SEISMIC SENSOR
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project report helper
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26-10-2010, 12:35 PM




.pdf   CI-03_Nov07.pdf (Size: 137.57 KB / Downloads: 302)

SEISMIC SENSOR


D. MOHAN KUMAR



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 straightforward. 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 nanofarads. Like a capacitor, it can store charge when a potential is applied to its terminals. It discharges through VR1, when it is disturbed.

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abhi.btps
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30-04-2011, 01:11 PM

whole minor project and implimentation report on seismic sensor
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seminar addict
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07-02-2012, 02:23 PM

SEISMIC SENSOR



.ppt   minor project seismic sensor.ppt (Size: 1.08 MB / Downloads: 94)
INTRODUCTION :-


The word seismic is derived from the Greek word, seismós, meaning shaking or quake.
A seismic sensor is a device that uses the piezoelectric effect to measure pressure, acceleration, strain or force by converting them to an electrical signal. 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.


APPLICATIONS :-



A seismic sensor senses pressure changes. It has a wide range of applications. Some are-
1. It can be used for security purposes at homes.
2. Farms can be protected from animals by employing this circuit around it.
Further applications:
With a little modification, the same circuit can be employed to various other usage.
Some are-
It can be used for the detection of intensity of earthquakes.
At homes and offices, it can be used in automatic light ON/OFF
Systems.


ADVANTAGES


There are advantages to the use of seismic sensor.

They can be adjusted to detect vehicular traffic.
If the soil & vegetation cover are restored to original
condition.
Some models are designed for use with photographic
or video equipments.
Seismic sensors are also used for the footprint
detection



 

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feddychamp
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#4
29-06-2012, 12:59 PM

to have an earthquake alarm what are the modifications that are needed to be employed in the current circuit sir??
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seminar flower
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15-10-2012, 03:49 PM

Seismic sensor


.docx   Seismic sensor.docx (Size: 12.22 KB / Downloads: 18)

ABSTRACT

Seismic sensor helps us 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.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 period of 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 buzzer starts beeping along with red light indication from LED2. Whenever a pressure change develops near the sensor, the circuit will be activated.
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