Vortex Optical Coatings 紅外濾光片涂層
Vortex Optical Coatings 紅外濾光片涂層
IR Filters and Coatings
We design and make a wide range of IR Filters from 0.7-6.0μm.
A range of Narrow Band Filters (for gas and chemical detection) and a range of general IR filters are available from our web-shop see below.
Custom filters can be manufactured with short lead-times, contact us through the link below today.
Stock Narrow Band Filters
We have a wide range of ‘off the shelf’ filters for detection of common gases and materials, these can be bought online now, see full details and specifications below.
Part NumberCWL (nm)TransmittanceFWHM (nm)Suggested?
NBP-1940-42-251940 nm (+/- 8nm)>85%42 nm (+/- 5nm)H2O (Water)
?NBP-3055-145-253055 nm (+/- 16nm)>75%145 nm (+/- 17nm)C2H2 (Acetylene)
NBP-3260-150-253260 nm (+/- 16nm)>75%150 nm (+/- 17nm)C2H4 (Ethylene)?
NBP-3330-150-253330 nm (+/- 15nm)>75%150 nm (+/- 15nm)CH4 (Methane)?
NBP-3349-70-253349 nm (+/- 15nm)>75%70 nm (+/- 15nm)C2H6?
NBP-3400-155-253400 nm (+/- 15nm)>75%155 nm (+/- 15nm)(HC) General HydRocarbon
NBP-3900-180-253900 nm (+/- 18nm)>75%180 nm (+/- 20nm)(Reference)
NBP-4000-180-254000 nm (+/- 18nm)>75%180 nm (+/- 15nm)(Reference)
NBP-4260-160-254260 nm (+/- 20nm)>70%160 nm (+/- 21nm)CO2 (Carbon Dioxide)
NBP-4530-85-254530 nm (+/- 20nm)>75%85 nm (+/- 10nm)N2O (Nitrous Oxide)
NBP-4660-165-254660 nm (+/- 15nm)>75%165 nm (+/- 15nm)CO (Carbon Monoxide)
NBP-5330-190-255330 nm (+/- 25nm)>65%190 nm (+/- 25nm)NO (Nitrogen Monoxide)
Part Numbers Explained
General?IR Filters and Coatings
We manufacture a range of IR filters for applications such as non-contact temperature measurement, filter wheels and machine vision, available online below.
Part NumberDescription
BPF-VIST-IRBL-25Visible Transmission from 400-600 nm and blocking for near IR and Mid IR.
BPF-1.3-2.5-25Transmits from 1.3-2.5 μm and blocks outside this range.
SWP-1.4-2.6-2590% ave. Transmission for 1.4-2.6 μm, blocks from 2.7-20μm.
LWP-1.65-25Long wave Pass filter, transmits above 1.65 μm and blocks below back to UV.
BPF-2070-2510-25Mid IR wide band pass filter for 2070-2500nm , used for non contact temperature measurement
BPF-3.0-5.0-25-Si90% Ave Transmission from 3-5 μm, blocks outside this to 7.5 μm on Silicon.
BPF-3.0-5.0-25-SAP90% Ave Transmission from 3-5 μm, blocks outside this to 20 μm on Sapphire.
Our IR Filters are deposited by sputtering using our ‘Rockard’ ? technology, traditionally thermal evaporation has been used for IR filters. Our technology ensures the following:
Highly durable coatings suitable for the toughest environments.
Extremely low temperature shift.
Reduced passband ripple for even response.
High blocking efficiency to increase signal to noise ratio.
A brief overview of IR Filter deposition technology is outlined below. Sputter deposition has a pRocess energy approximately 3x that of thermal evaporation, this is responsible for the densely packed structure. This structure leads to superior environmental properties as outlined above.
Traditional Thermal Evaporation
Sputter Deposition
Open structure of traditionally evaporated coatings with gaps and voids.
Voids in coating.
Poor environmental performance.
High shift with temperature change.
Densely packed sputtered coating with no gaps or voids.
Voids eliminated.
Excellent environmental performance.
Extremely low temperature shift.
Technical Terms for specifying Filters
Terms used for specifying Wide Band Pass Filters and Narrow Band Pass Filters, see diagrams and explanations below.
TermExplanationPassband Average TransmissionThis can be defined as the average transmission, in the passband, between the two points where transmission exceeds 80% of the peak value.CWLThis is the Centre Wavelength of the passband of the Filter, (see right hand figure above). The CWL is the distance in nm between the two points that are 50% of the peak Transmission.FWHMIt stands for ‘Full Width Half Maximum’ but is also referred to as the ‘width of a filter’. It is measured between the two points in nm or microns where Transmission equals half the maximum transmission.Slope of a FilterFor an edge filter this is the gradient of the filter expressed as a a percentage, the lower the value the steeper the edge. A bandpass filter has two slopes, see left hand diagram above.Slope of a filter (Left handside)The left hand slope is calculated as follows, (? 80% of Peak T in nm-? 5% of Peak T in nm)*100/? 5% of Peak T in nm, (see left diagram above)Slope of a filter (Right handside)The right hand slope is calculated as follows, (? 5% of Peak T in nm-? 80% of Peak T in nm)*100/? 80% of Peak T in nm,?(see left diagram above)Blocking rangeThe band over which the filter has a Transmission of near zero, this can be specified as the detector sensitivity range plus a 10% safety margin. It can also be defined with reference to the system illumination range.RippleThis normally refers to the allowed variation between maximum and minimum in the pass band of a filter. For example ripple variation to be< +/-5% form the passband average.
