Laser Doppler Blood Flow Meter Oscillation Counting
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Solution Overview
Problem
Measurement apparatuses for laser Doppler blood flow meters require high-cost and power-consuming DSPs for calculations like FFT and DFT, hindering power saving and cost reduction.
Innovation Solution
A measurement apparatus that uses a light source to emit coherent light, a light reception section to detect signals, and a measurement section to count oscillations within a certain time period, eliminating the need for complex calculations by focusing on the number of oscillations in the detected signal, thereby reducing power consumption and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If DSP or IC is used to carry out calculations such as FFT and DFT, then measurement precision is improved, but device complexity and power consumption increase
Solution Approach 1:
The patent extracts and eliminates the complex calculation components (DSP/IC) from the measurement system. Instead of using digital signal processing for FFT and DFT calculations, the invention directly measures the number of oscillations in the detected signal, removing the need for complex computational hardware while maintaining measurement capability.
Solution Approach 2:
The patent replaces the electronic/computational system (DSP/IC-based calculation system) with a simpler optical/detector-based system. By directly counting oscillations in the detected light signal rather than performing complex digital transformations, the invention substitutes a simpler physical measurement approach for a complex computational approach.
2Measurement precision
If DSP or IC is used to carry out calculations such as FFT and DFT, then measurement precision is improved, but power consumption increases
Solution Approach 1:
The patent extracts and removes the power-intensive DSP/IC components from the system. By eliminating the need for complex digital signal processing calculations, the invention directly reduces power consumption while maintaining the ability to measure blood flow through simple oscillation counting.
Solution Approach 2:
The patent replaces the energy-consuming electronic calculation system with a low-power optical detection and counting system. By measuring oscillations directly in the detected signal rather than performing computationally intensive transformations, the invention substitutes a low-power physical measurement approach for a high-power computational approach.
3Measurement precision
If DSP or IC is used to carry out calculations, then measurement capability is improved, but cost increases
Solution Approach 1:
The patent extracts and eliminates expensive DSP/IC components from the measurement system. By removing the need for complex digital signal processing hardware, the invention significantly reduces manufacturing costs while maintaining measurement capability through simpler oscillation counting circuitry.
Solution Approach 2:
The patent replaces expensive, complex DSP/IC components with simpler, more affordable circuitry designed specifically for oscillation counting. The invention uses basic electronic components and straightforward measurement circuits instead of costly high-performance processors, making the system more economical while adequate for the measurement task.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution achieves reduced power consumption and cost while maintaining accurate blood flow measurements by counting oscillations in the detected signal, eliminating the need for high-performance calculators and AD converters, and is applicable to various measurement targets beyond human blood flow.
Implementation Method 1
a light reception section that receives the light emitted from the light source by way of a measurement target and detects a signal proportional to the received light
Implementation Method 2
A technology called a laser Doppler blood flow meter that non-invasively measures subcutaneous blood flow rate by shining coherent light onto a human skin and analyzing backscattered light thereof
Data Source
AI summary
The present technology relates to a measurement apparatus and a measurement method that realize reduction in power consumption while at the same time ensuring reduction in cost. Provided is a measurement apparatus that includes a light source, a light reception section, and a measurement section. The light source emits at least partially coherent light. The light reception section receives the light emitted from the light source by way of a measurement target and detects a signal proportional to the received light. The measurement section measures the number of oscillations included in the signal detected by the light reception section within a certain time period. For example, the present technology can be applied to a measurement apparatus measuring a blood flow of a human body.