11 megapixel bottom-mounted TEM camera
The QUEMESA provides everything expected of a high end TEM CCD camera today: the extremely high resolution, very high sensitivity, superior contrast, high frame rates, and a large ﬁeld of view. These superior properties make the QUEMESA the ideal choice both for biomedical and materials science applications. The most satisfying aspect of this CCD TEM camera is that the TEM itself is now the only limiting factor with regard to resolution and sensitivity for most current TEM applications — no longer the camera.
High sensitivity and contrast at optimal resolution are the requisite ultimate goals for any TEM camera system. Every single photon generated in the scintillator per incident electron is of importance. The camera scintillator needs to be optimized to achieve the maximum signal from the pear shaped interaction volume. This is done by matching the effective pixel size through optimization of scintillator thickness. The QUEMESA camera system does this perfectly. Bringing scintillator thickness and pixel size into ideal correlation with one another ensures the maximum number of photons is detected. This guarantees an outstanding image.
The 2:1 ﬁber optical taper provides the highest quality. This increases the effective pixel size to 18 µm x 18 µm. In combination with the optimized scintillator thickness, this ensures optimal resolution and sensitivity. The taper provides a further beneﬁt — an extremely large ﬁeld of view for a bottom mounted TEM CCD camera. Its dimensions are almost comparable to the photo plate size of most current TEMs.
The QUEMESAs fast single port read out supports high frame rates of more than 12 fps, making it much more convenient to scan and focus on the PC monitor. The use of single port readout ensures a homogeneous CCD response over the whole readout area. Even when in the highest quality mode (full resolution) the camera provides more than 2 fps. This camera provides superb dynamic range and sensitivity no matter which resolution mode is employed. Due to highly efﬁcient conversion of primary electrons in the scintillator and optimized electronics design, the QUEMESA system gains a near perfect signal-to-noise ratio, resulting in very high sensitivity. This enables you to view your samples on your monitor at beam intensities so low it would normally prevent seeing an image on the TEM viewing screen. The ﬁnest detail is still shown perfectly in the camera image.