Perforated Hall Effect Sensor for Magnetic Biosensing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Magnetic biosensing technologies, particularly Hall effect sensors, face limitations in detecting multiple magnetic labels due to signal cancellation and position-dependent signal variability, which restricts the size of the sensing region and the dynamic range of detection.
Innovation Solution
A Hall effect sensor with a perforated structure featuring an array of through-holes that divides the sensing region into smaller sub-Hall elements, allowing individual magnetic labels to be detected without significant signal cancellation, and enhancing signal homogeneity and linearity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the sensing region of the Hall effect sensor is made large to increase dynamic range, then the ability to detect multiple labels is improved, but opposing components of the stray field cancel out and the net Hall signal tends to zero
Solution Approach 1:
The sensing region is divided into multiple independent sensing elements (pixels) arranged in an array. Each pixel has its own readout circuitry, allowing independent measurement of magnetic signals from different spatial locations. This segmentation prevents signal cancellation by measuring local fields rather than integrating over a large area where opposing fields would cancel.
Solution Approach 2:
The sensing region is organized as a two-dimensional array of sensing pixels rather than a single large sensing area. This spatial arrangement in multiple dimensions allows simultaneous detection of multiple labels at different positions, increasing the quantity of detectable labels while maintaining signal strength through localized measurement.
2Measurement precision
If the sensing region is made small to avoid signal cancellation, then the Hall signal strength is improved, but the dynamic range of detection is reduced
Solution Approach 1:
Multiple small sensing pixels are arranged in an array, with each pixel providing strong localized signal detection. The collective array provides extended dynamic range by capturing signals from multiple spatial locations simultaneously, effectively combining the advantages of small sensing area (strong signal) with large detection capacity (multiple labels).
Solution Approach 2:
Multiple sensing pixels are combined into a single sensor array that functions as an integrated detection system. The individual pixels maintain their small size for strong signal detection, while their combination through the array architecture provides extended dynamic range and increased detection capacity.
3Quantity of substance
If a large array of detectors is formed to increase dynamic range, then the number of detectable labels is improved, but the complexity of addressing circuitry increases
Solution Approach 1:
Each sensing pixel in the array uses the same Hall effect detection mechanism and readout circuitry design. This universal approach allows multiple pixels to be implemented with identical or similar circuit blocks, simplifying the overall design and reducing the complexity of addressing and control compared to using different detector types or complex individual addressing schemes.
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 perforated Hall effect sensor design enables the detection of multiple magnetic labels with improved signal-to-noise ratio and reduced variability, allowing for larger sensing regions and increased dynamic range without complex addressing circuitry.
Implementation Method 1
a Hall effect sensor comprising a Hall element and four contacts to the Hall element for performing a Hall effect measurement
Data Source
Figure 1(a)~1(d)
Figure 2~4
Figure 5~7
AI summary
A biosensing apparatus is described. The biosensing apparatus comprises a Hall effect sensor (41; 42; 51; 58; 61; 68) comprising a Hall element (42; 42') and a set of four contacts (271, 272, 273, 274) to the Hall element for performing a Hall effect measurement. The Hall effect sensor comprises a substrate (81) and a layer structure (83) disposed on the substrate. The layer structure has a principal surface (84) and provides the Hall element (42'). The Hall effect sensor has holes (85) penetrating into or through the layer structure from the principal surface, such that the Hall element contains through holes (46). The apparatus further comprises a binding layer (89) for binding capture molecules (90) thereto, coating selective regions of the Hall effect sensor, outside the holes on the principal surface and/or inside the holes.