A project was presented that instrumental design of an economical CMOS microscope image sensor. A high
performance, low price, black-white camera chip OV5116P was used as the core of the sensor circuit; Designing
and realizing peripheral control circuit of sensor; Through the control on dial switch to realize different functions of
the sensor chip in the system. For example: auto brightness level descending function on or off; gamma correction
function on or off; auto and manual backlight compensation mode conversion and so on. The optical interface of
sensor is designed for commercialization and standardization. The images of sample were respectively
gathered with CCD and CMOS. Result of the experiment indicates that both performances were identical in several
aspects as follows: image definition, contrast control, heating degree and the function can be adjusted according to
the demand of user etc. The imperfection was that the CMOS with smaller field and higher noise than CCD;
nevertheless, the maximal advantage of choosing the CMOS chip is its low cost. And its imaging quality
conformed to requirement of the economical microscope image sensor.
KEYWORDS: Light emitting diodes, Microscopes, Control systems, Light sources, Voltage controlled current source, Lamps, LED lighting, Light, Field effect transistors, Imaging systems
The design of microscope field illumination system based on LEDs is demonstrated in this paper. An LED light source,
drive circuit, control circuit and collecting lens are included in this system. The light source adopts high brightness white
LED array or high power White LED; Area, brightness and angle of the high brightness white LED can be adjusted for
the different need of angle of view; Brightness regulation of the high power white LED adopts Pulse-Width Modulation
to make the output of brightness is of linearity and stability. In the same condition, the image collected at the LED
illumination system compared with the image collected at traditional illumination system. The results shows that this
system is of high performance, uniform illumination, good stability; This system is available to satisfy different micro-object
and different microscope magnification, and is of great practical value.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.