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Cavity ring-down spectroscopy device

A detector and cavity technology, applied in the field of cavity ring-down spectrometry detectors, can solve problems such as difficulty in determining when light is coupled, disturbing cavity light measurement, etc.

Active Publication Date: 2015-04-22
HONEYWELL INT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the reflected portion of the input light directly coincides with the ambient light, the former can disturb the measurement of cavity light and make it difficult to determine when light couples into the cavity or does not reach the cavity and is only reflected onto the detector

Method used

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Embodiment Construction

[0008] In the following description, reference is made to the accompanying drawings which form a part hereof, and in which are shown by way of illustration specific embodiments in which certain embodiments may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention, and it is to be understood that other embodiments may be utilized and structural, logical, and electrical changes may be made without departing from the scope of the invention. Accordingly, the following description of the exemplary embodiments is not to be taken in a limiting sense, the scope of the invention being defined by the appended claims.

[0009] The functions or algorithms described herein can be implemented in software or a combination of software and human-implemented programs in one embodiment. Software may include computer-executable instructions stored on a computer-readable medium, such as a memory or other type of storage devi...

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Abstract

A cavity ring-down spectroscope includes a ring-down cavity [110]. A trigger detector [135] is optically coupled within the ring-down cavity [110] to generate a signal to indicate a desired radiation level in the ring-down cavity [110]. A controller [150] is coupled to the trigger detector [135] to control light provided to the ring-down cavity [110]. A ring-down time may then be measured.

Description

technical field [0001] The present invention relates to cavity ring-down spectroscopy detectors. Background technique [0002] Cavity ring-down spectroscopy (CRDS) systems include a cavity that reflects light within itself to provide a long path through the sample. The decay of light intensity from the cavity over time can be used to determine the intensity of sample absorption. From the known absorption cross-section at the probe wavelength, the cavity loss from the sample measured by the ring-down time, measurements of the sample, such as gas concentration, can be obtained. While having both input and output through a single mirror has clear benefits in terms of light intensity, some systems tune the path length by using piezo-actuated tuning mirrors to resonate the cavity with the laser wavelength. Since the reflected portion of the input light directly coincides with the ambient light, the former can disturb the measurement of cavity light and make it difficult to dete...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/01G01N21/31
CPCG01J3/42
Inventor B·E·科尔J·A·科克斯T·M·马塔R·H·索尔兰
Owner HONEYWELL INT INC
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