Spectrophotometer with electronic temperature stabilization
US5739905A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 26, 1997 |
| Grant date | Apr 14, 1998 |
| Priority date | — |
| Expiry date | Feb 26, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J3/28
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In order to preclude unreliable or inaccurate spectrophotometric measurements which can be caused by thermal effects (expansion/contraction) of components of the spectrophotometer, such as the dispersive element, the arm or mounting for changing the orientation of the element to scan the spectrum and produce spectral measurements, the element, and also displacement of the photodetector, lenses and other optical elements which can caused thermal effects, and also to reduce temperature-related errors in the photodetector or other electronics of the spectrophotometer, a temperature sensor is disposed in thermally coupled relationship within the spectrophotometer housing. A motor, which is coupled to the arm to change the orientation of the element and to the motor controller, is programmed to utilize the motor as a heat source in response to the temperature of the spectrophotometer detected by the sensor when the motor is not actuating the element grating to provide spectral measurements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.