The collimation of the measurement point on the inner and outer diameters of a large workpiece is a key technology in large diameter measurement, and it is a measuring difficulty yet to be well resolved home and abroad. This paper applies highly stabilized light produced by laser collimator to collimate the photoelectric detectors on the two magnetic localize is each adhered to an end of the diameter of the piece, meanwhile, use the interferometer to measure the distance between the center of the two photoelectric detectors, and obtain the diameter by geometric computation. Both the theoretical analysis and the experiment showed that the method is practical, with relatively high precision, and the relative error of the measuring system was less than 5×10<sup>-6</sup>, which is superior to the traditional mechanical measurement.
This paper analyzed the principle relative twisting angle with optical fibre minor bend, and obtained a theoretical model on torque measurement of the torque. The problem of power supply and signal transmission is the key in the torque measurement of rotating system. The paper applies high-frequency radio influence power to realize radio power supply, applies DSP processing circuit, digital signal transmission circuit, to realize radio signal transmission, using computer for data processing. The application of loop leakage gap antenna array cable as the measuring carrier of rotating signals in the signal blind zone, continue a new best transmission path for the rotating signals. The results of the experiment show the sensor has a very good prospect of application. And it realizes the power monitoring of a rotating device, and pave the way for the automation and intelligence of the devices.
In this paper, optical trigonometry measurement principle and wok principle of linear CCD are introduced, which are based on to design optical focusing and imagery system with He-Ne laser instrument as illuminant. peripheral circuit of linear CCD is designed in theory and experiment. non-contact thickness measurement instrument is constructed, using CCD as photoelectric transformation element and microprocessor as the controller. The principle of measurement system is inclined trigonometry measurement principle and CCD is photoelectric transformation element. The time order driving circuit of CCD is designed.