8nm, 10nm, 20nm, 30nm, 40nm, 60nm
Tave>85% @ 650nm
customized, from 2x2mm to Dia. 110mm, +/-0.1mm
>90%, or full surface coatings
B270, BK7, crystal, float or sodalime glass etc.
An ideal bandpass filter would have a completely flat passband
(e.g. with no gain/attenuation throughout) and would completely
attenuate all frequencies outside the passband. Additionally, the
transition out of the passband would have brickwall
In practice, no bandpass filter is ideal. The filter does not
attenuate all frequencies outside the desired frequency range
completely; in particular, there is a region just outside the
intended passband where frequencies are attenuated, but not
rejected. This is known as the filter roll-off, and it is usually
expressed in dB of attenuation per octave or decade of frequency.
Generally, the design of a filter seeks to make the roll-off as
narrow as possible, thus allowing the filter to perform as close as
possible to its intended design. Often, this is achieved at the
expense of pass-band or stop-band ripple.
The bandwidth of the filter is simply the difference between the
upper and lower cutoff frequencies. The shape factor is the ratio
of bandwidths measured using two different attenuation values to
determine the cutoff frequency, e.g., a shape factor of 2:1 at 30/3
dB means the bandwidth measured between frequencies at 30 dB
attenuation is twice that measured between frequencies at 3 dB
Optical band-pass filters are common in photography and theatre
lighting work. These filters take the form of a transparent
coloured film or sheet.
fluorescence analyser,Cell phone barcode scanning,Infrared
Camera,iris recognition and so on.
1.Factory direct sale.
2. Fast, accurate quotes.
3. Reply you within 24 working hours.
4. Customized design is avaliable.
5. OEM is welcome.
6. Speed and precious delivery.
7. Supply several pieces free samples, but buyers bear the delivery
charge. Some expensive samples, Samples cost could be necessary.
8. Delivery time depends on the size of the order and the items.
Please feel free to contact me if you have any questions, we will
reply you asap.
We sincerely hope we can establish long term cooperation
relationship with you , and do our best to create
our bright and prosperous future.