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types of glass>Band-pass Filter Glass
Band-pass
Filter Glass
Band-pass
Filter Glass, band-pass filter for short, is a kind of glass
allowing the transmission of light within a narrow bandwidth
range, with an obvious cut-off effect to short wave and long
wave, as shown in the figure. Its spectral characteristic is
illustrated by the maximum transmittance (TM) and the wavelength
at the peak (λM), front-cut-off wavelength and behind-cut-off
wavelength, and half-peak width.
Half-peak width is the difference (λ2-λ1) nm between
λ1 and λ2 that are corresponding to the half values
of TM of the band-pass filter glass. The front-cut-off or behind-cut-off
wavelength is the wavelength corresponding to the transmittance
of zero on either side of the peak. But there are some types
whose transmittance on the back side of the peak can not approach
to zero. So they are determined by the transmittance of a certain
wavelength. Band-pass filter glass is named DTB in this catalogue,
and the wavelength corresponding to TM is used as its serial
number.
Band-pass
Filter Glass characteristics
NO.
Type
Maximum
Transmissivity
(TM/λMnm)
Front
Cut-off
(T/λnm)
Behind
cut-off
(T/λnm)
Half-peak
Width
(λ2-λ1)(nm)
Thickness
(mm)
1
DBT400
>=45/400±2
0/320±5
0/525±5
<=90
2
2
DBT435
>=48/435±2
0/340±5
<=2.0/540±5
<=100
4
3
DBT470
>=40/470±2
0/340±5
0/600±5
<=115
4
4
DBT500
>=48/500±2
0/380±5
0/630±5
<=100
4
5
DBT530
>=48/530±2
0/420±5
0/670±5
<=95
2
6
DBT545
>=48/545±2
0/400±5
0/720±5
<=100
4
7
DBT560
>=40/560±2
0/435±5
0/725±5
<=104
4
8
DBT600
>=36/600±2
0/470±5
<=1.0/800±5
<=95
4
9
DBT660
>=44/660±2
0/500±5
<=2.0/800±5
<=115
4
10
DBT700
>=28/700±2
<=0.5/570±5
<=2.0/820±5
<=95
4
11
DBT720
>=50/720±2
0/500±5
<=9.0/900±5
<=140
4
12
DBT740
>=25/740±2
0/650±5
<=4.0/900±5
<=85
4
The
spectrogram of Band-pass Filter Glass
ADD
: The 31th group, Liuwei village, Shuanglou Industrial park, Qutang
town, Haian county, Jiangsu, china
