Digital Displacement Sensor Dynamic Comparator Signal Stability
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Solution Overview
Problem
Traditional displacement sensors face challenges in generating stable square wave signals due to changes in distance, moving speed, temperature, humidity, and ambient light, leading to measurement errors, especially when converting sinusoidal signals into square waves.
Innovation Solution
A digital displacement sensor system utilizing two reflective photoelectric sensors with a 180-degree phase difference, generating a third signal through a comparator that is not affected by these changes, allowing for reliable digitization of length measurements by counting ascending and descending waveforms, and compensating for environmental factors through digital processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a traditional voltage comparator with fixed DC voltage is used to convert sinusoidal signal to square wave, then the conversion process is simple, but the generated square wave signal becomes unstable when distance changes
Solution Approach 1:
The patent applies dynamics by making the comparator reference voltage dynamic instead of fixed. The reference voltage automatically tracks and adapts to the changing sinusoidal signal characteristics based on distance variations, allowing the system to maintain stable square wave output despite distance changes. This is achieved through automatic adjustment mechanisms that modify the reference voltage level according to the actual signal conditions.
Solution Approach 2:
The patent implements feedback by using the sinusoidal signal itself to automatically adjust the comparator's reference voltage. The system monitors the signal characteristics and feeds this information back to modify the reference level, creating a self-regulating mechanism that maintains signal stability. This feedback loop ensures the square wave generation remains reliable even when distance and signal amplitude vary.
2Adaptability or versatility
If the distance between sensor and measured object changes, then the sensor signal amplitude changes significantly, but using fixed voltage threshold fails to adapt to these changes
Solution Approach 1:
The patent applies parameter changes by dynamically modifying the comparator reference voltage parameter according to distance variations. Instead of using a fixed voltage threshold, the system adjusts the reference voltage level to match the changing signal amplitude caused by distance changes. This parameter adaptation ensures that the square wave conversion maintains accuracy across different measurement distances.
3Length of stationary object
If photoelectric sensor is used for displacement measurement, then the measurement range is extended, but the signal becomes weaker when distance is larger
Solution Approach 1:
The patent applies dynamics by implementing automatic reference voltage adjustment that adapts to signal strength variations. When the distance increases and signal becomes weaker, the system dynamically modifies the reference voltage to maintain proper signal threshold detection. This dynamic adaptation allows the photoelectric sensor to operate reliably across extended measurement ranges without sacrificing signal detection accuracy.
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 system provides stable and accurate displacement measurements by maintaining signal consistency despite changes in distance and environmental factors, reducing mechanical wear and allowing for flexible material use, with adjustable accuracy and a simple, cost-effective design.
Implementation Method 1
the signal acquisition module includes at least two photoelectric sensors, the two photoelectric sensors are configured to acquire a first signal and a second signal respectively
Data Source
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AI summary
The present invention discloses a digital displacement sensor and a displacement measuring method thereof which pertain to the technical field of displacement sensors. The digital displacement sensor includes a housing and a circuit board, and the circuit board is arranged inside the housing. The housing is provided with a window and an opening. The circuit board is provided with a signal acquisition module, an analog front end circuit, a digital compensation circuit, and a signal output interface. The digital displacement sensor allows to alternatively fix the sensor or measured object according to the structure. The measurement can be performed as long as a relative movement between the sensor and the measured object occurs. Factors such as material of the measured object etc. are not limited, so materials such as steel belts, aluminum plates, plastics etc. can be flexibly used. Merely surfaces of the measured object need to be coated with corresponding stripes. The sensor itself can perform digital processing and digitally compensate the environmental errors. Since the sensor does not contact with the measured object, there is no mechanical wear, so the service life is longer. The present invention has a simple structure, low cost, and the sensor accuracy can be adjusted by placing multiple groups of sensing elements, thereby greatly reducing the requirement on the stability of the signal quantity of the sensor.