Title:
【発明の名称】高温度の示差屈折率検出装置
Document Type and Number:
Japanese Patent JP2002538424
Kind Code:
A
Abstract:
A differential refractometry apparatus that maintains optimal optical alignment of components while accurately providing differential refractometry measurements at elevated temperatures. The differential refractometry apparatus has a first thermal zone, a thermal isolation zone and a second thermal zone. The first thermal zone is configured to be located in an oven and exposed to higher temperatures. The thermal isolation zone is located adjacent to the first thermal zone and acts as a barrier to the conduction of heat from the first thermal zone into the second thermal zone. The second thermal zone is at a relatively lower temperature than the first thermal zone and its temperature is regulated using a thermal electric cooler located at its base. A flow cell, a mirror which reflects the incoming light beam, and an imaging lens are located in the first thermal zone. An LED and a photodiode detector are located in the second thermal zone and are encased in thermally stable blocks with low coefficients of thermal expansion. The LED sends a light beam up through the thermal isolation zone and into the first thermal zone. The light beam passes through the sample and gets reflected by the mirror. The light beam passes through the sample a second time. The light beam then passes through an imaging lens before traveling back to the photodiode in the second thermal zone. In this manner the optimal optical geometry is preserved while allowing analyses to be conducted with the sample at elevated temperatures.
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Inventors:
Neil Bellamino, Almeida
Decorated, Jose Lewis
Decorated, Jose Lewis
Application Number:
JP2000601409A
Publication Date:
November 12, 2002
Filing Date:
February 25, 2000
Export Citation:
Assignee:
Waters Investments Limited
International Classes:
G01N21/41; (IPC1-7): G01N21/41; G01N21/01; G01N21/05
Domestic Patent References:
| JPH0555052U | 1993-07-23 | |||
| JPH05172746A | 1993-07-09 | |||
| JPS6327733A | 1988-02-05 | |||
| JPH05172747A | 1993-07-09 | |||
| JPH07318489A | 1995-12-08 | |||
| JPH09145617A | 1997-06-06 | |||
| JPH09126997A | 1997-05-16 |
Attorney, Agent or Firm:
Kazuo Shamoto (5 outside)