CMOS Camera Module: JDEPC-OV05
cmos camera focal length is now calibrated at 152.39mm (camera focal eye to forward face of cuvette holder.)
Measurements between the slit to cmos camera eye are not as important as precise alignment of camera to DVD grating and DVD grating to slit entrance, so with this in mind, the camera is now at 40 deg relative to slit entrance and DVD grating is at same (40 deg) relative to cmos camera eye.
The ruling density of the DVD grating is 8.5 GB 0.36mm groove spacing, which equates to 2770 lines per mm, wavelength of 360nm. The slit width is now 0.16mm and a spectral bandwidth of 1.19nm, using the new Gillette razor blade design I made. Project box dimensions are: 190mm X 109mm X 55mm.
Slit width dimensions are: 25mm in length, Cmos camera from slit: 88mm Camera angle: 40 degrees DVD grating angle: 40 degrees. Entrance coupler for slit and cuvette holder: 44mm in Diameter.
Wavelength range = 353nm – 693nm (reliably)
I replaced the old JDEPC-ov04 webcam with the more recent modification from the same company, with the one you can purchase now from Plab store. The JDEPC-ov05 and removed its IR filter. I will be posting it's specifications here also, I preformed the same theoretical calculation for resolution below, with the new values of 0.16mm slit width and a new DVD grating of 2770 lines, using 532nm laser, as my resolution wavelength:
1 X 0.16mm X 2770lines = 443.2
R = 531.2/443.2 = 1.19
So I have a bandwidth now of 1.19 (nm), which I feel comfortable with. I used my portable laser as my calibration vehicle (which is very stable, so I trust it's FWHM value.)