Integrated Embedded Processor Based Laser Spectroscopic Sensor
First Claim
1. A method comprising:
- generating a first waveform at a first modulation frequency using a direct digital synthesis (DDS) algorithm; and
dividing the first waveform into a plurality of second waveforms at a plurality of second modulation frequencies using a plurality of frequency dividers.
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Abstract
A novel low-power and compact laser spectroscopic sensor is described herein. Embodiments of the disclosed sensor utilize state-of-the-art microprocessors and digital processing techniques to reduce power consumption and integrate functions into a small device. In particular, novel software methods are disclosed which allow the use of low-power microprocessors which draw no more than about 0.02 W of power. Such low-power enables long battery life and allows embodiments of the sensor to be used in portable applications. In addition, the system architecture and methods described in this disclosure allow a single integrated embedded processor to control all the subsystems necessary for a laser spectroscopic sensor further reducing sensor size and power consumption. In addition, a power efficient method of calibrating a photoacoustic laser spectroscopic sensor is disclosed.
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Citations
21 Claims
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1. A method comprising:
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generating a first waveform at a first modulation frequency using a direct digital synthesis (DDS) algorithm; and dividing the first waveform into a plurality of second waveforms at a plurality of second modulation frequencies using a plurality of frequency dividers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An apparatus comprising:
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a light source; a processor; and a thermoelectric module coupled to the light source and the processor, wherein the processor is a fixed point digital signal processor, and wherein the processor is configured to use a control loop to control the thermoelectric module. - View Dependent Claims (11, 12, 13, 14, 15)
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16. An apparatus comprising:
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a light source; and a processor configured to implement a method comprising; dividing a first waveform into at least a second waveform having a lower frequency; and filtering the second waveform to create a sinusoid; attenuating the sinusoid using control signals from the processor; and controlling a current fed to the light source using the attenuated sinusoid, thereby controlling a modulation of a light emitted from the light source. - View Dependent Claims (17, 18, 19, 20, 21)
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Specification