Abstract:
A method and system for detecting a magnetic field utilizing a magnetoresistor (100) of a magnetic sensor are described herein. A normalized magnetoresistance associated with the magnetoresistor (100) can be calculated such that the magnetoresistor (100) comprises an initial magnetization direction thereof. The magnetic field is generally permitted to exceed (408) an ability of the magnetoresistor (100) to remain pointed in the initial magnetization direction, thereby enabling the magnetoresistor (100) to experience a magnetization reversal (300) thereof. The normalized resistance may be placed into a new state in response to the magnetization reversal (300) thereof, thereby permitting the normalized resistance to be utilized as a switch thereof and allowing the magnetic sensor to detect changes in the magnetic field associated with the magnetoresistor (100).
Abstract:
Optical sensor methods and systems for detecting the edge of an object are disclosed. An optical sensor having dual equal area active regions can be provided, and a uniform light source located opposite the optical sensor, such that an occlusion of light from the uniform light source provides location determination data of an object via the optical sensor regardless of the direction of motion of the occlusion relative to the dual equal area active regions thereof.
Abstract:
A vertical cavity surface emitting laser (VCSEL) operable as a signal emitter and a silicon photodetector adapted for receiving light signals co-mounted in a common canister. Also containable is a four lead header and an isolating ceramic spacer. The canister can be electrically connected to a first lead from the header. The isolating ceramic spacer is adapted for mounting of the VCSEL above the level of the photodetector within the can. The VCSEL is electrically connectable to a second and third lead from the header and the photodetector is electrically connectable to the second and a fourth lead from the header. Co- packaging of a VCSEL and photodetector in common device canisters can yield about a 20:1 contrast ratio between an object's presence in front of the sensing system. A small pattern necessary for high accuracy is provided by the system and no barrier is necessary between the emitter and detector.