MidOpt Filters
Bandpass Filters
MidOpt Bandpass Filters are the simplest, quickest and most cost-effective way to improve the image contrast, repeatability, and long term stability of any industrial vision system.
Definition:
A bandpass filter transmits a specific portion of the spectrum while blocking shorter and longer wavelengths. Increasing signal-to-noise results in improved contrast and better control over changes that may occur over time in ambient lighting conditions. In the case of bandpass filters, “broad” and “rugged” are necessary in most machine vision applications. This allows for use with wide angle lenses and for variations in the spectral output of LEDs and laser diodes, while providing environmental stability and mechanical durability.
MidOpt Bandpass Filters are divided into Three Series:
- BP Series – Broad Bandwidth.For standard machine vision and surveillance applications
- BN Series – Narrow Bandwidth. For outdoor applications or situations involving overwhelming ambient light
- Bi Series – Narrow Interference Bandwidth. For laser diode or other narrow spectrum light source applications
BP Series – Broad Bandwidth
| Color | Part # | Bandpass Description | Wavelength Range | FWHM |
|---|---|---|---|---|
| BP250 | Deep-to-Near UV | 230-275nm | 70nm | |
| BP324 | Near UV | 290-365nm | 105nm | |
| BP340 | Near UV | 315-365nm | 80nm | |
| BP365 | Near UV | 335-400nm | 80nm | |
| BP450 | Indigo | 450-470nm | 60nm | |
| BP470 | Blue | 435-495nm | 85nm | |
| BP485 | Absorptive Visible /Near-IR Block | 380-585nm | 285nm | |
| BP500 | Green- Blue | 440-555nm | 248nm | |
| BP505 | Cyan | 485-550nm | 90nm | |
| BP525 | Light Green | 500-555nm | 80nm | |
| PE530 | Photopic Response Filter | 495-550nm | 120nm | |
| BP540 | Limited Availability | 515-5 60nm | 65nm | |
| BP550 | NIR/UV Block-Visible | 410-690nm | 300nm | |
| BP590 | Orange | 560-600nm | 70nm | |
| BP635 | Light Red | 610-650nm | 65nm | |
| BP660 | Dark Red | 640-680nm | 65nm | |
| BP695 | Near-IR | 680-720nm | 65nm | |
| BP735 | Near-IR | 715-780nm | 90nm | |
| BP800 | Near-IR | 745-950nm | 315nm | |
| BP810 | Limited Availability | 790-830nm | 65nm | |
| BP845 | Near-IR | 830-865nm | 60nm | |
| BP850 | Near-IR | 820-910nm | 160nm | |
| BP880 | Near-IR | 845-930nm | 130nm | |
| BP1000 | SWIR | 930-1030nm | 150nm | |
| BP1550 | New SWIR | 1485-1645nm | 190nm |
BN Series – Narrow Bandwidth
| Color | Part # | Bandpass Description | Wavelength Range | FWHM |
|---|---|---|---|---|
| BN450 | Narrow Indigo | 435-465nm | 45nm | |
| BN470 | Narrow Blue | 460-490nm | 50nm | |
| BN485 | Limited Availability | 480-490nm | 35nm | |
| BN490 | Limited Availability | 475nm-500nm | 40nm | |
| BN520 | Narrow Green | 510-545nm | 55nm | |
| BN532 | Narrow Green | 525-550nm | 55nm | |
| BN535 | Narrow Green | 520-545 nm | 40nm | |
| BN595 | Narrow Orange | 580-610nm | 45nm | |
| BN630 | Narrow Light Red | 625-645nm | 45nm | |
| BN650 | Narrow Red | 638-672nm | 50nm | |
| BN660 | Narrow Dark Red | 645-675nm | 45nm | |
| BN740 | Narrow Near-IR | 730-755nm | 50nm | |
| BN785 | Narrow Near-IR | 770-790nm | 45nm | |
| BN810 | Narrow Near-IR | 798-820nm | 50nm | |
| BN850 | Narrow Near-IR | 840-865nm | 45nm | |
| BN880 | Narrow Near-IR | 855-890nm | 45nm | |
| BN940 | Narrow Near-IR | 920-955nm | 55nm |
Bi Series – Narrow Interference Bandwidth
| Color | Part # | Bandpass Description | Wavelength Range | FWHM |
|---|---|---|---|---|
| Bi350 | New Near UV | 344-358nm | 20nm | |
| Bi385 | New Near UV | 370-390nm | 25nm | |
| Bi405 | Violet Interference | 390-410nm | 35nm | |
| Bi440 | Limited Availability | 425-455nm | 32nm | |
| Bi450 | New Blue | 445-465nm | 35nm | |
| Bi518 | Limited Availability | 510-525nm | 20nm | |
| Bi525 | New Light Green | 518-538nm | 28nm | |
| Bi550 | Green | 535-558nm | 33nm | |
| Bi615 | New Amber | 605-620nm | 23nm | |
| Bi632 | Light Red | 625-640nm | 28nm | |
| Bi650 | Red | 643-665nm | 30nm | |
| Bi660 | Dark Red | 650-665nm | 28nm | |
| Bi685 | New Dark Red | 650-665nm | 30nm | |
| Bi725 | New Red Edge Bandpass Filter | 717-7325nm | 25nm | |
| Bi750 | New Near-IR Interference | 740-765nm | 30nm | |
| Bi780 | Limited Availability | 765-795nm | 35nm | |
| Bi808 | Near-IR | 798-820nm | 35nm | |
| Bi830 | Limited Availability | 810-850nm | 50nm | |
| Bi832 | New Near-IR Interference | 822-846nm | 40nm | |
| Bi850 | Near-IR Interference Bandpass Filter | 845-860nm | 33nm | |
| Bi880 | Limited Availability | 870-890nm | 30nm | |
| Bi905 | New Near-IR Interference | 895-915nm | 30nm | |
| Bi940 | New Near-IR Interference | 930-952nm | 32nm | |
| Bi1300 | New SWIR | 1290-1310nm | 35nm | |
| Bi1450 | New SWIR | 1440-1460nm | 35nm | |
| Bi1550 | New SWIR | 1540-1560nm | 35nm |
Features
- Available in UV, VIS and NIR passbands
- Achieve optimal contrast
- Improve system control, repeatability and stability
- Block interfering wavelengths, eliminating the need for shrouds
- Increase resolution by reducing chromatic aberration
- Anti-reflection coated for maximum transmission
- Hard coated, single substrate fabrication
- Exceptional surface quality; 40/20 scratch/dig
*With the exception of BP365 > 85%
General Availability
- For UV, Visible and/or Near-IR wavelengths
- Standard threaded mount sizes from M22.5 up to M105
- Mounting Options: Mounts for standard filter threads, C/CS mounts, Slip mounts, Unmounted
- Custom shapes and sizes; mounted or unmounted versions available
Ultraviolet (UV)
- UV Pass filters transmit selected UV wavelength ranges. Typically these filters must pass UV light while blocking visible and near-IR wavelengths. They can be placed over lenses and are sometimes placed over UV light sources to trim/block output of visible light.
- UV Blocking filters typically transmit visible light while blocking UV light over a specified range. One example where these are used is in UV fluorescence applications.
Visible
- Block all unwanted visible, UV and near-IR wavelengths except for a specific portion of the visible spectrum. Typically these are matched to the wavelength output of an LED light, laser diode or visible fluorescence emitted by an inspection subject following excitation with UV light. In these cases the subject typically appears white or lighter in color when the filter is used together with a monochrome camera.
- Improve resolution by reducing the wavelength range of light allowed to pass through the camera lens, thus eliminating chromatic aberrations.
Near-Infrared (Near-IR)
- Near-IR Pass filters block all UV and visible wavelengths so that maximum contrast can be achieved while using near-IR illumination provided by the sun or artificial light sources. Often they are matched to the output wavelength of an LED or laser diode. In the presence of normal room light or daylight conditions, the desired contrasting effect is often completely lost without the use of a near-IR pass filter.
- Near-IR blocking filters block all or selected near infrared (and sometimes red) wavelengths of light. This is particularly important in color imaging applications in order for a color camera to be able to produce good color rendition. When used together with a monochrome camera, these filters can also help to alleviate problems caused by overly bright lighting conditions.
- Improve resolution in the IR
Useful for
Industrial inspection, security, traffic control, medical and forensic applications
Applications
Bandpass Filters are used in a variety of industries, including machine vision,factory automation, security and surveillance, license plate recognition, medical and life science, agricultural inspection, aerial imaging, motion analysis, photography and cinematography.
