Strictly confidential Introduction to Lenses 07/28/2015: 2014 Applied Core Technology Inc., All Rights Introduction to lenses.

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Presentation transcript:

strictly confidential Introduction to Lenses 07/28/2015: 2014 Applied Core Technology Inc., All Rights Introduction to lenses

strictly confidential Introduction to Lenses 07/28/2015: 2014 Applied Core Technology Inc., All Rights 2 Overview 3.Lens Terms 3.Focal Length 4.FOV 5.Lens Sensor Size 6.Working Distance/ Depth of Field 7.Magnification 8.Aperture 9.Resolution 10.Telecentric 11.CCTV

strictly confidential Introduction to Lenses 07/28/2015: 2014 Applied Core Technology Inc., All Rights 3 Lens Terms  Focal Length (F, EFL, FL): Distance from the front of your lens to your camera’s sensor.  Longer focal length = Narrower field of view  Field of View (FOV): Image area expressed as rectangular dimensions: H x V, or angularly Horizontal degrees x Vertical degrees, or diagonal measurement  Lens Sensor Size: Size of image projected at the focal point of the lens.  Sensor size should be >= camera sensor size.  Uses Single measurements: ½”, 2/3”, 1” etc.  Working Distance (WD): Distance from front of lens to object under inspection.  Depth of Field (DoF): The distance from the front of your focus area to the back of your focus area  Magnification: (Sensor Size)/(FOV) Higher magnification means your spreading a small image over a large sensor  Telecentric lens: A type of lens used for measurement applications that has low distortion, fixed working distance, and fixed magnification.  CCTV Lens: Fixed angular field of view, ability to adjust working distance giving you different rectangular fields of view. Good for low light applications with larger FOVs.

strictly confidential Introduction to Lenses 07/28/2015: 2014 Applied Core Technology Inc., All Rights 4 Focal Length Longer Focal Length = Narrower FOV Shorter Focal Length = Wider FOV

strictly confidential Introduction to Lenses 07/28/2015: 2014 Applied Core Technology Inc., All Rights 5 Field of View (FOV)  Rectangular FOV (Horizontal x Vertical)  Angular FOV (Horizontal Angle x Vertical Angle)

strictly confidential Introduction to Lenses 07/28/2015: 2014 Applied Core Technology Inc., All Rights 6 Lens Sensor Size  Size of Image projected at the back of the lens.  Larger sensor size means larger FOV  Must be greater than or equal to camera sensor size.

strictly confidential Introduction to Lenses 07/28/2015: 2014 Applied Core Technology Inc., All Rights 7 Working Distance (WD) Depth of Field (DoF)  Working Distance: The distance from the front of the lens to the object  Depth of Field: The vertical distance that is in focus

strictly confidential Introduction to Lenses 07/28/2015: 2014 Applied Core Technology Inc., All Rights 8 Magnification  Magnification = (Camera Sensor Size) / (Rectangular FOV)

strictly confidential Introduction to Lenses 07/28/2015: 2014 Applied Core Technology Inc., All Rights 9 Aperture (f/)  Expressed as ratio of focal length to effective aperture diameter  Smaller aperture diameter = Longer depth of field  Smaller aperture diameter = Less light (signal)  Smaller aperture = larger Airy Disk due to diffraction

strictly confidential Introduction to Lenses 07/28/2015: 2014 Applied Core Technology Inc., All Rights 10 Lens Resolution  Ability of a lens to distinguish between distinct objects,  Expressed as the minimum distance between these objects eg. 5um

strictly confidential Introduction to Lenses 07/28/2015: 2014 Applied Core Technology Inc., All Rights 11 Telecentric Lenses  Fixed working distance  Fixed magnification  Strengths: Measurement applications, high magnification applications,  Weaknesses: Low light performance, Cost

strictly confidential Introduction to Lenses 07/28/2015: 2014 Applied Core Technology Inc., All Rights 12 Fixed Angle Lens (FA, CCTV) Minimum Working Distance (highest achievable magnification)  Adjustable Working Distance ( usually >.1m, must be greater than minimum)  Fixed Angular Field of View  Adjustable Aperture  Strengths: Low light conditions, Large FoV, Adjustable FoV, Cost,  Weaknesses: Distortion at short working distances, low magnification

strictly confidential Introduction to Lenses 07/28/2015: 2014 Applied Core Technology Inc., All Rights 13 Contact Information: 2372 Walsh Ave., Santa Clara, CA (408)