IGPS Rescaling Using Linear Encoder and Vector Bar
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Solution Overview
Problem
Existing three-dimensional measurement systems using an Indoor Global Positioning System (IGPS) face challenges in accurately measuring distances between two positions due to human error in indicating points, leading to cumulative measurement errors.
Innovation Solution
A system and method incorporating a rescale bar with linear scales, a linear encoder for measuring absolute lengths, and optical transmitters radiating pan beams, where a vector bar attached to the encoder detects coordinates and calculates a ratio between relative and absolute lengths to accurately rescale the distance between two positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a worker directly indicates a point on the scale bar using hands, then the measurement process is simple and fast, but the measurement precision deteriorates due to human error and cumulative errors
Solution Approach 1:
The patent replaces the manual mechanical indication method with an automated optical-electronic measurement system. The vector bar with receiver detects laser beams from optical transmitters to automatically determine coordinates, eliminating the need for manual hand indication and thereby removing human error from the measurement process while maintaining measurement speed
Solution Approach 2:
The patent introduces an intermediary measurement system consisting of optical transmitters, a receiver, and a processing unit that mediates between the scale bar and the final measurement result. This intermediary system objectively captures position data without human intervention, resolving the contradiction between simple operation and precise measurement
2Device complexity
If manual indication method is used, then the device complexity is low, but the reliability of measurement deteriorates due to cumulative errors in long-distance measurements
Solution Approach 1:
The patent replaces the simple but unreliable manual indication system with an automated optical-electronic measurement system. The vector bar with receiver and coordinate processing unit provides consistent, repeatable measurements that eliminate cumulative errors, accepting increased device complexity as necessary for improved reliability
Solution Approach 2:
The measurement system performs self-measurement without human intervention. The vector bar automatically detects its position through laser beam reception and the processing unit automatically calculates coordinates and distances, ensuring consistent and reliable measurements across multiple trials
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 approach significantly reduces measurement errors, providing more accurate distance measurements by eliminating the need for direct human indication, thus preventing cumulative errors and ensuring precise distance calculations.
Implementation Method 1
a receiver to detect the pan beams radiated from the optical transmitters
Data Source
AI summary
A three-dimensional measurement system using an IGPS includes a rescale bar having linear scales thereon, a linear encoder for measuring an absolute length within which the linear encoder moves on the rescale bar, a plurality of optical transmitters that radiates pan beams, and a vector bar having one end attached to the linear encoder, and having a receiver to detect the pan beams radiated from the optical transmitters, the vector bar acquiring coordinates of two points where the vector bar moves by using the receiver, and measuring a relative length from the coordinates. A ratio between the absolute length and the relative length is applied in rescaling an actual distance between two positions to be measured.