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07-07-2010, 06:53 PM
Post: #1
project-seismic sensor
plz give some introduction to seismic sensor.....
18-09-2010, 04:39 PM
Post: #2
RE: project-seismic sensor
More Info About project-seismic sensor

This circuit simulates a seismic sensor to detect vibrations/sounds. It is very sensitive and can detect vibrations caused by the movement of animals or human beings.So it can be used to monitor protected areas to restrict entry of unwanted persons or animals.The circuit uses readily available components and the design is straight forward.A standard piezo sensor is used to detect vibrations/sounds due to pressure changes.

The piezo element acts as a small capacitor having a capacitance of a few nano farads. Like a capacitor, it can store charge when a potential is applied to its terminals. It discharges through VR1, when it is disturbed.

In the circuit, IC TLO71 (IC1) is wired as a differential amplifier with both its inverting and non-inverting inputs tied to the negative rail through a resistive network comprising R1, R2 and R3. Under idle conditions (as adjusted by VR1), both the inputs receive almost equal voltages, which keeps the output low.TLO71 is a low-noise JFET input op-amp with low input bias and offset current. The BIFET technology provides fast slew rates. Capacitor C1 is provided in the circuit to keep the differential input of IC1 for better performance.When the piezo element is disturbed(by even a slight movement), it discharges the stored charge. This alters the voltage level at the inputs of IC1 and the output momentarily swings high as indicated by green LED1. This high output is used to trigger switching transistor T1, which triggers monostable IC2. The timing periodof IC2 is determined by R7 andC5. With the shown values, it will be around two minutes. The high output from IC2 activates T2 and the buzze rstarts beeping along with red light indication from LED2.

Assemble the circuit on a common PCB and enclose in a suitable cabinet.Connect the piezo element to the PCB using single-core shielded wire. Enclose the piezo element inside a rustproof,small aluminium box. The piezo element should be firmly glued to theen closure facing the fine side towards the case. Fix the sensor assembly on the back side of a ceramic tile or granite tile with good adhesive. Fix the tile(or bury it in the earth) near the entrance with the sensor assembly facing downwards. Whenever a pressure change develops near the sensor, the circuit will be activated.

reference by
30-04-2011, 12:47 PM
Post: #3
RE: project-seismic sensor
project report on seismic sensor
02-05-2011, 04:38 PM
Post: #4
RE: project-seismic sensor
Measuring seismic activity is very essential for predicting earthquakes. Many such measuring devices are placed at various places of the world. But for a better prediction covering an entire area is very important. A collection of zigbee sensor networks can help to do this. Many zigbee enabled seismic sensors can be deployed at various places especially city under grounds to monitor seismic patterns.

The data collected by each sensor will hop through the zigbee network to reach a wifi station from where it will be transmitted to a server. Several such networks deployed across the world sending seismic activity to a central server can be set up. All this data on the server with proper analysis can help in predicting changes in seismic activity and may be and earthquake.
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