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Choosing the Best Optical Filter for Your Application

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Choosing the Best Optical Filter for Your Application Choosing the Best Optical Filter for your Application www.midopt.com | 1 Filters are an essential tool for increasing: Contrast Resolution Image Quality www.midopt.com | 2 Choose a machine vision filter that: Enhances your imaging system Maximizes transmission Has superior surface quality Is free of distortion Can be mounted to any system www.midopt.com | 3 BANDPASS FILTERS • Most common filter used in machine vision • Hybrid design with optimal blocking High Peak • Increase contrast and resolution Transmission v Before Filter After Filter www.midopt.com | 4 BANDPASS FILTERS BROAD & NARROW BANDWIDTHS BROAD • Recommended for use with LEDs to pass entire wavelength emission Red Laser Line Broad Bandwidth Narrow Bandwidth NARROW • Recommended for use with laser Before Filter applications that have variable angles and short field of views Narrow Bandpass Filter • Can be used with LEDs in overwhelming ambient light conditions • Helpful in fluorescence applications Traditional Dichroic Filter After Filter www.midopt.com | 5 DICHROIC BANDPASS FILTERS • Traditional interference filter • Reflective design • Very narrow and customizable • Commonly used in the bio-medical industry Broad Narrow Dichroic BP Series BN Series Bi Series www.midopt.com | 6 Why is a hybrid design recommended over a traditional dichroic filter? DICHROIC FILTER HYBRID FILTER www.midopt.com | 7 What is the best filter to use over a high-temperature light source? HYBRID FILTER HIGH TEMPERATURE LIGHT SOURCE WITH RED FILTER DICHROIC FILTER www.midopt.com | 8 SHORTPASS FILTERS • Useful for achieving natural color rendition • Ideal for preventing laser damage www.midopt.com | 9 What type of Shortpass filter is recommended to protect my camera sensor from laser damage? Damaged sensor & image result Good sensor & imagewww.midopt.com result | 10 POLARIZERS • Reduce reflections and specular glare • Designed for visible and near-infrared spectrums • Offered in contrast ratios averaging 10,000:1 • Available in a variety of options: Linear Circular Wire Grid www.midopt.com | 11 Why don’t Polarizers work with polycarbonate enclosure windows? UNPOLARIZED PSA007 Polarizer Film PSA007 Polarizer Film & & AC380 Acrylic Filter Polycarbonate Window POLARIZED BIREFRINGENCE www.midopt.com | 12 NEUTRAL DENSITY FILTERS • Sunglasses for your system • Reduce light intensity • Create a shallow depth of field • Increase exposure and slow shutter speed • Offered in absorptive and reflective options BeforeBefore Filter AfterAfter Filter www.midopt.com | 13 NEUTRAL DENSITY FILTERS ABSORPTIVE DESIGN • Effective from 425-675nm • Available in optical densities ranging from 0.10 – 6.0 • Stackable to custom optical density ND030 ND060 ND090 ND120 ND200 ND300 ND400 O.D. = 0.3 O.D. = 0.6 O.D. = 0.9 O.D. = 1.2 O.D. = 2.0 O.D. = 3.0 O.D. = 4.0 www.midopt.com | 14 NEUTRAL DENSITY FILTERS REFLECTIVE DESIGN • Effective from 400-2000nm • Available in optical densities ranging from 0.3 – 1.2 • Coated on low-expansion, heat-resistant Borofloat® glass Ni030 Ni060 Ni090 Ni120 O.D. = 0.3 O.D. = 0.6 O.D. = 0.9 O.D. = 1.2 www.midopt.com | 15 MULTIBANDPASS FILTERS • Day/night imaging capabilities • Achieve accurate color rendition • Ideal for agricultural inspection / NDVI & ENDVI • Commonly used in aerial imaging • Can be custom sized or mounted up to 80mm www.midopt.com | 16 Can Multibandpass filters be used on any camera? www.midopt.com | 17 LONGPASS FILTERS • Economical solution for isolating wavelength regions • Can be combined with Shortpass filters • Double-side polished with anti-reflection coating TRADITIONAL FILTER GLASS LP340 A/R COATED GLASSwww.midopt.com | 18 ACRYLIC LONGPASS FILTERS • Economical protection window • Optical-grade acrylic material • Available with anti-reflection coating • Can be custom laser cut • Offered for visible and near-IR imaging www.midopt.com | 19 How does acrylic material compare to glass? AC380 Acrylic Protective Window LP340 Glass Protective Window www.midopt.com | 20 Is it better to mount the filter behind or in front of the lens? Threaded Mount Filter in front of lens 25.4® C-Mount Filter behind lens www.midopt.com | 21 Key Features of Machine Vision Filters: Stable performance at variable angles Superior transmission and passband design Optimal flatness and surface quality www.midopt.com | 22 STABLE FILTERS • Less susceptible to angle of incidence (short- shifting) • Works well with short focal length lenses • Superior out-of-band blocking Red Laser Line – No Filter With StablEDGE® Filter With Traditional Filter White Light MidOpt BP850 Near-IR Competitor Traditional StablEDGE® Filter Interference Near-IR Filter www.midopt.com | 23 GAUSSIAN TRANSMISSION CURVE • Specially designed for machine vision • Emulates the output of the most common LEDs • Anti-reflection coatings ensure high peak transmission • Better contrast than broad, flat-top filters Color Image with Ambient Light Competitor Red Flat Top Filter MidOpt Red Gaussian Filter www.midopt.com | 24 UNMATCHED OPTICAL PERFORMANCE • Optically flat for low distortion • Near-flawless surface quality • Repeatable performance / lot controlled 40/20 Scratch Dig COMING • 100% quality inspection SOON MidOpt Filter Competitor Filter Reject Filter Good Filter www.midopt.com | 25 AUTOMATED INSPECTION & ASSEMBLY • Surface quality inspection • Torque control • Precision assembly www.midopt.com | 26 THANK YOU [email protected] | +1 (847) 359-3550 | www.midopt.com www.midopt.com | 27.
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