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Exploiting constructive interference from ambient conditions

A technology of ambient conditions, ambient light, used in applications, electrical components, instruments, etc.

Active Publication Date: 2017-06-09
TEXAS INSTR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The problems mentioned above are largely addressed by systems and methods that employ constructive interference from environmental conditions

Method used

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  • Exploiting constructive interference from ambient conditions
  • Exploiting constructive interference from ambient conditions
  • Exploiting constructive interference from ambient conditions

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Embodiment Construction

[0012] The following discussion is directed to various embodiments of the invention. Although one or more of these embodiments may be preferred, the disclosed embodiments should not be read or otherwise used to limit the scope of the disclosure, including the claims. Furthermore, those skilled in the art will appreciate that the following description has broad application, and that any discussion of an embodiment is meant to be exemplary of that embodiment only, and is not intended to imply that the scope of the present disclosure, including the claims, is limited to that embodiment. Example.

[0013] Optical absorption spectroscopy is a technique used to measure the absorption of light due to the interaction of light with a target object. For example, light can be emitted and reflected back by a target. During this process, some light is absorbed by the target and the remaining light is reflected back by the target and received by the optical receiver. Optical receivers re...

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Abstract

An optical system (104) includes an optical illumination source (202), an optical receiver (204), a correlation determination circuit (206), and an ambient condition control circuit (208). The optical illumination source (202) is configured to emit a light (116) in the direction of a target object. The optical receiver (204) is configured to receive a combined optical signal (114) that includes an ambient light component combined with an interrogation component. The correlation determination circuit (206) is configured to compare the combined optical signal (114) with an ambient light signal (112) to identify a correlation factor. The ambient condition control circuit (208) is configured to compare the correlation factor to a low correlation threshold value and a high correlation threshold value, and, based on the correlation factor exceeding the low threshold value and being less than the high correlation threshold value, cancel the ambient light component from the combined optical signal (114) to produce an interrogation signal (118) including the interrogation component.

Description

Background technique [0001] Optical absorption spectroscopy is a technique used to measure the absorption of light due to the interaction of light with a target object. For example, light can be emitted and reflected back by a target. During this process, some light is absorbed by the target and the remaining light is reflected back by the target and received by the optical receiver. For example, in photoplethysmography (PPG), emitted light is reflected back by the user's body and received by a light detector. Different levels of blood oxygen absorb different wavelengths of light. Thus, the signal representing light reflected back by the target object (in this example, the user's body) without being absorbed by the target object may be a function of pulsatile arterial blood, non-pulsatile arterial blood, venous blood, and other tissue. By analyzing the reflected signal, different parameters can be determined. Continuing with the PPG example, the user's heart rate can be de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31G01N21/01H05B44/00
CPCG01N21/01G01N21/31G01N2201/068H05B45/12A61B5/7203A61B5/02416A61B5/14551H05B47/11Y02B20/40H05B47/16
Inventor S·纳拉亚南S·拉马斯瓦米A·波利A·沙玛
Owner TEXAS INSTR INC