Spectrum Noise Removal via Temperature Modulation
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Solution Overview
Problem
Small-sized bio-information measuring spectrometers face challenges in temperature control, which affects the accuracy of bio-information measurement due to temperature-induced noise in the spectrum, as they lack the temperature control systems present in larger spectrometers.
Innovation Solution
A spectrum processing apparatus and method that includes a temperature modulator to change the object's temperature by 1° C. or more, a spectrometer to obtain spectra using Infrared or Raman spectroscopy, and a spectrum processor to extract a temperature change vector using PCA or SVD, which corrects the spectrum by removing noise caused by temperature changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a temperature control system is installed in the spectrometer, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent converts the harmful temperature-induced noise into a beneficial signal by deliberately modulating the temperature of the object. The temperature changes are used to extract temperature change vectors that represent characteristics of respective wavelengths, which are then used to correct the spectrum and remove noise. This transforms the previously harmful temperature variation into a useful correction mechanism.
Solution Approach 2:
The patent changes the temperature parameter of the object being measured. By modulating the temperature within a predetermined range and extracting temperature change vectors at different temperature levels, the system creates a relationship between temperature variations and spectral characteristics. This parameter change enables the system to compensate for temperature effects without requiring active temperature control.
2Measurement precision
If temperature modulation is performed to remove noise, then measurement precision is improved, but measurement time increases
Solution Approach 1:
The patent employs periodic temperature modulation where the temperature is changed within a predetermined range through repeated cycles. The temperature modulator performs modulation one or more number of times to change the temperature of the object within a predetermined range, creating periodic temperature variations that enable noise removal while maintaining efficient measurement timing.
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
This approach effectively removes temperature-induced noise from the spectrum, improving the accuracy of bio-information measurement in small-sized spectrometers by modulating the object's temperature and using noise removal methods based on the extracted temperature change vector.
Implementation Method 1
a heater configured to supply heat energy to the object
Implementation Method 2
a temperature sensor configured to detect the temperature
Implementation Method 3
a detector configured to detect light scattered and/or reflected from the object
Implementation Method 4
a detector configured to detect light scattered and/or reflected from the object
Implementation Method 5
The spectrum processor may extract the temperature change vector based on at least one of Principal Component Analysis (PCA) and Singular Value Decomposition (SVD).
Implementation Method 6
The spectrum processor may remove noise, caused by the change in temperature, from the second spectrum by applying a noise removal method including a least square method based on the extracted temperature change vector.
Data Source
AI summary
Provided is a spectrum processing apparatus for removing noise, caused by a change in temperature, from a spectrum. The spectrum processing apparatus includes: a temperature modulator configured to perform modulation of a temperature of an object; a spectrometer configured to obtain a first spectrum based on the temperature of the object that is changed by the modulation; and a spectrum processor configured to extract a temperature change vector based on the first spectrum, and to correct a second spectrum based on the extracted temperature change vector.