You might have heard of magnetic speed sensors by now and are wondering exactly how they work? How in the heck can a magnet function to determine the speed of something? When it does, what on earth does the magnet give attention to to work, because in the end magnets respond to ferrous metals like iron and steel.
When someone is talking about weight sensor, what they are really discussing is a hall effect sensor. When they are normally used in such systems as anti-lock braking systems in cars, they are in common use within any number of advanced systems and machines that need the usage of electronic transmission of speed or RPM data and information.
They have their good name for the Hall effect that was discovered by way of a man by the name of Edwin Hall in 1879. In a nutshell, is refers to an electronic phenomena that is created on the opposite sides of the electronic conductor when a digital current is flowing through it while a magnetic field is used perpendicular to the current.
Have you ever stopped to wonder how gages and micro load cell in rocket engines work? Man, those engines and all things in them must get hot! So why doesn’t the complete system go haywire when each of the finite mechanisms including speed sensors that gage the rotation rate of all of the different spinning motors get hot enough to melt common metals.
Well it would be easy to guess that they make everything from high temperature alloys. Hey! What about electrical components that contain finite moving parts? Won’t everything short out and how about metal expansion in high temperatures? The fact is, that most of these problems have been solved with the use of new high tech materials.
To start with, high temperature sensors use magnets or silicon strips impregnated with magnetic material to really gage how fast something is spinning, so that eliminates any kind of cable that would foul up in high temperatures. So, this eliminates one problem but what about thew others?
Ceramics Replaces Metal in High Temperatures. Ceramics are actually used extensively in advanced, high temperature speed sensors and in case fact ceramics are finding their way into many high temperature mechanical applications. Its hard, expands minimally, may be shaped and milled and doesn’t conduct electricity and withstands very high temperatures, so ceramics lexnkg great in high temperatures.
For wiring, copper which melts at around 2,000 degrees is replaced by new hi-tech alloys that withstand greater temperatures. Instead of plastic coating, like regular wire, other high tech heat resistant materials such as asbestos are utilized to insulate the wiring in today’s high temperature speed sensor
While that is a mouthful to comprehend, in layman’s terms it enables mechanisms to be utilized to actually calculate the rate of something using electricity rather than a cable and gears. However; there has to be ferrous metal aspects of the device for the magnets within the sensors to concentrate on. For instance, a gear tooth hall effect torque sensor, including is within use within anti-lock braking systems utilizes a gear for the sensor to focus on and tracks the rate from the passing gear teeth to generate data which is brought to the primary component that regulates the whole anti-lock braking system.