Choosing the Best Optical Filter for your Application. 1

Transcription

1 Choosing the Best Optical Filter for your Application 1

2 Filters are an essential tool for increasing: Contrast Resolution Image Quality 2

3 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 3

4 BANDPASS FILTERS Most common filter used in machine vision Hybrid design with optimal blocking Increase contrast and resolution High Peak Transmission v Before Filter After Filter 4

5 BANDPASS FILTERS BROAD & NARROW BANDWIDTHS BROAD Recommended for use with LEDs to pass entire wavelength emission NARROW Broad Bandwidth Recommended for use with laser applications that have variable angles and short field of views Red Laser Line Narrow Bandwidth Before Filter Narrow Bandpass Filter Can be used with LEDs in overwhelming ambient light conditions Helpful in fluorescence applications Traditional Dichroic Filter After Filter 5

6 DICHROIC BANDPASS FILTERS Traditional interference filter Reflective design Very narrow and customizable Commonly used in the bio-medical industry Broad BP Series Narrow BN Series Dichroic Bi Series 6

7 Why is a hybrid design recommended over a traditional dichroic filter? DICHROIC FILTER HYBRID FILTER 7

8 What is the best filter to use over a high-temperature light source? HYBRID FILTER HIGH TEMPERATURE LIGHT SOURCE WITH RED FILTER DICHROIC FILTER 8

9 SHORTPASS FILTERS Useful for achieving natural color rendition Ideal for preventing laser damage 9

10 What type of Shortpass filter is recommended to protect my camera sensor from laser damage? Damaged sensor & image result Good sensor & image result 10

11 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 11

12 Why don t Polarizers work with polycarbonate enclosure windows? UNPOLARIZED PSA007 Polarizer Film & AC380 Acrylic Filter PSA007 Polarizer Film & Polycarbonate Window POLARIZED BIREFRINGENCE 12

13 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 Before Filter After Filter 13

14 NEUTRAL DENSITY FILTERS ABSORPTIVE DESIGN Effective from nm Available in optical densities ranging from Stackable to custom optical density ND030 O.D. = 0.3 ND060 O.D. = 0.6 ND090 O.D. = 0.9 ND120 O.D. = 1.2 ND200 O.D. = 2.0 ND300 O.D. = 3.0 ND400 O.D. =

15 NEUTRAL DENSITY FILTERS REFLECTIVE DESIGN Effective from nm Available in optical densities ranging from Coated on low-expansion, heat-resistant Borofloat glass Ni030 O.D. = 0.3 Ni060 O.D. = 0.6 Ni090 O.D. = 0.9 Ni120 O.D. =

16 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 16

17 Can Multibandpass filters be used on any camera? 17

18 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 GLASS 18

19 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 19

20 How does acrylic material compare to glass? AC380 Acrylic Protective Window LP340 Glass Protective Window 20

21 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 21

22 Key Features of Machine Vision Filters: Stable performance at variable angles Superior transmission and passband design Optimal flatness and surface quality 22

23 STABLE FILTERS Less susceptible to angle of incidence (shortshifting) 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 StablEDGE Filter Competitor Traditional Interference Near-IR Filter 23

24 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 24

25 UNMATCHED OPTICAL PERFORMANCE Optically flat for low distortion Near-flawless surface quality Repeatable performance / lot controlled 100% quality inspection MidOpt Filter 40/20 Scratch Dig COMING SOON Competitor Filter Reject Filter Good Filter 25

26 AUTOMATED INSPECTION & ASSEMBLY Surface quality inspection Torque control Precision assembly 26

27 THANK YOU +1 (847)