Algae Stress Detection via Minimal Wavelength Fluorescence
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Solution Overview
Problem
Current microalgae farming practices lack an effective method for continuous online monitoring of algae crops, leading to delayed detection of stress and suboptimal growth conditions.
Innovation Solution
The implementation of a method that uses a minimal set of calculated wavelengths for fluorescence monitoring to detect microalgae stress and physiological state in situ, employing machine learning to identify the optimal set of wavelengths for each algal species.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If traditional offline monitoring with laboratory analysis is used, then operational simplicity is maintained, but detection speed and response time deteriorate
Solution Approach 1:
The patent replaces manual offline laboratory analysis with automated online optical monitoring using fluorescence spectroscopy. The system uses excitation light sources and detectors to continuously monitor algal physiological states in real-time, eliminating the need for physical sample collection and laboratory processing, thus dramatically reducing detection time while maintaining manageable system complexity through standardized optical components
Solution Approach 2:
The patent introduces fluorescence signals as an intermediary parameter to indirectly assess algal physiological states and stress conditions. By measuring fluorescence emission at specific wavelengths following excitation, the system obtains real-time information about algal health without directly measuring complex biological parameters, enabling rapid detection while keeping the monitoring system relatively simple
2Measurement precision
If comprehensive optical monitoring across multiple wavelengths is implemented, then measurement precision improves, but device complexity and cost increase
Solution Approach 1:
The patent applies local quality by selecting specific excitation and emission wavelength pairs that are most sensitive to particular algal stress conditions. Instead of uniformly monitoring all wavelengths, the system focuses optical measurement resources on critical wavelength regions where fluorescence changes provide the most diagnostic information about algal physiological states, thereby achieving high measurement precision with reduced device complexity
Solution Approach 2:
The patent utilizes parameter changes in fluorescence emission intensity and spectral characteristics at specific wavelengths as indicators of algal stress. By monitoring changes in these optical parameters rather than attempting to measure all physical-chemical parameters simultaneously, the system achieves precise stress detection with a relatively simple optical configuration targeting specific wavelength-dependent fluorescence responses
3Productivity
If frequent online monitoring is implemented, then productivity through early stress detection improves, but use of energy and resources increases
Solution Approach 1:
The patent applies partial action by implementing continuous monitoring only at strategically selected wavelength pairs rather than comprehensive spectral scanning at all wavelengths. This approach enables frequent online monitoring for early stress detection while minimizing energy consumption by activating only the specific excitation sources and detectors needed for critical measurements, rather than running full-spectrum analysis continuously
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 enables early detection of stress, optimizing growth cycles and resource utilization, and providing accurate management of the production process, thereby improving the overall efficiency and profitability of microalgae farming.
Implementation Method 1
irradiating the algae at a predetermined first set of wavelengths; monitoring the algae at a predetermined second set of wavelengths to detect fluorescence and/or absorbance of the stressed algae
Implementation Method 2
Microalgae do not need to be grown on arable land, can be grown on seawater on residual nutrients, have a high areal productivity
Data Source
AI summary
A method for monitoring species of algae for stress comprises growing a test set of algae of a given species, applying a stress of a predetermined kind to some of the algae, and irradiating the algae at a predetermined first set of wavelengths. The algae are then monitored at a predetermined second set of wavelengths to detect fluorescence and/or absorbance carried out on the first set of wavelengths by the stressed algae. The detected fluorescence and/or absorbance is compared for each irradiation wavelength between the stressed algae and unstressed algae to find signs indicating the applied stress. There is then a stage of searching through combinations of respective irradiation wavelengths and detected wavelengths to find a minimal set of irradiating and detected wavelengths that detects the stress. The smallest size set is then used in irradiating further sets of algae of the tested species to detect the given stress.