Technical information

ICT in the science department 1630 © CLEAPSS 2005
Analogue vs
digital display
The size of the display impacts significantly on the amount of detail visible to the
viewer. Some cameras have both an analogue and digital output. If the software
presents a reduced-size window with the digital display, it may be possible to
improve the size and clarity of the image if it is enlarged using the analogue
output instead.
Computer display
Image-processing software may be used to manipulate the image in order to high-
light particular features not discernible as a result of traditional staining methods
for specimens mounted on microscope slides. Once the technology is mastered,
users find that this feature of video microscopy opens up whole new possibilities
for teaching and learning.
Software
It is especially important to have user-friendly software that allows quick and
easy adjustments to be made during use. Unfortunately, some software provided
with digital microscopes and cameras is far from accessible. Before investing in a
particular system, try to arrange an extended demonstration by the supplier to
help in judging the quality of the software.
Power supplies
The microscope will require some sort of illumination, usually obtaining power
from the mains via a transformer or from a separate lamp. The presence of more
interconnected items increases the importance of taking care with trailing leads;
(see Power supplies and safety in section 16.6.2).
Storage and
convenience
As with other cameras and microscopes, the equipment is delicate and can be
expensive. Storage cases might be supplied or are available as options.
The time involved in finding all the correct leads and setting up the equipment
can deter some users from taking advantage of this technology. If the equipment
can be kept together on a dedicated trolley, all the accessories and leads can be
maintained ready for use.
Specifications of equipment for video microscopy
Once the type of equipment to be used has been chosen, it is helpful to check certain
specifications before choosing a model. (For microscope specifications, see sections
10.5.1 or 10.5.2.) Manufacturers and suppliers have different ways of presenting their
camera specifications and a number of technical details can confuse the relevant
information. The following specifications are worth considering.
Table 16.10 Camera specifications for work with microscopes
Specification Suitable for basic work Preferable for detailed work
Connection Make sure the output can be connected to your display equipment, preferably directly
but at least via an easily-available adaptor.
Resolution 640 × 480 pixels At least 1.3 Megapixels
Frame rate 15 fps 30 fps (preferably with at least USB 2 connection)
16.7 ICT installation considerations
Well-installed ICT equipment makes its use convenient and more likely. Where equip-
ment is time-consuming to set up for each lesson, or requires detailed technical know-
ledge to do so, people are more reluctant to use it.
16.7.1 Siting computers in the laboratory
Computers and their connections can obstruct practical work and may be adversely
affected by water or chemical spills. Idle hands may also fiddle with computers that
are not in use. The siting of computers needs to be the best compromise under local
circumstances.