Brillouin spectrum of a silicon wafer, acquired using a camera cooled only at -5°C, limiting the exposure time to 10 seconds because of the dark current. The spectrum was averaged 50 times (thus accumulating the noise associated with 50 read-out events). A deeper cooled camera will be used in future work to allow for longer exposure time, which will result in a much higher signal-to-noise ratio with only a few minutes of total exposure. Nevertheless, even with a short exposure time, the spectrum in Figure shows the great potential of the system.