应用光学课件：optical_system

1、Integration of Optical Systems,DEFINING THE APPLICATION,The first step Imaging System Imaging systems transfer a representation of the object to a detector, such as a CCD or your eye. The goal of an imaging system is to provide sufficient image quality to enable extraction of desired information abo

2、ut the object from the image. Non-Imaging System Non-imaging systems collect, disperse, resize, focus, or collimate light. Some examples of non-imaging systems are: illumination projection, fiber coupling and laser projection.,The second step to determine the primary parameters of your system Conjug

3、ate Distances Conjugate Sizes Numerical Aperture (NA) and F-Number (F/#) Resolution and Spot Size,SOLUTION FORMS,Most application solutions can be divided into three types of designs:,Case 1: Finite/Finite Conjugates,Common Applications: Electronic Imaging, Relay Systems and Image Projection,Single

4、Element the simplest form the effective focal length is equal to the focal length of the single lens in the system cost effectiveness and its simplicity of design. Two Element to combine elements to achieve different effective focal lengths while increasing the image performance a bit more complex R

5、eal Lens Solutions For imaging applications, achromats Singlets (PCX or DCX) are typically used in illumination based relays,Case 2: Infinite/Infinite Conjugates,Common Applications: Telescopes and Beam Expanders,Two Positive Elements using two positive elements yields an intermediate image using tw

6、o positive elements will result in a negative magnification. One Positive Element and One Negative Element most high power laser applications utilize this form for beam expansion. system length is greatly reduced an erect image Real Lens Solutions achromatic lenses are typically used for improving f

7、ield efficiency.,Case 3: Infinite/Finite Conjugates,Common Applications: Autocollimators, Light Detection and Infinity-Corrected Objectives,CASE STUDY: wire bond inspection,Parameters: Field of view required is 5mm. The imaging sensor is a 1/2 format CCD with a horizontal sensing distance of 6.4mm.

8、the object distance must be 50mm or greater.,Paraxial solution,Finding a real lens,Based on our solution above we need a lens with a focal length of 28.07mm, a lens with 30mm focal length is chosen, given that a focal length of 28.07mm is not available off-the-shelf. Since this is an imaging applica

9、tion, achromats can be used to improve image quality. A good lens choice would be to use a 25mm diameter achromat with 30mm focal length,Optimization,Mechanical Integration,Retainer vs. SpacerRetainers generally offer tighter control over the elements position, tilt and centering because the lens sits on a counterbored seat. Spacers are ideal for small assemblies and are cost effective though they yield looser lens spacing tolerance than with retainer rings. Focusing/AdjustmentCommon focusin