US 7,099,003 B2Granted

Spectroscopic systems and methods

AssigneeDelta Search Labs, Inc.

InventorsVidi A. Saptari, Kamal Youcef-Toumi

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Abstract

The present invention relates to spectroscopic methods and systems for collecting electromagnetic radiation from an object using a continuously-spinning wavelength-selecting (CSWS) device, e.g., an interference filter(s) or grating. One embodiment of the invention provides a spectroscopic system for collecting electromagnetic radiation from a target. The spectroscopic system has at least one beam of electromagnetic radiation that interacts with the target. The system includes a continuously spinning wavelength-selecting (CSWS) device, e.g., a continuously spinning interference filter/grating driven by a DC motor, in the path of the at least one beam. The device filters the radiation with regard to wavelength to produce filtered radiation. The system further includes at least one detector in the path of the at least one beam for detecting the filtered radiation.

Claims28

Dependent claims

A spectroscopic system for collecting electromagnetic radiation from a target, the spectroscopic system comprising:

a source of a primary beam of electromagnetic radiation;
a continuously spinning wavelength-selecting device in the path of the primary beam, the device operative to pass only a restricted spectral band of the electromagnetic radiation to produce filtered radiation, the device comprising
a motor;
a filter coupled to the motor, the filter being adapted to spin about an axis that is substantially perpendicular to the primary beam;
and
a rotational velocity control in communication with the motor and operative to use a rotational velocity signal to control the rotational velocity of the filter;
a beamsplitter in the path of the primary beam and operative to split the primary beam into a first subordinate beam and a second subordinate beam;
a target cell in the path of the first subordinate beam, the target cell adapted to interact with a portion of the filtered radiation to produce filtered target radiation;
and
a reference cell in the path of the second subordinate beam adapted to interact with a portion of the filtered radiation to produce filtered reference radiation;
a first detector in the path of the first subordinate beam and operative to detect the filtered target radiation and to produce detected target radiation information;
a second detector in the path of the second subordinate beam and operative to detect the filtered reference radiation and to produce detected reference radiation information;
and
a processing device in communication with the first and second detectors and operative to process the detected target radiation information and the detected reference radiation information and to produce processed target information.

11 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/840,686Filed 6 May 2004 · us provisional application
Priority: 9 May 2003
Published: US 2005/0012925 A120 Jan 2005
Granted: 29 Aug 2006
Term ends: Not estimatedThe source records don’t support an estimate.

Classification13 codes

G01J 3/06
Details: scanning arrangements arrangements for order-selection
G01J 3/2889
Investigating the spectrum: rapid scan spectrometers; Time resolved spectrometry
G01J 3/42
Investigating the spectrum: absorption spectrometry; Double beam spectrometry; Flicker spectrometry; Reflection spectrometry
G01J 3/433
Absorption spectrometry; Double beam spectrometry; Flicker spectrometry; Reflection spectrometry: modulation spectrometry; Derivative spectrometry