Perhaps you have heard of magnetic speed sensors at this point and are wanting to know exactly how they work? How in the heck can a magnet function to determine the speed of something? If it does, what on earth does the magnet focus on to work, because after all magnets respond to ferrous metals such as iron and steel.
When someone is speaking about weight sensor, whatever they really are talking about is actually a hall effect sensor. When they are normally used in such systems as anti-lock braking systems in cars, they are now in common use in a variety of advanced systems and machines that require using electronic transmission of speed or RPM data and data.
They obtain their name for the Hall effect that was discovered with a man named Edwin Hall in 1879. In a nutshell, is describes a digital phenomena which is created on the opposite sides of an electronic conductor when an electronic current is flowing through it while a magnetic field is used perpendicular to the current.
Perhaps you have stopped to wonder how gages and sensors in rocket engines work? Man, those engines and everything in them must get hot! Why doesn’t the entire system go haywire when all of the finite mechanisms including compression load cell that gage the rotation rate of all the different spinning motors get hot enough to melt common metals.
Well it will be simple to guess that they make everything away from high temperature alloys. Hey! Have you thought about electrical components which contain finite moving parts? Won’t everything short out and how about metal expansion in high temperatures? The reality is, that most of these problems have already been solved by using new hi-tech materials.
To start with, high temperature sensors use magnets or silicon strips impregnated with magnetic material to really gage how quickly something is spinning, so that eliminates any type 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 used extensively in high tech, high temperature speed sensors and when fact ceramics have found their way into many high temperature mechanical applications. Its hard, expands minimally, can cqjevg shaped and milled and doesn’t conduct electricity and withstands very high temperatures, so ceramics works great in high temperatures.
For wiring, copper which melts at around 2,000 degrees is replaced by new hi-tech alloys that endure greater temperatures. Rather than plastic coating, like regular wire, other high tech heat resistant materials such as asbestos are employed to insulate the wiring in today’s high temperature speed sensor
While that is a mouthful to comprehend, in layman’s terms it allows for mechanisms to be used to really calculate the pace of something using electricity as opposed to a cable and gears. However; there should be ferrous metal components of the program for the magnets inside the sensors to concentrate on. For example, a gear tooth hall effect speed sensor, such as is at use within anti-lock braking systems uses a gear for the tension compression load cell to pay attention to and tracks the pace from the passing gear teeth to produce data that is delivered to the main factor that regulates the whole anti-lock braking system.