Autosampler Encoder Array for Position Determination
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Solution Overview
Problem
Existing autosamplers and autoloading systems face challenges in accurately determining the position of multiple sites without calibration, particularly in systems where the zero position needs to be recalibrated between position determinations, and they often require the sampling tube to be removed during loading and unloading processes.
Innovation Solution
The implementation of an autosampler with a support system coupled to a longitudinal shaft, featuring a stepper motor for rotational and linear movement, and an encoder with an array of distinguishable elements of varying length to generate a code for each position, allowing for independent position determination without calibrating the zero position and enabling the sampling tube to remain stationary during loading and unloading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an encoder with array of distinguishable elements is used to determine position, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The encoder is divided into multiple distinguishable elements of varying lengths arranged in an array, where each element represents a specific position segment. This segmentation allows the system to determine absolute position by reading which segment is currently under the sensor, achieving high measurement precision without requiring a complex continuous encoding mechanism.
Solution Approach 2:
Instead of using a complex continuous encoder pattern, the invention uses discrete copies of distinguishable elements (such as lines, notches, or gaps) of different lengths that are repeated in the array. Each copy represents a position marker, and the variation in length among copies provides the encoding information, simplifying the overall device structure while maintaining precision.
2Ease of operation
If the sampling tube is removed during loading and unloading, then ease of operation is improved, but loss of time increases
Solution Approach 1:
The support is pre-configured with multiple sites that can independently receive and hold articles. The encoder system is pre-programmed to track the position of each site, allowing the system to automatically navigate to the correct site for loading or unloading without requiring manual intervention or tube removal, thus saving time while maintaining operational ease.
3Reliability
If the zero position is recalibrated between position determinations, then reliability is improved, but loss of time increases
Solution Approach 1:
The encoder system is designed to automatically determine the absolute position of the support at any time without requiring external calibration or reference to a zero position. The array of distinguishable elements provides inherent position information that the system can read and interpret autonomously, eliminating the need for time-consuming recalibration while maintaining reliable position determination.
4Adaptability or versatility
If multiple sites are supported with position determination, then adaptability is improved, but device complexity increases
Solution Approach 1:
The encoder array serves multiple functions simultaneously: it determines the absolute position of the support, identifies which specific site is currently under the sensor, and provides information about the orientation of the support. This multi-functionality is achieved through a single unified encoding structure rather than requiring separate systems for each function, thereby improving adaptability without proportionally increasing complexity.
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 solution enables precise and efficient loading and unloading of samples across multiple sites without the need for recalibration, while maintaining the sampling tube's position, enhancing the accuracy and operational efficiency of autosamplers in thermal gravimetric analysis and other chromatography devices.
Implementation Method 1
a first motor coupled to the support and configured to rotate the support in an x-y plane, and a second motor configured to move the support in a z-direction
Implementation Method 2
an encoder spatially coupled to the support and configured to provide a position of the support using a code read from the encoder, in which the encoder comprised an array of distinguishable elements of varying length
Data Source
AI summary
Certain configurations described herein are directed to autosamplers. In some instances, the autosampler may include a support comprising a body configured to receive two or more articles at separate sites of the body. The autosampler may also include a first motor coupled to the support and configured to rotate the support in an x-y plane, and a second motor configured to move the support in a z-direction to load one of the at least two articles at the separate sites in the body of the support. An encoder may also be used with the autosampler if desired.