Abstract
The article provides the results of the experimental research into the influence of different types of photo detectors of digital optical ministicks on their transformation function – the useful ministick signal as a function of the ministick control lever deviation value. The set problem was solved using experimental research methods. Circuits with a photo diode (PIN photodiode PD15– 21B/TR8 manufactured by Everlight company) and circuits with a phototransistor (phototransistor KP2012P3C manufactured by Kingbright company) were studied. An automated test bench was used for the research. The test bench allows setting the ministick rotation angle and the value of ministick lever deviation from the central position to the left or to the right. The influence on ministicks was set by the test bench software. Based on the test results the test bench software plotted a ray path diagram. The ministick signal quality was assessed in terms of resolution, accuracy, nonlinearity and hysteresis. The following results were obtained in the research. The ministick using a photo transistor as a photo detector ensures the output signal amplitude and resolution which exceed those of ministick with a photodiode by factor of 3.5 to 4. It allows using ministicks with a phototransistor for highprecision control of complex robotic systems, manipulators and aircraft, and for designing joysticks and unified humanmachine interfaces on their basis. The indices of precision, nonlinearity and hystere sis of both ministick types are comparable and meet the basic requirements applied to control devices. Thus, ministicks based on phototransistors can be regarded as the best in terms of the signal quality. Taking into consideration the circuitry, overall dimensions and the cost of hardware components which are identical for both photo detectors, ministicks based on phototransistors shall be considered to be more advanced switching devices.
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