Honeywell International Inc.

Terry Marta

James Allen Cox

Barrett E Cole

Fouad Nusseibeh

Bernard S Fritz

Adam Dewey McBrady

Rodney Royston Watts

Antony Leighton Phillips

Robert E Higashi

Michael L Rhodes

Rodney H Thorland

Carl David Anderson

Carl Anderson

Embodiments relate generally to systems and methods for filtering unwanted wavelengths from an IR detector. In some embodiments, it may be desired to remove or reduce the wavelengths absorbed by water, to reduce the effects of water on the detection of the target gas. In some embodiments, a filter glass may be used in the IR detector, wherein the filter glass comprises one or more materials that contain hydroxyls in their molecular structure, and wherein the spectral absorption properties of the filter glass are operable to at least reduce wavelengths of light absorbed by water from the optical, thereby reducing the IR detector's cross sensitivity to water.

Use of selected glass types and glass thicknesses in the optical path to remove cross sensitivity to water absorption peaks

A non-dispersive photoacoustic gas detector includes an infrared light source, a first closed chamber, a first acoustic sensor in fluid communication with the first closed chamber, a second closed chamber, and a second acoustic sensor in fluid communication with the second closed chamber. The first closed chamber comprises a plurality of windows that are substantially transparent to infrared light from the infrared light source. The second closed chamber comprises at least one window that is substantially transparent to infrared light from the infrared light source, and the first closed chamber is arranged in series with the second closed chamber between the infrared light source and the second closed chamber.

Gas detector with normalized response and improved sensitivity

An illustrative cavity ring down gas sensor includes an optical cavity for receiving a gas to be detected and at least two electromagnetic radiation sources. The first electromagnetic radiation source may emit a first beam of light having a wavelength corresponding to an absorption wavelength of the gas to be detected, and the second electromagnetic radiation source may emit a second beam of light having a second wavelength that is off of an absorption wavelength of the gas to be detected. The first beam of light may detect a cavity ring down time decay, which is related to the concentration of the gas to be detected. The second beam of light may be used to detect a baseline cavity ring down time decay, which may be used to help increase the accuracy of the sensor by, for example, helping to compensate the concentration of the gas detected by the first beam of light for sensor variations caused by, for example, sensor age, temperature or pressure changes, and/or other conditions.

Multiple wavelength cavity ring down gas sensor

A cavity ring down gas sensor may include a radiation source emits an input beam of light having a wavelength corresponding to an absorption line of a gas to be detected. The input beam of light is coupled into an optical cavity to amplify an internal beam of light that is reflected about the optical cavity. An optical element is disposed in the optical cavity at an angle close to, but not at, the Brewster's angle to reflect a relatively small portion of the internal beam of light to a detector. When a specified light intensity is reached in the optical cavity, the input beam of light may be prevented from entering the optical cavity, and a cavity ring down time decay may be measured. The cavity ring down time decay may be related to the gas concentration of a gas to be detected in the optical cavity.

Beam intensity detection in a cavity ring down sensor

A micro discharge device (MDD) capable of low voltage discharges in a variety of carrier gases for detection and/or ionization includes a sample introduction capillary having a first open end connected to a gas system and a second open end connected to a cylinder comprising a high dielectric constant material. A high voltage electrode can be placed in close proximity to the outer diameter of the cylinder and at a close linear distance to the second open end of the sample introduction capillary. A region can be formed inside the cylinder between the second end of the sample introduction capillary and the high voltage electrode wherein discharge can be located. An optical emission collector can be located through the flow manifold to a receiving location near the high voltage electrode within a region from inside the cylinder between the high voltage electrode and the manifold.

Micro discharge device capable of low voltage discharges in a variety of carrier gases for detection and/or ionization

A micro discharge device (MDD) ionizer and a method for fabricating the MDD ionizer are disclosed. The MDD ionizer includes a dielectric barrier having a first open end connected to an electrically conductive capillary tube and a second open end connected to a sample collection capillary tube. A circular high voltage electrode can be positioned around the dielectric barrier in close linear proximity to the conductive capillary tube and sealed by a non-conductive epoxy. A plasma discharge can be formed in a flow path through the dielectric barrier when an AC potential is applied between the high voltage electrode and the electrically conductive capillary tube utilizing an electronic controller. Such a plasma discharge in the flow path of the sample achieves soft ionization of gaseous sample molecules. The high pressure region generally occurs in the plasma region (where the ionization occurs). The ions thus are drawn (i.e., pushed or pulled) toward the high vacuum region located downstream where the detector(s) can be located.

Micro discharge device ionizer and method of fabricating the same

A system having a multiple-mirror ring-down cavity with one mirror where light may be input into the cavity and light from the cavity may be detected. A valve may permit light to enter or not to enter the cavity. An amplifier may be connected to a detector for detecting light from the cavity. The amplifier may be off or set at a low gain when light is entering the cavity and be on at a medium or high gain at a time when light is not entering the cavity.

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White Bear Lake, MN, United States of America

Terry Marta