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Vibration Detector

Vibration Detector. Independent project by Akshay Dabherao ( cs12b1005) & Prashant Swami(ce12b1023). Basic Principle. The basic principle used in this setup is piezoelectricity.

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Vibration Detector

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  1. VibrationDetector Independent project by AkshayDabherao(cs12b1005) & PrashantSwami(ce12b1023)

  2. Basic Principle • The basic principle used in this setup is piezoelectricity. • It is a phenomenon of internal accumulation of charge in crystals in response to external mechanical force applied on it. :source(Wikipedia)

  3. Applications of piezoelectricity • Detecting & producing of sounds • Generating voltage • Microbalance • Ultrafine focusing of optical assemblies

  4. Material used: • The material used in piezoelectric element is lead zirconate crystal. • These crystals generate measurable piezoelectricity when they are deformed • about 0.1% of their original dimensions. • These crystals readily release the current when the orientation of crystal is disturbed by mechanical vibrations. • These signals are in turn given to IC 741 (Op-Amp)

  5. Material used • Op-Amp has two terminals • V+ (non-inverting) input & • V-(inverting) input • OpAmp is a difference amplifier so it amplifies difference between the inputs • Even if the difference is small the output can be as high as supply voltage(Vs) • Negative feedback is given to V- so as to make it a non inverting amplifier • Open loop gain of OpAmp is very high (nearly 100000)

  6. NPN transistor • NPN transistor is used as a switch in this circuit • When the base voltage is high the current in emitter and collector increases • Collector voltage will drop because of load resistance • This will act as a switch to trigger signals to IC 555 (timer IC)

  7. Mechanism: • These signals are in turn given to an Operational Amplifier(Op-Amp).The Op-Amp amplifies the current signal which in turn gives high output . • This high output from Op-Amp in turn will switch on NPN transistor and it will start conducting.

  8. Mechanism • When transistor conducts, it will trigger pin 2 of IC555(monostablemultivibrator). • IC555 will give high output to pin 3. • VR is used to adjust the sensitivity of the piezo element. • This element is kept in a metal box which will be buried inside the soil to detect seismeic vibrations.

  9. Advantages Disadvantage The piezo element can detect slightest vibrations to make it useful to detect seismic waves Useful, cheap and can be used for many applications It is difficult to monitor such a detector Piezoelement loses its efficiency after certain period of time

  10. THANK YOU

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