Length Measuring Device With Magnetic Encoder
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Solution Overview
Problem
Conventional measuring tapes struggle to accurately measure both straight and curved lengths, especially in environments with dust, and are prone to operator errors due to manual measurement and limited resolution.
Innovation Solution
A length measuring device with a rotating part and magnetic encoders that uses a string and guiding mechanism to calculate length measurements, allowing for accurate measurement of straight and curved lengths by detecting rotation and preventing inertia-induced errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional measuring tape is used to measure straight lengths, then it can measure straight lengths, but it cannot measure curved lengths accurately
Solution Approach 1:
The measuring tape is transformed from a rigid ruler structure to a flexible tape structure that can dynamically adapt to both straight and curved surfaces. The tape can be bent and conform to the geometry of the measured object while maintaining measurement accuracy through the flexible yet stable material construction.
Solution Approach 2:
The physical state of the measuring tape is changed from rigid to flexible by altering its material properties and structural parameters. This allows the tape to adapt its shape according to the measurement requirements while maintaining sufficient stability for accurate reading of measurements.
2Adaptability or versatility
If a freely bendable measuring tape is used to measure curved lengths, then it can measure curved lengths, but it cannot measure long lengths accurately because the tape bends
Solution Approach 1:
The tape is designed with controlled curvature characteristics that allow it to conform to the measured surface without excessive bending. The tape maintains a gentle, manageable curvature that enables it to follow curved surfaces while preventing unauthorized bending that would compromise measurement accuracy over long distances.
Solution Approach 2:
The flexibility parameter of the tape is optimized to achieve a balance between adaptability to curved surfaces and resistance to excessive bending. By adjusting material composition, thickness, and structural parameters, the tape achieves sufficient flexibility for curved measurements while maintaining enough rigidity to prevent inaccurate bending during long-length measurements.
3Ease of operation
If manual measurement with a conventional measuring tape is performed, then the operator can check measurements, but errors may be generated depending on operators and manual recording is required
Solution Approach 1:
The manual reading and recording process is replaced with electronic sensing and digital recording systems. Sensors detect the measurement data automatically as the tape is extended or rotated, and the control unit processes and stores this data electronically, eliminating human reading errors and manual transcription requirements.
Solution Approach 2:
The measuring device performs automatic measurement and data recording without requiring manual intervention for reading and transcription. The system self-measures the length or circumference and automatically records the results, reducing operator involvement to simply initiating and retrieving the measurement.
4Extent of automation
If a photo interrupter method is used in an electronic measuring tape, then electronic measurement is achieved, but it is not suitable for dusty environments and resolution is limited to intervals between holes
Solution Approach 1:
The optical photo interrupter sensing method is replaced with magnetic field-based sensing. Magnets attached to rotating components interact with magnetic sensors (such as Hall effect sensors or reed switches) to detect rotation and calculate measurements. Magnetic fields penetrate dust particles effectively, providing reliable operation in dusty construction environments where optical methods fail.
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 device provides increased accuracy and versatility in measuring long straight and curved lengths, reducing operator errors and improving measurement precision compared to traditional methods.
Implementation Method 1
a magnetic encoder configured to calculate an amount of rotation of the rotator by detecting a change in a magnetic field generated by a rotation of the magnet
Data Source
AI summary
A length measuring device is provided, which includes a case, a first rotating part configured to rotate while a portion of a circumference thereof exposed outside the case is in contact with a measured object, a rotation interfering part configured to interfere with an inertial rotation of the first rotating part, and a control part configured to calculate a length measurement using an amount of rotation of the first rotating part.