PHOTOPLETHYSMOGRAPHIC DEVICE AND METHODS THEREFORE
First Claim
1. An optical measurement (OM) device, the device comprising:
- an illumination assembly configured to output light from two or more light sources to a surface portion of a user for measurement;
a detection assembly configured to detect the output light from the two or more light sources reflected from said surface portion of the user as a signal;
an amplifier module coupled to the detection assembly configured to apply a gain to an alternating-current component of the signal; and
a microcontroller coupled to the detection assembly configured to assess a direct-current voltage level of the signal,wherein the microcontroller is configured to control the light output at the illumination assembly based on said assessing the direct-current voltage level such that the alternating-current component of the signal is within a saturation level, upon the amplifier module applying the gain, andwherein the microcontroller is configured to select a gain value for said applying the gain based on said assessing the direct-current voltage level.
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Accused Products
Abstract
An optical measurement device and a method for optical measurement are provided. The device comprises an illumination assembly configured to output light to a surface portion of a user for measurement; a detection assembly configured to detect the output light reflected from said surface portion of the user as a signal; an amplifier module coupled to the detection assembly configured to apply a gain to an AC component of the signal; a microcontroller coupled to the detection assembly configured to assess a DC voltage level of the signal; wherein the microcontroller is configured to control the light output at the illumination assembly based on said assessing the DC voltage level; and further wherein the microcontroller is configured to select a gain value for said applying the gain based on said assessing the DC voltage level. Specific embodiments of the device relate to a photoplethysmograph or pulse oximeter.
20 Citations
20 Claims
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1. An optical measurement (OM) device, the device comprising:
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an illumination assembly configured to output light from two or more light sources to a surface portion of a user for measurement; a detection assembly configured to detect the output light from the two or more light sources reflected from said surface portion of the user as a signal; an amplifier module coupled to the detection assembly configured to apply a gain to an alternating-current component of the signal; and a microcontroller coupled to the detection assembly configured to assess a direct-current voltage level of the signal, wherein the microcontroller is configured to control the light output at the illumination assembly based on said assessing the direct-current voltage level such that the alternating-current component of the signal is within a saturation level, upon the amplifier module applying the gain, and wherein the microcontroller is configured to select a gain value for said applying the gain based on said assessing the direct-current voltage level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for optical measurement, the method comprising:
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outputting light from two or more light sources to a surface portion of a user for measurement; detecting the output light from the two or more light sources reflected from said surface portion of the user as a signal; assessing a direct-current voltage level of the signal; controlling the light output at the illumination assembly based on said assessing the direct-current voltage level; selecting a gain value based on said assessing the direct-current voltage level; and applying a gain using the selected gain value to an alternating-current component of the signal, wherein said controlling the light output at the illumination assembly based on said assessing the direct-current voltage level is such that the alternating-current component of the signal is within a saturation level, upon said applying the gain. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A non-transitory computer readable data storage medium having stored thereon computer code means for instructing a microcontroller of an optical measurement device to execute a method for an optical measurement, the method comprising:
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outputting light from two or more light sources to a surface portion of a user for measurement; detecting the output light from the two or more light sources reflected from said surface portion of the user as a signal; assessing a direct-current voltage level of the signal; controlling the light output at the illumination assembly based on said assessing the direct-current voltage level; selecting a gain value based on said assessing the direct-current voltage level; and applying a gain using the selected gain value to an alternating-current component of the signal, wherein said controlling the light output at the illumination assembly based on said assessing the direct-current voltage level is such that the alternating-current component of the signal is within a saturation level, upon said applying the gain. - View Dependent Claims (20)
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Specification