This paper presents a new method for ultrasonic ranging. It consists on continuously transmitting a signal composed by multiple sine wave segments, each containing an integer number of periods. The frequency of each segment is different from the adjacent segments, but close to the transducer resonant frequency, to minimise the filtering effects of the system. The transmitted and received signals are cross-correlated to determine the time-of-flight (TOF). Parabolic interpolation on the cross-correlation’s magnitude is used to increase the accuracy of TOF estimation. High measurement resolutions and good noise immunity is achieved.

Replacing a lamp in an outdoor installation, like roadway lighting, requires a lot of time and money. The proper maintenance strategy of installed lighting-system components is an essential element in ensuring that systems perform as designed and consequently ensure the safety. The paper presents a method for evaluating the residual life of High Pressure Sodium road lamps and for detecting incoming fault. The proposed method is based on the frequency domain analysis of the lamp current that changes its harmonic content in consequence of the aging.

The application of modern electronic solutions and microprocessor technologies has significantly improved measuring methods and devices for instrument transformers accuracy testing. PC hardware and software application options in this filed of measuring techniques significantly increase reliability, efficiency and accuracy. This paper presents the role and importance of software application in instrument transformer accuracy testing that have been developed by the Electrical Engineering Institute “Nikola Tesla”.

The paper presents the technique of Virtual Instrument design to obtain Real-Time mode. Application of the ETS approach to configure Real-Time instrument is presented and its requirements pointed out. Design of the virtual spectrum analyzer using the ETS technique is described. Detailed analysis of the designed instrument, considering ability to work in Real-Time mode, is conducted. The comparison between the ETS solution and formerly examined, traditional, approach is performed. Conclusions about the abilities of ETS RT virtual instruments and their practical applications are presented.

A vision-based measurement system for the online inspection of automotive rubber profiles is described. The system determines a 3-D reconstruction of the rubber profile section and performs dimensional measurements. After a brief description of the whole measurement system, the main novelties are pointed out: the simple calibration procedure and the flexible tools allowing users to specify the dimensional measurements regardless of the type of the profile to be inspected.