Magnetic Particle Flow Detector Using Conductor Traces

The patent creates a localized region of enhanced magnetic field gradient directly above the sensor by positioning conductor traces in specific patterns (e.g., parallel traces, interdigitated comb patterns) beneath the microchannel. This local enhancement concentrates the magnetic field disruption caused by passing particles, making small particles detectable against the background noise by creating a distinct local field signature that differs from the uniform background field.

The patent introduces conductor traces as an intermediary element between the particle source and the sensor. These conductors carry current that generates a magnetic field which interacts with the magnetic particles, amplifying their magnetic signature. The conductors act as a mediator that translates the weak magnetic signal from small particles into a detectable electrical signal by creating a controlled magnetic environment that enhances particle-sensor interaction.

The patent creates localized magnetic field gradients in specific regions of the microchannel by strategically positioning conductor traces. These localized field regions act as magnetic traps or guiding zones that concentrate particles at predictable locations (e.g., channel centerline or specific lateral positions) without requiring complete flow control mechanisms, thus maintaining natural flow conditions while achieving location predictability for detection.

The patent replaces mechanical particle confinement mechanisms (such as physical barriers, valves, or pumps that would mechanically control particle position) with magnetic field-based control. By using current-carrying conductor traces to generate magnetic field gradients, the system achieves particle positioning and confinement through magnetic forces rather than mechanical means, preserving natural flow conditions while enabling predictable particle location for detection.