Standard device for origin of light absorbance and method of using the same

• US 7,675,623 B2
• Filed: 08/27/2008
• Issued: 03/09/2010
• Est. Priority Date: 03/12/2008
• Status: Expired due to Fees

• Current Assignee: Shimadzu Corporation
• Original Assignee: Shimadzu Corporation
• Inventors: Kohno, Satoru, Tsuneishi, Shoichi
• Primary Examiner(s): Chowdhury; Tarifur
• Assistant Examiner(s): Stock, Jr.; Gordon J
• Application Number:
  US12/199,048
• Publication Number:
  US 20090231585A1
• Time in Patent Office: 559 Days
• Field of Search: None
• US Class Current: 356/432
• CPC Class Codes: G01N 21/4785 Standardising light scatter apparatus; Standards therefor
• CPC Class Codes: G01N 21/4795 spatially resolved investigating of object in scattering medium in vivo A61B

Abstract

A device for origin of light absorbance used in an optical measuring instrument for measuring light absorption characteristics of a light diffusion sample. The device includes a light transmission terminal configured to irradiate a measurement light onto the light diffusion sample at a point of incidence of the light diffusion sample and a light diffusion plate through the interior of which the measurement light can be diffused and transmitted. A light receiving terminal is configured to receive the measurement light from the light diffusion sample for measurement at a point of detection of the light diffusion sample that is separate from the point of incidence. Optionally, the device can include a cleaning unit that cleans the light transmission terminal and light receiving terminal.

Claims

1. An absorption standard device that provides a standard for an origin of light absorbance, comprising:

a light diffusion plate through the interior of which a measurement light can be diffused and transmitted; and

a cleaning unit that cleans a light transmission terminal and a light receiving terminal of an optical measuring instrument.

2. The absorption standard device for an origin of light absorbance according to claim 1 wherein the cleaning unit includes

a cleaning tank formed by a plurality of side walls and a bottom surface, the bottom surface including the light diffusion plate,

a cleaning solution that is contained within the cleaning tank, and

an ultrasonic transducer that generates ultrasonic vibrations in the cleaning solution.

3. The absorption standard device for an origin of light absorbance according to claim 1 wherein the cleaning unit includes a fabric laminated on a surface of said light diffusion plate.

4. The absorption standard device for an origin of light absorbance according to claim 3 wherein the laminated fabric is rotatable relative to the light transmission terminal and the light receiving terminal.

5. A method of using a device for an origin of light absorbance used in an optical measuring instrument for measuring light absorption characteristics of a light diffusion sample, the method comprising:

filling a cleaning tank at least partially with a cleaning solution, the cleaning tank formed by a plurality of side walls and a bottom, the bottom including a surface of a light diffusion plate;

immersing in the cleaning solution a light transmission terminal and a light receiving terminal;

generating ultrasonic vibrations in the cleaning solution using an ultrasonic transducer so as to remove contaminations from the light transmission terminal and the light receiving terminal;

receiving an irradiated measurement light from the light transmission terminal at a point of incidence of the light diffusion sample and through the light diffusion plate, the light diffusion plate diffusing and transmitting the measurement light;

producing a reflected measurement light reflected from a point of detection of the light diffusion sample, the point of detection being separate from the point of incidence; and

measuring at said light receiving terminal the measurement light irradiated from said light transmission terminal into the interior of the light diffusion plate, through the interior of said light diffusion plate, and reflecting from and exiting to the exterior of the light diffusion plate.

6. A method of using a device for an origin of light absorbance used in an optical measuring instrument for measuring light absorption characteristics of a light diffusion sample, the method comprising:

filling a cleaning tank with a cleaning solution, the cleaning tank formed by a plurality of side walls and a bottom, a bottom including a surface of a light diffusion plate;

immersing in the cleaning solution a light transmission terminal and a light receiving terminal;

generating ultrasonic vibrations in the cleaning solution using an ultrasonic transducer so as to remove contaminations from the light transmission terminal and the light receiving terminal;

rotating a drive mechanism configured to rotate a laminar body of a fabric and a light diffusion plate;

bringing the light transmission terminal and the light receiving terminal into contact with a fabric surface not laminated to the light diffusion plate during the rotation of the drive mechanism;

receiving an irradiated measurement light from the light transmission terminal at a point of incidence of the light diffusion sample and through the light diffusion plate, the light diffusion plate diffusing and transmitting the measurement light;

producing a reflected measurement light reflected from a point of detection of the light diffusion sample, the point of detection being separate from the point of incidence; and

measuring at said light receiving terminal the measurement light irradiated from said light transmission terminal into the interior of the light diffusion plate, through the interior of said light diffusion plate, and reflecting from and exiting to the exterior of the light diffusion plate.