Welcome to the Xi’an Optical Metrology Photoelectric Technology Co., Ltd.  
 
中文 | Contact Us | E-mail
 
 
 
 
  Technical Principle
 
Principle of photoelectric autocollimator
Principle of photoelectric goniometer
Principle of focal length measurement
Pinciple of the eccentricity measurement of lens
  Applications
 
Autocollimator measuring straightness
Autocollimator measuring flatness
Autocollimator measurement precision rotary turntable
Autocollimator measurement of optical wedge angle and plat
Dihedral angle measurement by AngleAIM goniometer
Centration error measurement by transmission mode
Centration error measurement by reflection mode
Measurement of radius curvature
Flange focal length measurement
Back focal length measurement
Pyramidal error measurement
Spatial parallel adjusting
 
 
  Applications Your location of:Home > Technology > Applications
 

Back focal length measurement

2014-5-27 | Editor:Xian optical Metrology | Views:2577 | Content Source:Editor by the company




    For the measurement of the back focal length the distance between the rear focus and the surface is measured.

    The specimen produces an image of the reticle in its rear focal plane, which is usually located behind the last lens surface. The measurement is done in two steps:

    1) First the telescope with attachment achromat is moved such that the image of the collimator reticle appears on the camera.

    2) In the second step, the telescope is moved such that the surface of the specimen is sharp in the view, The distance between the two positions is the back focal length to be measured:


 

 
 
 
 
 
Print||Close  
 
 
Copyright © 2008-2016 | Xi’an Optical Metrology Photoelectric Technology Co., Ltd. All rights reserved Shaanxi ICP No. 13000505