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Automated Power Control for Mobile Laser Speckle Imaging System.
Hyeoungho Bae1, Yu-Chih Huang, Owen Yang
1Department of Electrical and Computer Engineering, University of California, Irvine, Irvine, CA, 92697 USA.
IEEE Embedded Systems Letters
|November 6, 2010
Summary
This study introduces a new automated power control circuit for mobile Laser Speckle Imaging (LSI) systems. The pulsed laser operation significantly reduces power consumption and heat, enabling accurate blood perfusion measurements in a compact, stable device.
Area of Science:
- Biomedical Engineering
- Optical Imaging
- Medical Devices
Background:
- Laser Speckle Imaging (LSI) offers high temporal resolution for blood perfusion measurement.
- Miniaturization of LSI for mobile applications faces challenges in power consumption and heat dissipation.
- Maintaining detection accuracy is crucial for mobile LSI instrumentation.
Purpose of the Study:
- To develop a mobile Laser Speckle Imaging system with reduced power consumption and heat.
- To propose a novel automated power control (APC) circuit for pulsed laser operation in LSI.
- To ensure system stability and maintain detection accuracy in a compact LSI device.
Main Methods:
- Implementation of pulsed laser operation synchronized with camera shutter.
- Development and validation of a new automated power control (APC) circuit.
- System evaluation using Pspice simulations and a prototype APC board with a commercial camera.
Main Results:
- Pulsed laser operation significantly reduces power consumption compared to continuous wave.
- Synchronized pulsing maintains raw speckle image quality similar to conventional LSI.
- Reduced power consumption leads to lower operating temperatures and increased system stability.
Conclusions:
- The proposed APC circuit effectively enables pulsed laser operation for mobile LSI.
- This approach addresses key challenges in developing compact, power-efficient LSI instrumentation.
- The validated solution facilitates the creation of stable and accurate mobile blood perfusion monitoring devices.
