Turbidimeter LED Spectrum Correction for Lamp Compatibility
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Solution Overview
Problem
Existing turbidimeters using lamp light sources face issues with compatibility when switching to LED light sources, as the different wavelength characteristics affect turbidity measurement results, leading to inconsistent readings and reduced accuracy.
Innovation Solution
A turbidity measurement method and turbidimeter that irradiate multiple light sources with distinct spectra, allowing for detection signal processing to correct parameters and ensure turbidity calculations match those from a standard lamp light source, using a combination of transmitted and scattered light comparison methods to maintain accuracy across light source changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If LED light sources are used to replace lamp light sources, then energy efficiency and lifespan are improved, but measurement precision deteriorates due to different wavelength characteristics
Solution Approach 1:
The patent combines multiple LED light sources with different wavelength characteristics (blue LED at 450nm and violet LED at 405nm) to create a composite light source system. This merging approach allows the system to simulate the spectral characteristics of traditional lamp light sources while maintaining the energy efficiency and lifespan advantages of LEDs, thereby resolving the contradiction between energy efficiency improvement and measurement precision maintenance.
Solution Approach 2:
The patent changes the operational parameters of LED light sources by using multiple LEDs with different wavelengths and adjusting their respective intensities. The control unit varies the emission intensity of each LED to match the spectral power distribution of traditional lamp light sources, enabling accurate turbidity measurements while retaining LED advantages in energy consumption and durability.
2Duration of action of stationary object
If LED light sources are used to replace lamp light sources, then device lifespan is improved, but compatibility with existing measurement standards deteriorates
Solution Approach 1:
The patent adjusts the spectral parameters of LED light sources by controlling the intensity ratio of blue (450nm) and violet (405nm) LEDs to reproduce the spectral characteristics of traditional lamp light sources. This parameter adjustment enables compatibility with existing turbidity measurement standards and protocols while maintaining the extended lifespan advantage of LED technology.
Solution Approach 2:
The patent creates a copy of the spectral power distribution characteristics of traditional lamp light sources using multiple LED light sources. By replicating the spectral features rather than directly copying the physical lamp structure, the system achieves compatibility with existing measurement standards while benefiting from LED longevity and energy efficiency.
3Measurement precision
If multiple light sources with different spectra are used, then measurement accuracy across different turbidity levels is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple LED light sources with different wavelengths into a single integrated light source assembly. The control unit manages the multiple LEDs through unified control logic that adjusts their respective intensities based on the measured turbidity level, achieving accurate measurements across different turbidity ranges while keeping the system structure relatively compact and manageable.
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 consistent turbidity measurement results when transitioning from lamp to LED light sources, improving measurement accuracy and convenience by aligning LED-based measurements with traditional lamp-based standards, even in highly turbid liquids.
Implementation Method 1
a light receiver configured to acquire a detection signal of first measured light based on the first irradiation light irradiated towards the liquid to be measured and a detection signal of second measured light based on the second irradiation light irradiated towards the liquid to be measured
Implementation Method 2
the turbidimeter being configured to calculate a ratio of the detected scattered light intensity to the detected transmitted light intensity
Data Source
AI summary
A turbidity measurement method includes irradiating a first irradiation light L1 having a first spectrum E1, detecting a first measured light ML1 based on the first irradiation light L1, irradiating a second irradiation light L2 having a second spectrum E2 different from the first spectrum E1, detecting a second measured light ML2 based on the second irradiation light L2, calculating turbidity of a liquid to be measured, and correcting at least one of a first parameter related to turbidity calculation associated with the first irradiation light L1 and a second parameter related to turbidity calculation associated with the second irradiation light L2 so that the calculated turbidity of the liquid to be measured corresponds to the turbidity of the liquid to be measured as measured using another light source serving as a standard of comparison.