Background acoustic signal suppression in photoacoustic detector

A background sound wave and background technology, which is applied in the field of background sound signal suppression in photoacoustic detectors, can solve problems such as clumsiness and high cost, limit the market acceptance of miniaturized devices, and achieve the effect of improving sensitivity

Inactive Publication Date: 2007-12-26
KONINKLIJKE PHILIPS ELECTRONICS NV
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Problems solved by technology

[0007] Half the volume of the gas chamber is dedicated to background signal suppression, similar to the previous solutions for eliminating int

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  • Background acoustic signal suppression in photoacoustic detector

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Embodiment Construction

[0019] FIG. 1 shows an exemplary embodiment of a photoacoustic sensor 100 of the present invention. Sensor 100 includes a cavity 102 containing a gas sample 116 . A gas sample 116 is introduced into the chamber 102 through an inlet pipe 124 , and the sample 116 is discharged from the chamber 102 through an exhaust pipe 104 . In this embodiment, the gas sample 116 contains at least one component, the presence and / or composition of which can be analyzed in part by the sensor 100 through the light absorption of the component. In this embodiment, the components are selected such that an abnormally high, ie, above normal, concentration of the component to be detected is indicative of a medical condition, eg, malaise, disease, organ rejection, respiratory crisis, and the like. The device of the present invention is a non-invasive tool that assists physicians in making a diagnosis by providing accurate patient body data to the physician. The following methods are used to detect abn...

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Abstract

The present invention relates to a photo-acoustic device (100) for photo-acoustic analysis of a sample such as exhaled human breath.The device includes a sample cell cavity (102) for containing the sample (116), a first light source (130) outside the sample cell cavity for emitting a first modulated light beam (114) at a wavelength in an absorbing range of the searched component. The first light beam is led into the cavity through a transparent cavity wall (106). The searched gas component absorbs the first light beam and first acoustic waves are thus generated which are picked up by the microphone (110). The microphone also picks up background acoustic waves caused by the laser light beam going trough the cavity wall. The device is further equipped with a noise cancellation system (120, 122) that generates a second set of acoustic waves in anti-phase with the background acoustic waves.

Description

technical field [0001] The present invention relates to the detection of solution sample components by photoacoustic sensors. The invention specifically relates to the non-invasive analysis of gaseous, solid or liquid substances rejected by the human body in gas detection in industrial production processes, environmental gas detection and in the medical field. One main application is the non-invasive analysis of exhaled air. Background technique [0002] Breath testing is rapidly developing into an exciting medical technology. Component examination in exhaled breath is a non-invasive, patient-friendly, and low-cost medical procedure. Typical examples of breath testing include asthma monitoring, breath alcohol monitoring, gastrointestinal upset or acute organ rejection checks, and the first phase clinical trials show that it can be applied to breast and lung cancer pre-screening. [0003] Various solutions are available for diagnostic testing of breath components. If the d...

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Application Information

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IPC IPC(8): G01N21/17
CPCG01N33/0037G01N2021/1704G01N33/497G01N21/1702Y02A50/20
Inventor H·范克斯特伦
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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