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Sensing Technologies: Magnetic, Piezoelectric & Infrared Motion Sensors

Discover how magnetic, piezoelectric, and infrared sensors work and their applications in various industries. Learn about the principles behind reed switches, piezo vibration sensors, and PIR motion sensors, and explore their functionalities and uses. From detecting magnetic fields to sensing vibrations and motion, these sensors play a crucial role in modern technology.

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Sensing Technologies: Magnetic, Piezoelectric & Infrared Motion Sensors

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  1. 感測器原理與應用

  2. 磁力開關 Magnetic Switch Reed Switch The reed switch is an electrical switch operated by an applied magnetic field. It consists of a pair of contacts on ferrous metal reeds in a hermetically sealed glass envelope. The contacts may be normally open, closing when a magnetic field is present, or normally closed and opening when a magnetic field is applied. The switch may be actuated by a coil, making a reed relay,[1] or by bringing a magnet near to the switch. Once the magnet is pulled away from the switch, the reed switch will go back to its original position. http://en.wikipedia.org/wiki/Reed_switch

  3. 磁力開關 http://www.seeedstudio.com/wiki/index.php?title=Twig_-_Magnetic_Switch

  4. 壓電震動薄膜 PVDF Piezo Vibration Sensor Piezoelectricity is the electric charge that accumulates in certain solid materials (notably crystals, certain ceramics, and biological matter such as bone, DNA and various proteins) in response to applied mechanical stress. The word piezoelectricity means electricity resulting from pressure.. http://en.wikipedia.org/wiki/Piezoelectricity Polyvinylidene fluoride (PVDF): PVDF exhibits piezoelectricity several times greater than quartz. Unlike ceramics, where the crystal structure of the material creates the piezoelectric effect, in polymers the intertwined long-chain molecules attract and repel each other when an electric field is applied.

  5. 壓電震動薄膜 PVDF Piezo Vibration Sensor • Applications • Vibration sensing in washing machine • Low power wakeup switch • Low cost vibration sensing • Car alarms • Body movement • Security systems

  6. 人體紅外線 PIR Motion Sensor A passive infrared sensor (PIR sensor) is an electronic sensor that measures infrared (IR) light radiating from objects in its field of view. They are most often used in PIR-based motion detectors. http://en.wikipedia.org/wiki/Passive_infrared_sensor All objects above absolute zero emit heat energy in the form of optical radiation (light). Usually this light is invisible to the human eye because body temperature radiates at infrared wavelengths, but it can be detected by electronic devices designed for such a purpose. The term passive in this instance refers to the fact that PIR devices do not generate or radiate any energy for detection purposes. They work entirely by detecting the energy given off by other objects.

  7. 人體紅外線 PIR Motion Sensor http://www.seeedstudio.com/wiki/index.php?title=Twig_-_PIR_Motion_Sensor

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