Ground Detection Circuit for Low-Reflectivity Surface Sensing
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Solution Overview
Problem
Existing ground detection devices face inaccuracies in detecting ground conditions when the reflectivity of the ground is low, leading to unreliable results due to small signal amplitudes from reflected light.
Innovation Solution
A ground detection device comprising a control circuit, signal trigger circuit, signal sampling circuit, and amplification circuit, which generates and amplifies optical signals to determine the presence of a ground by comparing amplified voltage signals with a preset voltage, and includes a filtering circuit to eliminate interference from ambient light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the reflectivity of the ground is low, then the amplitude of the signal generated by the collected light is small, but the ground detection accuracy deteriorates
Solution Approach 1:
The patent changes the parameter of signal amplitude by introducing an amplification circuit that amplifies the detection signal. When ground reflectivity is low and the reflected light signal is weak, the amplification circuit increases the signal amplitude to a detectable level, thereby maintaining ground detection accuracy despite low reflectivity conditions.
Solution Approach 2:
The patent introduces an amplification circuit as an intermediary component between the signal sampling circuit and the control circuit. This intermediary amplifies the weak detection signal from low-reflectivity ground, enabling the control circuit to accurately determine ground presence even when the original signal amplitude is insufficient.
2Object-affected harmful factors
If ambient interference light is present, then the detection signal contains DC voltage interference, but the ground detection accuracy deteriorates
Solution Approach 1:
The patent extracts and removes the harmful DC voltage component from the detection signal by introducing a filtering circuit. This circuit separates and eliminates the DC interference caused by ambient light, retaining only the useful AC detection signal, thereby improving ground detection accuracy in environments with ambient interference.
Solution Approach 2:
The patent converts the harmful effect of ambient interference light into a beneficial filtering process. By detecting the presence of DC voltage interference and applying appropriate filtering, the system not only removes the interference but also enhances the reliability of ground detection by eliminating false signals.
3Device complexity
If no amplification circuit is used, then the device complexity is low, but the ground detection accuracy for low reflectivity ground deteriorates
Solution Approach 1:
The patent changes the signal amplitude parameter by adding an amplification circuit, accepting the increased device complexity as necessary to achieve accurate ground detection for low-reflectivity surfaces. The amplification circuit transforms weak undetectable signals into usable detection levels.
Solution Approach 2:
The patent applies preliminary amplification action to the detection signal before it reaches the control circuit. By pre-amplifying the signal in advance, the system ensures that even weak signals from low-reflectivity ground are sufficiently strong for accurate detection, preventing detection failures before they occur.
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
The solution enables accurate ground detection even with low reflectivity by amplifying detection signals and filtering out interference, resulting in reliable determination of ground conditions within the detection area.
Implementation Method 1
the signal sampling circuit is configured to acquire reflected light of the optical signal reflected by a detection area and ambient interference light, and to generate a second voltage signal according to the reflected light and the ambient interference light
Data Source
AI summary
Embodiments of the present application relate to the field of ground detection, and disclose a ground detection device, a robot and a ground detection method. The ground detection device includes a control circuit, a signal trigger circuit, a signal sampling circuit and an amplification circuit. Where, the signal sampling circuit is configured to acquire reflected light of the optical signal reflected by a detection area and ambient interference light, and to generate a second voltage signal according to the reflected light and the ambient interference light; the amplification circuit is configured to amplify the second voltage signal to acquire a third voltage signal; and the control circuit is configured to compare the third voltage signal with a preset voltage, and to determine whether there is a ground within the detection area according to a comparison result.