Garden plant health condition detection and early warning system based on spectral analysis

By combining an adaptive closed-loop feedback control system and a DC elimination circuit, the problem of excitation light frequency deviation in the detection of garden plants in existing technologies has been solved, and high-sensitivity and high-reliability detection and early warning of early physiological stress in garden plants have been achieved.

CN122448810APending Publication Date: 2026-07-24SHANDONG AGRICULTURAL UNIVERSITY
2 Cites 0 Cited by

Patent Information

Application Number
CN202610700736.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-05-20
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Existing fluorescence detection technologies based on frequency conversion and sweep frequency modulation cannot achieve adaptive closed-loop matching in the field detection of garden plants. This causes the excitation light frequency to deviate from the sensitive response range of the plant photosynthetic system, making it difficult to accurately capture the subtle changes in biochemical characteristics of early physiological stress. Furthermore, the signal-to-noise ratio is insufficient in complex environments, making it impossible to achieve high-sensitivity and high-reliability detection and early warning.

Method used

An adaptive closed-loop feedback control system, consisting of a tunable excitation light source, a fluorescence detector, a quadrature phase-locked demodulation module, a phase-frequency characteristic analysis module, and an early warning control unit, is used to continuously change the broadband sweep frequency modulation of the excitation light with perturbation. Combined with a DC elimination circuit and a temperature compensation logic core, it filters out background stray light interference and achieves frequency locking, dynamically tracking the relaxation characteristics of plant physiological states.

Benefits of technology

It enables multi-dimensional joint early warning of early physiological stress in garden plants, avoids the misalignment of sensitive response frequency bands in fixed frequency detection, ensures stable signal extraction and accurate detection in complex lighting environments, and improves the sensitivity and reliability of detection.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

The invention discloses a spectral analysis-based garden plant health condition detection and early warning system, which comprises a frequency-adjustable excitation light source, a fluorescence detector, an orthogonal phase-locked demodulation module, a phase-frequency characteristic analysis module, an early warning control unit and an early warning output terminal, the orthogonal phase-locked demodulation module performs operation on the collected electric signals to filter out natural background stray light, the phase frequency characteristic analysis module extracts characteristic relaxation frequency parameters when absolute phase delay parameters reach 45-degree phase angles, and the early warning control unit sends instructions to lock frequency and applies saturated light flash pulses. And the system calculates a dynamic apparent electron transfer rate parameter, and performs double-tolerance threshold comparison according to the temperature drift compensation baseline to judge the physiological stress state of the plant. According to the invention, the defect of dislocation of detection frequency bands is avoided, the interference of strong background light and air temperature fluctuation is eliminated, and multi-dimensional joint early warning of early physiological stress is realized.
Need to check novelty before this filing date? Find Prior Art