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Joined: 11-Feb-2011
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Quote rahulsivan07 Replybullet Topic: hidden camera detector circuit
    Posted: 27-May-2011 at 1:24pm
hidden camera detector circuit mini projects ideas

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Quote Krishna_Sridhar Replybullet Posted: 20-Jun-2011 at 12:17am
Hey rahul....with personal security issues popping up often nowadays, your project remains a good choice. If you are still looking for ideas to implement, here is one for you:

Detecting hidden cameras can be done by using the principle of optical augmentation.

This technical jargon refers to the phenomenon where light reflected from a focused optical system such as a video camera is reflected along the same path as the incident light. This means that if a hidden camera is illuminated and viewed by the detector then a strong reflection from the target camera will reveal its position to the user.

This phenomenon can be implemented by using a ring of ultra-bright LEDs arranged around a viewing port. When a user scans a room looking through the viewing port a hidden camera appearing in the field of view will brightly reflect the light from the LEDs.

Operation :

One could simply look through the viewing port in the detector and depress the button to activate the LEDs.

Slowly scan areas where hidden cameras are suspected and look for bright reflected spots. Remember most hidden video cameras use pinhole camera lenses so the spot you are looking for could be small. If you see a suspected camera move your vantage point slightly.

If the location of the reflection moves as you move then this is not a camera. If the location of the reflection does not move then it is highly likely that you have discovered the optics of a hidden camera.

For example, consider a wall clock that has a domed plastic cover and a pinhole camera concealed under the numeral six on the clock face.

When the detector is used to scan the clock a reflection will be noted where the camera is located beneath the six and a reflection will also be noted from the plastic cover. However if you move your vantage point just a little you will notice that the location of the false positive reflection point from the plastic cover will move while the reflection from the camera remains under the numeral six on the clock face.

Happy Projectin

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