Detecting apparatus and detecting method thereof

• US 9,952,090 B2
• Filed: 09/10/2012
• Issued: 04/24/2018
• Est. Priority Date: 10/21/2011
• Status: Expired due to Fees

• Current Assignee: National Central University
• Original Assignee: National Central University
• Inventors: Sun, Ching-Cherng, Yu, Yeh-Wei, Chen, Yen-Lin, Chen, Wei-Hsin
• Primary Examiner(s): Rahaman, Mohammed
• Assistant Examiner(s): ABIMBOLA, KEHINDE
• Application Number:
  US13/608,288
• Publication Number:
  US 20130100280A1
• Time in Patent Office: 2,052 Days
• 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:

multiple screens, each of the screens is non-electroluminescent and at least partial light-permeable and has a first surface and a second surface opposite to each other, wherein the object is disposed on a side of the first surface of each screen;

multiple detecting units, each of the detecting units is disposed corresponding to the object and located on a side of the second surface of each screen; and

multiple holding units, wherein the object is a light source or an optical film, and when a light emitted from the object passes through each screen to reach each detecting unit, the detecting units capture images of the second surfaces of the screens so as to calculate optical field distributions of the object while the multiple holding units hold fixed relative distances between each screen, the object and each detecting unit.

2. The detecting apparatus of claim 1, wherein the material of the screens comprise paper, cloth, fiber, plastic, flannel paper, glass, acrylic, or diffusion sheet.

3. The detecting apparatus of claim 1, wherein each of the screens 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.

4. The detecting apparatus of claim 3, wherein the carbon layer or the printing layer comprises a plurality of recesses for exposing the screen body.

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

6. The detecting apparatus of claim 1, wherein each of the detecting units comprises a luminance meter, a lux meter, a power meter, a camera, or a spectrometer.

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

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

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

10. The detecting apparatus of claim 9, wherein each of the detecting units captures a plurality of images of the second surface of each of the screens when the moveable frame is respectively located at the positions.

11. The detecting apparatus of claim 10, wherein the optical field distributions of the object are calculated according to the captured images.

12. The detecting apparatus of claim 9, wherein each of the holding units further comprises a shaft for rotating the moveable frame, so that the moveable frame has the positions with respect to the object.

13. The detecting apparatus of claim 9, further comprising:

a cover in which the screens, the moveable frames, the detecting units and the object are disposed.

14. The detecting apparatus of claim 13, wherein the cover has a track, and the moveable frames move along the track.

15. 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 screens or change an angle between the object and an incident light.

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

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

17. The detecting apparatus of claim 1, 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.

18. The detecting apparatus of claim 1, 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.

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

20. A method for detecting an optical field distribution of an object, which is applied to a detecting apparatus having multiple screens and multiple detecting units, wherein each of the screens is non-electroluminescent and at least partial light-permeable and has a first surface and a second surface opposite to each other, the method comprising the steps of:

positioning the object on a side of the first surface of each screen, and positioning the detecting units corresponding to the object and located on a side of the second surface of each screen, wherein the object is a light source or an optical film;

capturing images of the second surfaces of the screens by the detecting units when a light emitted from the object passes through each screen to reach each detecting unit, while relative distances between each screen, the object and each detecting unit are held fixed;

changing an angle of the object toward each of the screens;

capturing other images of the second surfaces of the screens by the detecting units; and

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

21. The method of claim 20, further comprising:

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

22. The method of claim 20, further comprising:

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

23. The method of claim 20, wherein the optical field distributions comprise a light intensity distribution, a color distribution, or a spectrum distribution.

24. The method of claim 20, further comprising:

measuring a standard light source with a known total flux.

25. The method of claim 20, wherein an angle of the object toward each of the screens is changed by a moveable frame and/or a rotating unit.

26. The method of claim 25, wherein the rotating unit carries and rotates the object, or carries and rotates the screens, the detecting units and the moveable frame.

27. The method of claim 20, after calculating the optical field distributions of the object according to the captured images, further comprising:

calculating the total flux by integration.

28. A method for detecting an optical field distribution of an object, which is applied to a detecting apparatus having multiple screens and multiple detecting units, wherein each of the screens is non-electroluminescent and at least partial light-permeable and has a first surface and a second surface opposite to each other, the method comprising the steps of:

positioning the object on a side of the first surface of each screen, and positioning the detecting units corresponding to the object and located on a side of the second surface of each screen, wherein the object is a light source or an optical film;

capturing images of the second surfaces of the screens by the detecting units when a light emitted from the object passes through each screen to reach each detecting unit, while relative distances between each screen, the object and each detecting unit are held fixed;

changing an angle of the object toward each of the screens;

capturing other images of the second surfaces of the screens by the detecting units;

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

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