In the paper a result of hand fingers transillumination is presented. During experiments, an robot arm equipped with an optoelectronic system has been used. The object scanning was realized in the rectangular coordinates system. Optical radiation at the wavelength 880 nm was emitted by a high power LED to be supplied in pulse mode while a photodiode PIN was used as the photodetector. Both light source and photodetector were set into the special diaphragms in order to collect all ballistic photons. The signals obtained from the photodiode allowed determining the object optical attenuation occuring in particualr sites of the transilluminated surface in a form of two-dimensional image. Also selected examples of current modern transillumination applications in medical diagnostics are presented.
The paper includes discussion on the basic structures of analog signal separators with optoelectronic optocouplers with particular focus on the features significant to provide the linearity of transformation characteristic. It also includes the evaluation of transformation characteristic linearity of a selected optoelectronic current signals separator. For static transformation characteristics, determined experimentally, I0 = f(II) the nonlinearity and approximation errors were compared. Upon comparison of the value of such errors, conclusions were formulated on determining the optimum use of the separator's transmission abilities.
Wireless optical fiber links are the basic means of data transmission between movable objects. Radio links dominate in remote transmission. By means of open optical fiber links, it is possible to transmit data over short distances between objects. Depending on the technology used, it is possible to connect transmitting-receiving systems distant from one another by approximately twenty cm to twenty meters. Basic problems accompanying transmission to open optical links include the need for direct or indirect sensing of optical radiation from the emitter by the detector and the inherent propensity for interference. Among its advantages are: the possibility of obtaining greater data transmission speeds and an ease in changing direction, the difficulty posed to unwanted remote “viewing”, and the miniaturization of links. This paper presents basic open configurations of optical links used in data transmission with selected time-varying signals. Using remote transmission of data between a computer and mobile minirobot is shown.
In this paper, an optical scanner which can be used to investigate a 3D space, has been presented. Some main applications of that device, have been described. The diagram scheme of the scanner as well as a principle of operation and design of particular functional parts are shown. Major tasks of the software which is built in a controller and cooperates with the scanner, are presented. The methods on how create a geometrical model of environment to be useful for navigation of mobile robot, have been discussed. Some results of experiments are given.
Specificity of a software package composed of two parts which control an optoelectronic sensor of the computer-aided system made to realize the noninvasive measurements of the arterial blood oxygen saturation as well as some parameters of the peripheral pulse waveform, has been described. Principles of the transmission variant of the one and only noninvasive measurement method, so-called pulse oximetry, has been utilized. The software co-ordinates the suitable cooperation of an IBM PC compatible microcomputer with the sensor and one specialized card. This novel card is a key part of the whole measuring system which some application fields are extended in comparison to pulse oximeters commonly attainable. The user-friendly MS Windows graphical environment which creates the system to be multitask and non-preemptive, has been used to design the specific part of the programming presented here. With this environment, sophisticated tasks of the software package can be performed without excessive complication.