Body detector is a valuable technology tool that can be used to perform for the security system such as Alarm System Using Body Detector. Body detector is an application that  relies only with the existence of electrical field that surrounds the human body. Body detector is a device that can detect the existence of human body for a certain wide range of area.  Body detector security system makes all services that relate to information simpler, safer, cheaper and portable.

Body detector relies on the fact that the human body itself possessed a fairly large order of capacitance to the ground (earth) and that if such a body approaches the positive plate of a given capacitor, its value will rise. Then, one could find a means to detect such an increase in capacitance, one means of detecting the presence of a human body.

Every living human body is surrounded by an electric field, which may potentially be detected at a few meters’ distance. Even if this can only be detected at a distance of a few centimeters (as opposed to millimeters), the applications are legion. This is really important to make sure the area is safe and to avoid strangers from gain access in the area.

 The phenomenon of capacitance is entirely dependent on the existence of electric fields. If, therefore, a human body should approach the positive plate of a capacitor, the body’s electric field will cause the value of the capacitor to rise. In the Body Detector circuit, this is detected by means of an RC (resistance-capacitance) oscillator. As the value of C rises, so the frequency of the oscillator drops. All that remains is to detect this drop in frequency to obtain some interesting results. While in theory its operation is dependent on the electric field which surrounds the human body, in effect it would seem that an invisible field surrounds the sensor – somewhat like the “invisible” defense shields. It would appear, therefore, that as a human hand (for instance) enters this invisible field, an alarm is triggered.

In this final project, the main objective is to create a system that would detect human body existence . Body Detector provide an effective security system by having a sensor that is completely vandal proof and tamper-proof. One could not come near it with a pair of clippers or a similar instrument because it is immune to alternating current (ac) fields and it will also detect body presence on the other side of variety of materials including the insulators.

Body detector is a valuable technology tool that can be used to perform for the security system such as Alarm System Using Body Detector. Body detector is an application that  relies only with the existence of electrical field that surrounds the human body. Body detector is a device that can detect the existence of human body for a certain wide range of area.  Body detector security system makes all services that relate to information simpler, safer, cheaper and portable.

Body detector relies on the fact that the human body itself possessed a fairly large order of capacitance to the ground (earth) and that if such a body approaches the positive plate of a given capacitor, its value will rise. Then, one could find a means to detect such an increase in capacitance, one means of detecting the presence of a human body.

Every living human body is surrounded by an electric field, which may potentially be detected at a few meters’ distance. Even if this can only be detected at a distance of a few centimeters (as opposed to millimeters), the applications are legion. This is really important to make sure the area is safe and to avoid strangers from gain access in the area.

 The phenomenon of capacitance is entirely dependent on the existence of electric fields. If, therefore, a human body should approach the positive plate of a capacitor, the body’s electric field will cause the value of the capacitor to rise. In the Body Detector circuit, this is detected by means of an RC (resistance-capacitance) oscillator. As the value of C rises, so the frequency of the oscillator drops. All that remains is to detect this drop in frequency to obtain some interesting results. While in theory its operation is dependent on the electric field which surrounds the human body, in effect it would seem that an invisible field surrounds the sensor – somewhat like the “invisible” defense shields. It would appear, therefore, that as a human hand (for instance) enters this invisible field, an alarm is triggered.

In this final project, the main objective is to create a system that would detect human body existence . Body Detector provide an effective security system by having a sensor that is completely vandal proof and tamper-proof. One could not come near it with a pair of clippers or a similar instrument because it is immune to alternating current (ac) fields and it will also detect body presence on the other side of variety of materials including the insulators.