When discussing and demonstrating the Distek Opt-Diss 405 fiber-optic UV spectrophotometer, many customers have asked what type of detector the system uses to capture images in the UV spectrum.
The Opt-Diss 405 utilizes a single charge-coupled device (CCD) as the system’s detector. CCD’s were first developed in 1969 at AT&T’s Bell Labs, and have been applied most commonly for usage in digital cameras.
The basic concept behind the CCD is that light falls upon an array of capacitors (the photoactive region), causing each capacitor to accumulate a charge proportional to the light intensity at each location. A control circuit is then able to convert these charges into a sequence of voltages, which can then be converted into data by digital devices. And by cooling a CCD (with the Peltier cooler, in the case of the Opt-Diss 405), the device becomes sensitive to the UV region of the electromagnetic spectrum.
With the Opt-Diss 405, if the user clicks on the “View Image” icon or command in the software, one can actually see a digital representation of the CCD, and where the light from each channel falls on the detector (pictured below).
Using a CCD, the Opt-Diss 405 is able to acquire the entire UV spectrum simultaneously with every image collected.