The Laser Monitoring System ( LMS ) has to be used when access to a room totally impossible.
The laser transmitter, with its beam being in the invisible infrared waveband, has to be directed to a window of the room to be monitored. A certain part of the laser beam will be reflected by the window-pane. The receiving part of the LMS picks it up and converts it into electric signals, which after filtering – are amplified and fed into headphones and/or recording devices.
The full system essentially consist of:
- Laser transmitter and a corresponding receiver being placed into one housing only
- Tripod for mounting the transmitter/receiver-unit
- Recording, amplifying and equalizing unit being housed in an ordinary briefcase
The laser transmitter and receiver are built in a special splash-proof aluminum housing, allowing the system to be operated in inclement weather conditions. The “ State of the Art “ semiconductor laser mechanically is extremely robust and due to low power consumption, a running time of approx. 50 hours can be achieved by each battery set.
Laser Monitoring System |
| A) Transmitter |
| Laser output power 10mW max. | Laser wavelength 880 nm | Optical divergence 0,5 mrad |
| B) Receiver |
| Optical system 135 m, 1:2.8 | Laser Class 3 laser |
| C) Transmitter / Receiver unit | - mechanical specs. |
| Dimensions 130 x 220 x 60 cm | Weight 1,6 kg | Power supply 4 x UM - 2 | Connectors socket for wired connection to amplifier |
| D) Amplifier / Electronic Unit |
| System Filter amplifier | Max. gain 100 dB | Equalizer type 5 band graphic | Filter frequencies 300,600, 1200, 2400, 4800 Hz | Adjustments range +/- 10 dB | Output phone 4-16 Ohm, 100 mW | Output recording 200 mV at 50 KOhm | Power supply 4 x UM – 1 or mains 110 – 240 VAC | Battery time up to 50 hours | Weight 8,2 kg | Dimensions 25 x 28 x 5 cm |
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