I have received my new OWL 640 Mini Vis-SWIR camera with its IR KOWA 1″ 25mm/F1.4 optic. The camera is optimized for the 0.6 to 1.7 micron waveband and was selected because of this SWIR waveband extending into the visible. On the image below, the quantum efficiency (rate of electron conversion per photon received) of the InGaAs (Indium Gallium Arsenide) camera sensor is displayed and spans from the visible spectrum up to the mid-SWIR (where thermal effects due to the heating up of the electronics start to kick in).
The camera is small and could possibly be used in the airborne hyperspectral imaging tests that we will do later in this project. The sensor resolution is 640 x 512 (VGA) and the pixel dimension is 15 microns.
The Camera Link connection directly interfaces into an PCI-e board in the PC. I will not be using the camera with this setup because I want run it either from a laptop or from a Raspberry pi 4. As a result, I will be using a CAMPORT Euresys CL2USB3 (see image below) to control it from the USB3 port.
The control interface will be developed in Python, and the camera functions such as exposure time, camera gain, binning etc… will be accessed via the serial port of the camera.
Here is a first Infra-red picture of me.
On the IR picture below, I am holding a glass of water (hum… yes it is) in front of my eyes. Due to the water absorption, at a wavelength band centered on 1450nm, the glass appears to be opaque!
We are used to imaging in the visible where the glass and the water are totally transparent. The spectrograph, which has been described in the previous post, will look at imaging and quantifying the water absorption in the vicinity of this absorption band to be able to extract the moisture content.