Ceramics Used For Sensors

Ceramic pressure sensors are available in a wide range of designs each suited for use in particular applications.

Ceramics used for sensors. With the acquisition of the electro ceramics division from morgan technical ceramics ceramtec has broadened its already extensive range of piezo ceramic materials and products. Advanced ceramics are special type of ceramics used mainly for electrical electronic optical and magnetic applications. This article briefly describes two important automotive applications of. Piezoelectric ceramics used as the transmitter typically operate at their resonance frequency while sensors used as a receiver typically operate in an anti resonant mode.

These electrical signals can be input to feedback systems to stimulate movements in actuators to trigger alarms or to switch the systems on or off. For example ceramic tire pressure monitoring systems warn occupants if there is any sudden loss of tire pressure or if one of the tires is improperly pressurized. Flow sensors and flow meters. Ceramic sensors have been in use for more than thirty years.

Ceramic sensors are also used in the development of advanced monitoring systems. Automotive ceramics advanced ceramic materials that are made into components for automobiles. Examples include spark plug insulators catalysts and catalyst supports for emission control devices and sensors of various kinds. Typical examples are electrical feedthroughs on al 2 o 3 basis to withstand pressure above 1000 bar or substrates made of aln ceramic which thanks to their high thermal conductivity of more than 200 w m k 1 are used in demanding electronic applications.

All these features make ceramic pressure sensors ideal for a large number of industrial applications particularly if accuracy dynamic range and corrosion resistance are critical requirements. Passive ceramics used in passive sensing applications operate below their. The resistance decreases by two to three orders of magnitude in the range 12 to 95 relative humidity. Types of ceramic pressure sensors.

Piezoelectric ceramics are smart materials commonly used in mechatronic devices and smart systems. Studies on the sensitivity of the electrical resistance of ceramic sensor materials based on zno tio 2 and sno 2 to humidity acetone ethanol ammonia and temperature are reported. Since ceramics exhibit a number of specific characteristics that enable their cost to become lower and their reliability to increase they have occupied a significant position in sensor technology.