Frequently
Asked 
Questions

Monochromator is useful tool for diagnosing detectors, molecule-based components and bio-samples. Sometimes, laser components are used for these applications but the monochromator provides more safety for naked eye and reliable price. Especially, the monochromator is more convinient for choosing the wavelength and bandwidth of light without having to buy it seperatedly by wavelength.

If you want to use a spatial coherent light source, the laser is proper choice. But the other applications, the Monochromator is strongly recommended.

There are two concerns when choosing the pixel size of an image sensor. The first is the optical image quality of the lens system, especially its Nyquist bandlimit. The second is the sensitivity of the pixel which definitely depends on its size. However, these two concerns do not  align perfectly because smaller pixel can achieve higher resolution but worse sensitivity. To address this issue, image sensor companies have developed pxiel binning modes but they also have limitations as they only combine each color channel seperately. Another approach is to combine pixel signals after A/D conversion through digital or software processing. However, the pixel signal may have read noise after A/D conversion, so digital combining processing not only enlarges the signal but also amplifies the read noise. Therefore, the pixel size should be chosen based on the optical system and the desired object intensity you want to capture.

Literally the SEM is scanning electron microscope and TEM is transmissive electron microscope, so the preparation of sample is quite different. The sample of SEM needs to be coated with gold to drain electrons, on the other hands TEM sample needs to be making thin film type with few nano meter by using FIB milling.

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