DETECTING APPARATUS AND DETECTING METHOD THEREOF

• US 20130100280A1
• Filed: 09/10/2012
• Published: 04/25/2013
• Est. Priority Date: 10/21/2011
• Status: Active Grant

• Current Assignee: National Central University
• Original Assignee: Ching-Cherng Sun, Wei-Hsin Chen, Yeh-Wei Yu, Yen-Lin Chen
• Inventors: SUN, Ching-Cherng, YU, Yeh-Wei, CHEN, Yen-Lin, CHEN, Wei-Hsin
• Granted Patent: US 9,952,090 B2
• Time in Patent Office: Days
• US Class Current: 348/135
• CPC Class Codes: G01J 1/0266 Field-of-view determination; Aiming or pointing of a photometer; Adjusting alignment; Encoding angular position; Size of the measurement area; Position tracking; Photodetection involving different fields of view for a single detector
• CPC Class Codes: G01J 1/0403 Mechanical elements; Supports for optical elements; Scanning arrangements
• CPC Class Codes: G01J 1/0474 Diffusers cavities G01J2001/0481
• CPC Class Codes: G01J 2001/4247 for testing lamps or other light sources
• CPC Class Codes: G01J 2001/4252 for testing LED's

Abstract

A detecting apparatus for detecting an object includes at least a screen, at least a detecting unit and at least a holding unit. The screen is partial light-permeable and has a first surface and an opposite second surface. The object is disposed adjacent to the first surface of the screen. The detecting unit is disposed corresponding to the object and located adjacent to the second surface of the screen. The holding unit holds the relative distances between the screen, the object and the detecting unit. The detecting unit captures the image of the second surface of the screen so as to calculate the optical field distribution of the object. The detecting apparatus can measure the optical field distribution of an object quickly and has the advantages of low cost and high accuracy.

Claims

1. A detecting apparatus for detecting an object, comprising:

at least a screen, which is partial light-permeable and has a first surface and a second surface opposite to each other, wherein the object is disposed adjacent to the first surface of the screen;

at least a detecting unit disposed corresponding to the object and located adjacent to the second surface of the screen; and

at least a holding unit for holding relative distances between the screen, the object and the detecting unit, wherein the detecting unit captures an image of the second surface of the screen so as to calculate an optical field distribution of the object.

2. The detecting apparatus of claim 1, wherein the object comprises a light source or an optical film.

3. The detecting apparatus of claim 1, wherein the material of the screen comprises paper, cloth, fiber, plastic, flannel paper, glass, acrylic, or diffusion sheet.

4. The detecting apparatus of claim 1, wherein the screen comprises a screen body and a carbon layer or a printing layer, and the carbon layer or the printing layer is disposed on the first surface.

5. The detecting apparatus of claim 4, wherein the carbon layer or the printing layer comprises a plurality of recesses for exposing the screen body.

6. The detecting apparatus of claim 1, wherein the screen further comprises a transparent substrate closely attached to the second surface.

7. The detecting apparatus of claim 1, wherein the detecting unit comprises a luminance meter, a lux meter, a power meter, a camera, or a spectrometer.

8. The detecting apparatus of claim 1, wherein the detecting unit further comprises a Galvo mirror assembly for scanning the image of the second surface of the screen.

9. The detecting apparatus of claim 1, wherein the optical field distribution comprises a light intensity distribution, a color distribution, or a spectrum distribution.

10. The detecting apparatus of claim 1, wherein the holding unit comprises a moveable frame having a plurality of positions with respect to the object.

11. The detecting apparatus of claim 10, wherein the detecting unit captures a plurality of images of the second surface of the screen when the moveable frame is respectively located at the positions.

12. The detecting apparatus of claim 11, wherein the optical field distribution of the object is calculated according to the captured images.

13. The detecting apparatus of claim 1, wherein when the numbers of the screens, the detecting units and the holding units are more than 1, the detecting units capture the images of the second surfaces of the screens.

14. The detecting apparatus of claim 10, wherein the holding unit further comprises a shaft for rotating the moveable frame, so that the moveable frame has the positions with respect to the object.

15. The detecting apparatus of claim 10, further comprising:

a cover in which the screen, the moveable frame, the detecting unit and the object are disposed.

16. The detecting apparatus of claim 15, wherein the cover has a track, and the moveable frame moves along the track.

17. The detecting apparatus of claim 1, further comprising:

a rotating unit for carrying and rotating the object so as to change an angle of the object toward the screen or change an angle between the object and an incident light.

18. The detecting apparatus of claim 1, further comprising:

a rotating unit for carrying and rotating the screen, the detecting unit and the holding unit so as to change an angle of the object toward the screen.

19. The detecting apparatus of claim 11, further comprising:

a calculating unit for performing a light intensity correction and conversion of the images captured by the detecting unit and performing a coordinate transform to the same coordinate system.

20. The detecting apparatus of claim 13, further comprising:

a calculating unit for performing a light intensity correction and conversion of the images captured by the detecting unit and performing a coordinate transform to the same coordinate system.

21. The detecting apparatus of claim 11, further comprising:

a calculating unit for performing a light intensity correction and conversion of the images captured by the detecting unit, performing a coordinate transform to the same coordinate system, and calculating their total flux.

22. The detecting apparatus of claim 13, further comprising:

a calculating unit for performing a light intensity correction and conversion of the images captured by the detecting unit, performing a coordinate transform to the same coordinate system, and calculating their total flux.

23. The detecting apparatus of claim 1, wherein when the object is an optical film, the detecting unit further comprises a light source for emitting a light beam to the optical film.

24. The detecting apparatus of claim 15, wherein when the object is an optical film, the screen, the cover or the holding unit has a through hole allowing a light source to irradiate the optical film.

25. A method for detecting an optical field distribution of an object, which is applied to a detecting apparatus having at least a screen and at least a detecting unit, wherein the screen is partial light-permeable and has a first surface and a second surface opposite to each other, the object is disposed adjacent to the first surface of the screen, the detecting unit is disposed corresponding to the object and located adjacent to the second surface of the screen, the method comprising the steps of:

capturing an image of the second surface of the screen by the detecting unit;

changing an angle of the object toward the screen;

capturing another image of the second surface of the screen by the detecting unit; and

calculating the optical field distribution and a total flux of the object according to the captured images.

26. The method of claim 25, further comprising:

performing calibration and correction for the images captured by the detecting unit.

27. The method of claim 25, further comprising:

performing an energy conversion for data of the images, and performing a coordinate transform to the same coordinate system.

28. The method of claim 25, wherein the optical field distribution comprises a light intensity distribution, a color distribution, or a spectrum distribution.

29. The method of claim 25, further comprising:

measuring a standard light source with a known total flux.

30. The method of claim 25, wherein when the numbers of the screens and the detecting units are more than 1, the detecting units capture the images of the second surfaces of the screens.

31. The method of claim 25, wherein an angle of the object toward the screen is changed by a moveable frame and/or a rotating unit.

32. The method of claim 31, wherein the rotating unit carries and rotates the object, or carries and rotates the screen, the detecting unit and the moveable frame.

33. The method of claim 25, after calculating the optical field distribution of the object according to the captured images, further comprising:

calculating the total flux by integration.

34. A method for detecting an optical field distribution of an object, which is applied to a detecting apparatus having at least a screen and at least a detecting unit, wherein the screen is partial light-permeable and has a first surface and a second surface opposite to each other, the object is disposed adjacent to the first surface of the screen, the detecting unit is disposed corresponding to the object and located adjacent to the second surface of the screen, the method comprising the steps of:

capturing an image of the second surface of the screen by the detecting unit;

changing an angle of the object toward the screen;

capturing another image of the second surface of the screen by the detecting unit;

performing an energy conversion for data of the images, and performing a coordinate transform to the same coordinate system; and

calculating the optical field distribution and a total flux of the object according to the captured images.