted light to the incident light.
OD is the abbreviation of optical density, which indicates the optical density absorbed by the tested object. It is a proper term in the detection method. The detection unit is expressed by OD value, OD = LG (1 / trans), where Trans is the transmittance value of the tested object. Therefore, it is also called transmittance.
OD* indicates cutoff. According to OD1~OD6, the transmittance of cutoff band ranges from 0.1 to 0.000001
OD number cutoff band transmittance
OD1 = 0.1, i.e. 10%
OD2 = 0.01, i.e. 1%
OD3 = 0.001, i.e. 0.1%
OD4 = 0.0001, i.e. 0.01%
OD5 = 0.00001, i.e. 0.001%
OD6 = 0.000001, i.e. 0.0001%
Cut off number cut-off band
A 400~1100nm
B 300~1200nm
C 200~2000nm
D 400~700nm
E 400~800nm
F 400~1000nm
G 300~900nm
H 500~1000nm
I 800~1000nm
J 700~1200nm
K 200~1100nm
L 200~1200nm
M 200~1400nm
N 400~1200nm
O 200~1150nm
P 200~800nm
Q 350~700nm
U 200~700nm
V 300~950nm
W 200~1000nm
X 200~750nm
For example:
Od3-A: the cut-off range is 400 ~ 1100nm, and the transmittance of light wave is 0.001, except for the band with 1 / 2 bandwidth on both sides of the central wavelength
Od3-B: the cut-off range is 300 ~ 1200nm, and the transmittance of light wave is 0.001, except for the band with 1 / 2 bandwidth on both sides of the central wavelength
Od3-C: the cut-off range is 200 ~ 2000Nm, and the transmittance of light wave is 0.001, except for the band with 1 / 2 bandwidth on both sides of the central wavelength
Od3-D: the cut-off range is 400 ~ 700nm, and the transmittance of light wave is 0.001, except for the band with 1 / 2 bandwidth on both sides of the central wavelength
Od3-K: the cut-off range is 200 ~ 1100nm, and the transmittance of light wave is 0.001, except for the band with 1 / 2 bandwidth on both sides of the central wavelength
Od4-A: the cut-off range is 400 ~ 1100nm, and the transmittance of light wave is 0.0001, except for the band with 1 / 2 bandwidth on both sides of the central wavelength
OD4-B: The optical transmittance in the wavelength range of 300-0001 nm on both sides, except for the wavelength range of od2-0001.0 nm on both sides
Od4-B: the cut-off range is 200 ~ 2000Nm, and the transmittance of light wave is 0.0001, except for the band with 1 / 2 bandwidth on both sides of the central wavelength
Od4-D: the cut-off range is 400 ~ 700nm, and the transmittance of light wave is 0.0001, except for the band with 1 / 2 bandwidth on both sides of the central wavelength
Od4-K: the cut-off range is 200 ~ 1100nm, and the transmittance of light wave is 0.0001, except for the band with 1 / 2 bandwidth on both sides of the central wavelength
