Data on the possible applications of pressure transducers is also provided. There are many applications of these devices, especially in the industrial setting although they are also helpful in monitoring the tire pressure of automobiles. A frequent design for them, such as the Keller pressure sensors, is one that makes use of piezoresistive materials. These materials have the unusual characteristic whereby their resistance changes correspondingly with the force or pressure that is applied on them. These materials make up the key component of the sensors, which is the sensing diaphragm. This diaphragm is designed in such a way that its movement depends on the amount of pressure that is applied. However, it is also common for people to inquire on “how do pressure sensors work?,” because they realize that they are part of the systems for continuously monitoring the pressure of their car tires.
For those who are inquiring “how do pressure sensors work?” and are also interested on the mechanisms of the tire pressure sensor, this is a kind of technology that is designed for safety. It warns the driver in the event of a low tire pressure. This type of tire pressure monitoring system (TPMS) was mandated by the National Highway Traffic Safety Administration for all vehicles that are sold after 2008. There are two categories for TPMS and these are the direct and indirect systems. The direct TPMS has pressure transducers installed for every tire to constantly check on the tire pressure. However the indirect TMPS calculates the air pressure in the tire by measuring other variables, including the tires’ revolution per minute.
They can be of various kinds and include the differential, gauge, air, piezoresistive, digital, vacuum, and absolute pressure sensor. However, one of the most common designs uses piezoresistive materials, which means that the current is directly proportional to the pressure applied. The material is normally utilized is the semiconductor silicon. Several thin wafers of silicon are sandwiched in between protective materials.
So, how do pressure sensors work when they are specifically applied for ensuring that car tire pressure is within the proper range? Well, there are two basic components of the direct TPMS and these are the radio transmitter for sending the collected information to the vehicle’s on-board computer and the pressure sensor that is placed within the tire rim. Radio transmission is through the car antenna, which detects the signals and then routes them to the central monitoring system. However, for the indirect type of TPMS, the pressure transducers are not needed. The amount of pressure in the tires is estimated by determining the diameters of the tires. In turn, the diameters of the tires are calculated by using the rotational speed as input. If the on-board computer detects a somewhat faster rotational speed for one of the tires, it warns the driver that this particular tire has a lower air pressure because it has a smaller diameter.