Dual Ultrasonic Sensor Wrinkle Detection for Sheet Abnormalities
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Solution Overview
Problem
Existing ultrasonic detection apparatuses struggle to accurately detect wrinkles and abnormalities on sheets or objects, especially when they occur in specific patterns or over wide ranges, due to limitations in the number of ultrasonic sensors and the gentle inclination of the sheet, leading to difficulties in phase shift detection.
Innovation Solution
An ultrasonic apparatus with two sensors, one transmitting and receiving ultrasonic waves in the downstream and the other in the upstream, calculates distances and outputs an error signal when the difference exceeds a threshold, allowing for accurate detection of abnormalities across multiple positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If only one pair of ultrasonic transmission and reception apparatus is provided, then the device complexity is low, but the measurement precision and detection reliability are insufficient for wrinkles occurring in specific patterns or wide ranges
Solution Approach 1:
The detection system is segmented into multiple ultrasonic sensor pairs positioned at different locations (upstream and downstream). Each sensor pair independently measures phase shifts in its local region, enabling comprehensive detection of wrinkles regardless of their position or pattern on the sheet.
2Reliability
If ultrasonic waves are transmitted and received at only one predetermined location, then the device complexity is low, but the detection reliability fails when wrinkles occur in upstream areas or over wide ranges
Solution Approach 1:
The detection approach transitions from a single-point measurement to a multi-point spatial distribution of sensors. By arranging ultrasonic sensor pairs at different positions along the sheet transport direction, the system creates a dimensional expansion in detection coverage, ensuring reliable detection of wrinkles regardless of their longitudinal position or spatial extent.
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 configuration enables more accurate detection of wrinkles and abnormalities by comparing distances from both sensors, improving the ability to detect patterns and wide-range issues that were previously undetectable.
Implementation Method 1
a first ultrasonic sensor that transmits a ultrasonic wave to an object and receives the ultrasonic wave reflected by the object
Implementation Method 2
receives the ultrasonic wave reflected by the object
Data Source
AI summary
An ultrasonic apparatus includes a first ultrasonic sensor that transmits an ultrasonic wave to an object and receives the ultrasonic wave reflected by the object, a second ultrasonic sensor that transmits an ultrasonic wave to the object and receives the ultrasonic wave reflected by the object, an determination circuit that outputs an error signal when the difference between a first distance between the first ultrasonic sensor and the object calculated based on ultrasonic wave transmission and reception processing using the first ultrasonic sensor and a second distance between the second ultrasonic sensor and the object calculated based on ultrasonic wave transmission and reception processing using the second ultrasonic sensor is equal to or greater than a threshold value.