ATR Crystal Spectrum Correction via Pressure Feedback
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Solution Overview
Problem
Existing devices face challenges in maintaining a constant contact pressure between attenuated total reflectance (ATR) crystals and a biological body during light absorption spectrum measurement, leading to variations in light absorption intensity.
Innovation Solution
A light absorption spectrum correction device that includes a pressure sensor to detect contact pressure, a spectrum detector and analyzer to measure and correct the spectrum based on intensity and wavelength, and a spectrum correction mechanism to adjust the spectrum according to the detected pressure, ensuring consistency across varying contact pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If constant pressure is applied to maintain measurement accuracy, then light absorption spectrum precision is improved, but ease of operation deteriorates due to difficulty in maintaining constant contact pressure on biological bodies
Solution Approach 1:
The system employs a pressure sensor to detect contact pressure in real-time and feeds this information back to a spectrum correction device. The correction device then adjusts the light absorption spectrum based on the detected pressure, creating a closed-loop feedback system that automatically compensates for pressure variations without requiring manual intervention to maintain constant pressure.
Solution Approach 2:
The system changes the parameter being measured from raw light absorption intensity to pressure-corrected light absorption spectrum. By introducing pressure as a correction parameter, the system transforms the measurement process to account for pressure variations, allowing accurate measurements even when contact pressure is not constant.
2Ease of operation
If contact pressure is allowed to vary for ease of operation, then ease of operation is improved, but measurement precision deteriorates due to variations in light absorption intensity
Solution Approach 1:
The pressure sensor continuously monitors contact pressure and provides real-time feedback to the spectrum correction device. This feedback mechanism enables the system to automatically compensate for pressure variations, maintaining measurement precision even when contact pressure is allowed to vary for ease of operation.
Solution Approach 2:
The system replaces the mechanical requirement for constant manual pressure application with an automated optical-electrical correction system. Instead of relying on mechanical pressure control, the system uses pressure sensing and computational correction to achieve accurate measurements, substituting mechanical precision requirements with sensor and algorithm-based solutions.
3Measurement precision
If pressure sensor and correction mechanism are added to compensate for pressure variations, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The pressure sensor serves multiple functions: it detects contact pressure for correction purposes, provides feedback signals for spectrum adjustment, and enables the system to operate across a range of pressure conditions. This multi-functionality justifies the addition of the pressure sensing capability despite the increased complexity.
Solution Approach 2:
The spectrum correction device acts as an intermediary component that bridges the pressure sensor and the spectrum measurement system. It receives pressure data from the sensor, processes the correction algorithms, and outputs corrected spectrum data, thereby managing the complexity through modular architecture rather than direct integration of all components.
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 device effectively reduces variations in light absorption spectrum due to contact pressure changes, providing accurate and consistent measurements by correcting the spectrum to fit within a reference range, thereby improving the reliability of biosignal measurement.
Implementation Method 1
an attenuated total reflectance (ATR) crystal layer configured to contact a subject and provide an optical passage along which the light emitted by the light source travels to the subject
Implementation Method 2
a pressure sensor configured to detect a contact pressure applied to the ATR crystal layer by the subject
Implementation Method 3
a spectrum detector and analyzer configured to detect light emitted from the ATR crystal layer, form a light absorption spectrum based on the detected light, and determine an intensity of the light emitted from the ATR crystal layer
Data Source
AI summary
Provided are light absorption spectrum correction devices, methods of manufacturing the light absorption spectrum correction devices, and methods of correcting a light absorption spectrum. The light absorption spectrum correction device includes: a light source configured to emit light; an attenuated total reflectance (ATR) crystal layer configured to contact a subject and provide an optical passage along which the light emitted from the light source travels to the subject; a pressure sensor configured to detect a contact pressure applied to the ATR crystal layer by the subject; a spectrum detector and analyzer configured to detect light emitted from the ATR crystal layer, form a light absorption spectrum based on the detected light, and determine an intensity of the light emitted from the ATR crystal layer; and a spectrum correction device configured to correct the light absorption spectrum based on the contact pressure.