Quartz Enhanced Photoacoustic Spectroscopy for Detection of Improvised Explosive Devices and Precursors

Figure 3

Compact breadboard of the QEPAS sensor head showing the laser head and the optical cell assembled and some of the electronic boards implemented. All the electronics, including the lock-in board, the preamplifier, and the ADC board, were assembled, though they are not visible in the picture, since being hidden under the metallic plates.