Saya baru baca artikel dari kompas-online mengenai perangkat yang dapat membuat polisi melihat tembus dinding. Alat itu namanya Radar Range-R. Katanya bisa dipake buat ‘hostage-situation’, pencarian korban bencana-alam, dll. Ada yang bilang harga jualnya sekitar USD 6000.

Tadinya, saya pikir hanya kamera thermal (modif) saja yg mampu melihat tembus dinding. Pemikiran itu pun setelah 4 tahun saya sering berkutat dengan kamera thermal merk FLIR.

Sedikit penjelasan dari website si Radar Range-R (copy-paste):

“RANGE-R is a handheld sensor capable of sending Radar signals through the walls and locating people inside buildings. It is powered by 4 AA batteries and weighs less than 1.5 lbs (~680gr).

The basic RANGE-R concept of operations is shown. The sensor is held against the wall and activated via a pair of buttons (one hand operation). A series of Radar pulses is transmitted through the wall. The pulses are reflected from objects inside the structure.

RANGE-R uses a form of Radar known as Doppler Radar. In Doppler Radar, a radio frequency (RF) signal is transmitted, strikes a target and returns to an RF receiver. If the object is moving, the frequency of the signal is altered. RANGE-R uses a type of Doppler Radar known as Stepped Frequency Continuous Wave (SFCW) Radar, where specific frequencies are emitted in a controlled fashion.

RANGE- R will penetrate most common building wall, ceiling or floor types including poured concrete, concrete block, brick, wood, stucco glass, adobe, dirt, etc. However, It will not penetrate metal.”

sumber:
http://www.range-r.com/tech/theory.htm
http://www.wkyc.com/story/tech/2015/01/19/police-radar-see-through-walls/22026067/