Claims
- 1. An internal calibration system for use in calibrating a photodetection head in a luminometer, said system comprising:
- means for moving said photodetection head between a position for detecting sample and a position for calibration
- means defining a chamber having upper and lower regions, and an upper opening in said upper region through which a calibrating intensity of light is received when said photodetection head is in the position for calibration;
- a light source in the chamber's lower region for emitting light thereinto;
- a photosensor in said chamber's lower region for receiving light emitted therein by the light source;
- circuit means for regulating the intensity of the light source based on light measurements by the photosensor;
- temperature control means for maintaining said chamber at a preselected temperature;
- aperture means disposed between said upper and lower regions and beneath said upper opening for reducing light intensity in the upper region with respect to the lower region, and
- diffusion means adjacent said upper opening and above said aperture means for scattering light emitted from said light source into the upper region through said aperture means
- wherein said aperture means and said diffusion means provide for said photodetection head to receive said calibrating intensity of light which is a diffuse reduced light intensity as compared to the intensity of light emitted by said light source.
- 2. The system of claim 1, wherein said light source and photosensor are positioned on opposing side walls of said chamber.
Parent Case Info
This application is a divisional application of U.S. Ser. No. 08/411,445 filed 28 Mar. 1995, which is a divisional application of U.S. Ser. No. 07/878,829 filed 5 May 1992, now U.S. Pat. No. 5,401,465.
US Referenced Citations (12)
Divisions (2)
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Number |
Date |
Country |
Parent |
411445 |
Mar 1995 |
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Parent |
878829 |
May 1992 |
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