Spectrum Measuring Apparatus Using Dynamic Current Control
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Solution Overview
Problem
Existing small spectrometers face challenges in accurately measuring skin spectrum with a reduced number of light sources, requiring innovative methods to enhance measurement precision and prevent photodetector saturation.
Innovation Solution
A spectrum measuring apparatus and method utilizing multiple light sources emitting different wavelengths, controlled by varying currents, with a photodetector and processor to measure and reconstruct the spectrum, including gain adjustment to prevent saturation and obtain accurate object spectra.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the number of light sources is reduced to create a small spectrometer, then device size is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent applies parameter changes by varying the current intensity applied to each light source to emit light of different wavelengths. The processor adjusts the current parameters to optimize the spectral output from the reduced number of light sources, enabling accurate skin spectrum measurement despite having fewer light sources than traditional spectrometers
Solution Approach 2:
The system dynamically adjusts the current intensity to each light source based on the required wavelength output. The processor controls the light sources in real-time, changing their operational parameters to emit the appropriate spectrum for skin measurement, allowing a small number of light sources to perform the work of many fixed sources
2Illumination intensity
If current intensity is increased to improve light emission, then illumination intensity is improved, but photodetector saturation occurs
Solution Approach 1:
The processor implements feedback control by monitoring the light intensity received by the photodetector and adjusting the current intensity to light sources accordingly. When the photodetector approaches saturation, the processor reduces the current to prevent saturation while maintaining sufficient illumination for accurate measurement
Solution Approach 2:
The system dynamically adjusts the current intensity to each light source based on real-time measurement conditions. The processor modulates the light emission intensity to match the photodetector's optimal operating range, preventing saturation while ensuring sufficient signal strength for accurate spectrum reconstruction
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
Enables precise measurement of skin spectrum with a reduced number of light sources by controlling light intensity and preventing photodetector saturation, allowing for accurate reconstruction of object spectra.
Implementation Method 1
a plurality of light sources configured to emit light of different wavelengths onto an object, based on current at various intensities that is applied to each of the plurality of light sources
Implementation Method 2
a photodetector configured to receive light that is one among reflected from, scattered from, and transmitted into the object onto which the light is emitted, and measure an intensity of the received light
Implementation Method 3
The photodetector may be further configured to amplify the received light, based on a predetermined gain
Data Source
AI summary
A spectrum measuring apparatus includes a plurality of light sources configured to emit light of different wavelengths onto an object, based on current at various intensities that is applied to each of the plurality of light sources, a photodetector configured to receive light that is one among reflected from, scattered from, and transmitted into the object onto which the light is emitted, and measure an intensity of the received light, and a processor configured to obtain spectrum of the object, based on the measured intensity of the received light.