We proposed heterodyne angle deviation interferometry (HADI) for angle deviation measurements. The phase shift of an angular sensor (which can be a metal film or a surface plasmon resonance (SPR) prism) is proportional to the deviation angle of the test beam. The method has been demonstrated in bubble and speaker’s vibration measurements in this paper. In the speaker’s vibration measurement, th...

The first accurate measurement of an intermolecular vibration of the water dimer is reported. Five vibration-rotation-tunneling (VRT) bands of the perdeuterated isotope, located near 84 cm-’ , have been assigned to the A 1 /E/B, tunneling components of the K, = O-0 and K, = l-0 subbands. The vibration involves large amplitude motion of the hydrogen bond acceptor and is assigned as the vs accept...

A surface meso-structure measurement and tactile device input vibration signal synthesis techniques are proposed. To measure the surface meso-structure, some photos are taken using a fixed camera with changing lighting incidence direction. A surface normal image is obtained from these photos. Then vibration signal as tactile device input signal is synthesized. Adding friction sound, the tactile...

This paper proposes one new type of speed measurement sensor using difference structure to solve the problem of measurement errors resulted by the vibration of low-speed urban maglev train. By the design of the detection coils and the signal detection circuits, the sensor could fulfills the requirements of rapid and accurate detection. The experiment results show that the speed measurement sens...

Condition Monitoring of rotating equipment has been a very important aspect in the field of maintenance engineering. There are various types of condition monitoring techniques, namely: Vibration Analysis, Oil Debris Analysis, Ferrography, Temperature analysis. Among all these techniques, vibration analysis have gained much importance in the field of condition monitoring because of its accuracy ...

This paper proposes a method for determining maturity levels of durian by using nondestructive vibration. The vibration is transferred directly through durian at a region between prickles located at the middle of durian. The measurement of frequency response from vibration of durian is performed by using laser doppler. The signal is processed for finding velocity of vibration, elastic constants...

However, the basic processes of measurement and analysis have remained essentially unchanged, just like the machines from which the vibration is measured. The results of the measurement and data analysis need to be compared with known standards or guidelines and decisions made as to whether the machine is acceptable for service or maintenance should be planned. Increasingly these processes are ...

Self-mixing interferometer is a suitable tool for implementing industrial sensors, with the advantages of optical techniques, such as high accuracy and contactless operation, but at potential very-low cost. This paper describes some techniques recently developed for realizing vibration measurements, based on different signal elaborations and with different performances and applications. Particu...

A dynamic profiler is presented that is capable of precision measurement of surface roughness in the presence of significant vibration or motion. Utilizing a special CCD camera incorporating a micro-polarizer array and a proprietary LED source, quantitative measurements were obtained with exposure times of <100 μsec. The polarization-based interferometer utilizes an adjustable input polarizatio...