Surveyors Use Reed Sensors to Accurately Measure Linear Distance

Introduction

For many years surveyors’ essential piece of equipment was and still is their measuring distance device called the surveyors wheel. Most plots of land are precisely broken up into parcels of land in a very accurate manner, particularly in residential areas where every foot or meter needs to be accounted for. Often squabbles occur between residents with the only way to resolve them is the accurate pacing off of the plot distances by an accurate measuring device and a competent surveyor. Often these measuring devices used a walking device having a wheel that translates circular motion into a linear distance. These devices used a mechanical means to establish the distance. These mechanical devices did not always prove reliable and would often fail at the most inappropriate times. Designers have now chosen MEDER’s reed sensors as an inexpensive way to accurately measure the linear distance in a very reliable manner.

Full application write up: Surveyors Wheel uses a Reed Sensor and Magnets to Accurately Measure Linear Distance

Features

• Magnet and Reed Sensor are isolated and have no physical contact by typically having the multiple magnets mounted to the rotating wheel and the Reed Sensor is mounted strategically such that the magnetic field of the magnets will be sensed by each reed sensor during the rotation.
• The reed switch used in the Reed Sensor is hermetically sealed and is therefore not sensitive to the environments
• The magnet is not affected by its environment
• Tens of millions of reliable operations
• Surface mount and through-hole packages available
• Contacts dynamically tested