Light standard for microscopy

• US 6,969,843 B1
• Filed: 10/17/2002
• Issued: 11/29/2005
• Est. Priority Date: 10/19/2001
• Status: Expired due to Fees

• Current Assignee: Virginia Technologies, Inc.
• Original Assignee: Virginia Technologies, Inc.
• Inventors: Ross, Robert A., Beach, James M., Hudson, Josef K.
• Primary Examiner(s): PYO, KEVIN K
• Application Number:
  US10/273,332
• Time in Patent Office: 1,139 Days
• Field of Search: 250/205, 250/228, 250/216, 250/201.3, 315/121, 315/182, 315/183, 356/230, 356/236, 362/276, 362/293
• US Class Current: 250/228
• CPC Class Codes: G01J 1/32 adapted for automatic variation of the measured or reference value regulation of light intensity G05D25/00
• CPC Class Codes: G01N 21/274 Calibration, base line adjustment, drift correction
• CPC Class Codes: G01N 21/6458 Fluorescence microscopy fluorescence microscopes per se G02B21/0076 and G02B21/16
• CPC Class Codes: G02B 21/086 for transillumination only
• CPC Class Codes: G02B 21/365 Control or image processing arrangements for digital or video microscopes G02B21/361, G02B21/362 take precedence

Abstract

The disclosed light standard system provides flat field illumination through the use of an integrating light chamber which is in communication with a microprocessor. The light chamber has at least one high performance light source, such as LED'"'"'s, recessed within the walls and positioned to prevent light from directly exiting the chamber. A photosensor monitors multiple parameters within the chamber and interacts with the microprocessor to control intensity, temperature and wavelengths. The lights standard operates in benchmark, ratio light, linearity and transient response modes with all parameters being programmable and storable within said microprocessor.

Claims

1. A method of integrating light within a chamber, comprising the steps of:

a. placing a first flat end of an integrating chamber on a microscope stage, said integrating chamber being a cylinder having a diffusively reflective interior,

b. enabling light of at least one wavelength to enter said chamber through at least one light aperture from at least one light source,

c. monitoring the intensity of said light within said chamber with a photosensor, said photosensor being recessed within the wall of said chamber and being in visual communication with said light,

d. using a microprocessor as an input source selecting from the list of functions comprising at least one of benchmark mode, linearity scan mode, step mode, ratio light mode or monitor mode.

2. The method of claim 1 wherein one of said at least one light source is light entering through an exit aperture in a second flat end.

3. The system of claim 2 further comprising the steps of said monitor mode:

a. measuring the light having entered said chamber through said exit aperture with said photosensor,

b. identifying and storing the readings of said photosensor within said microprocessor input.

4. The system of claim 3 further comprising the step of recalling said readings to compare a current reading with a stored reading.

5. The system of claim 3 further comprising the step of connecting the output of said photosensor with an oscilloscope and monitoring fast intensity fluctuations of said microscope illuminator thereby predicting impending illuminator lamp failure.

6. The method of claim 1 further comprising the step of said light entering said chamber originating from a microscope illuminator.

7. The method of claim 3 further comprising the step of identifying and storing readings of said photosensor for exact reproduction of a set up of a prior experiment.

8. The method of claim 1 wherein one of said at least one light aperture is an exit aperture and another of said at least one light aperture is at least one entrance aperture recessed within the wall of, and in visual communication with, said chamber.

9. The method of claim 8 further comprising the step of said light within said chamber exiting said exit aperture as a flat field.

10. The method of claim 8 wherein said light source is at least one LED.

11. The method of claim 1 further comprising the step of processing data stored in said microprocessor to emulate fluorescence emissions.

12. The method of claim 1 further comprising the step of processing data stored in said microprocessor to emulate the ratio of fluorescence emissions of two or more wavelengths.

13. The method of claim 1 further comprising the step of processing data stored in said microprocessor to emulate at least one ratio of fluorescence emissions of a single wavelength at at least two points of time.

14. The method of claim 1 further comprising the step of characterization of a microscope light collection path and illumination path.

15. The method of claim 14 further comprising the step of said characterization being by measuring and recording optical output.

16. The method of claim 15 further comprising the step of originating said optical output from said at least one light source.

17. The method of claim 16 wherein said at least one light source is recessed within the wall of, and in visual communication with, said chamber.

18. The method of claim 16 wherein one of said at least one light source is said microscope, said microscope directing light through said light aperture to be monitored by said photosensor.

19. The method of claim 1 further comprising the step of said microprocessor monitoring gradient shifts in fluorescence intensity and ratios of intensity at one or more wavelengths.

20. The system of claim 1 further comprising the step of determining the transient response of recording equipment comprises the steps of

a. entering width and amplitude of desired light pulses,

b. generating said light pulses

c. sending signals of said generated light pulses to an output device,

thereby enabling said output device to compare the timing relationship between said generated light pulses with light pulses received by said recording device.