Raziel
Dark Jedi Spymaster
Image Source: www.roosl.com/lasers.html
Intent: To create a useful tool for operatives
Development Thread: N/A
Manufacturer: InnoteQ
Model: Q Laser Microphone
Affiliation: Open Market / Spynet (MW version)
Modularity: No
Production: Limited
Material: Laser emitter/sensor
Weight: 2kg / 4kg (MW laser with power pack for thick walls)
Description: The latest in off-the-shelf surveillance equipment from InnoteQ. A laser microphone is a surveillance device that uses a laser beam to detect sound vibrations in a distant object. This technology can be used to eavesdrop with minimal chance of exposure.
Originally a Spynet product from Prototype Lab Q, it has been decided to manufacture a limited number for the spin-off firm InnoteQ. However, the most advanced variation is being kept in-house for operations against advanced defences.
The object is typically inside a room where a conversation is taking place, and can be anything that can vibrate in response to the pressure waves created by noises present in the room. The object preferably has a smooth surface. The laser beam is directed into the room through a window, reflects off the object and returns to a receiver that converts the beam to an audio signal. The beam may also be bounced off the window itself. The minute differences in the distance travelled by the light as it reflects from the vibrating object are detected interferometrically. The interferometer converts the variations to intensity variations, and electronics are used to convert these variations to signals that can be converted back to sound.
However, countermeasures exist in the form of specialized light sensors that can detect the light from the beam. Rippled glass can be used as a defence, as it provides a poor surface for a laser microphone.
The second variant is significantly more expensive and is not commercially available. This version uses a highly focused and more powerful microwave beam in order to fire the laser through ordinary building materials and bounce it off of internal metal objects such as heating ducts or filing cabinets. At this point the only defence is electromagnetically and acoustically isolating the interior of the structure.
OOC/ I have seen this done across a lecture hall to “listen” to a ticking clock. Very cool!