Advanced Materials Research Vols. 655-657

Abstract: Gas monitoring has been the most important project in coal mining, and the main basis of gas is CH4. As a result, it is fatal to develop a safe and highly sensitive CH4 sensing system to detect CH4 concentration real-time. Moreover, signal process system is important for this sensing system. The novel signal process system was proposed in this paper, and phase lock amplifying and signal sampling processing technology was utilized to monitor CH4 concentration steadily and reliably. The experiment results indicated that the steady is 0.4%, and relative error is less than 0.02%. So this signal process system is feasible and effective, and can meet the requirement of technology

Abstract: To meet the requirement of fiber current transformer, special display instrument was deigned. SCM and advanced signal process technology were adopted in the instrument, so that the output voltage signal of low voltage terminal can be utilized by instrument to display measured busbar current value real-time. Besides, section linearization and distinguish calibration methods were adopted to improve measurement precision of display instrument. The experiment results indicated that this instrument has virtues of reliability, high precision and low cost, importantly, it can come up to the 0.2 standard. So we can draw a conclusion that this instrument can meet the industrial requirement for display instrument.

Abstract: A straight-line trajectory tomography method, based on multiple tilted X-ray cone-beams formed by multiple sources and detectors, is investigated. In this method, multiple cone-beams are fixed and tilted at different positions and only the object translates along a straight-line trajectory. This kind of imaging method may have potential applications in industry testing and security inspections. As is known, projection data from a straight-line trajectory based on single cone-beam are incomplete and their reconstruction suffers from a limited-angle problem. The proposed straight-line trajectory tomography method based on multiple tilted X-ray cone-beams can be used to compensate these deficiencies. To reconstruct images, algebraic reconstruction technique (ART) algorithm is deduced. Numerical simulations validate our method.

Abstract: To improve the precision of the test device for some airborne thermometer system, the hardware structure and the software flowchart of auto-test instrument for airborne temperature indicator were introduced. The 89C52 single-chip computer is used in the test instrument. The CPU、A/D、 D/A and I/O boards are assembled as a cascade structure. By using the technologies of the advanced chip and Lab Windows / CVI 5.0, the instrument’s precision and flexibility are greatly enhanced. The test results show that the test resolution is 23Bit, the output electric current is 10mA, the precision is ±0.01mV.

Abstract: To improve the efficiency and accuracy of porcelain appearance evaluation, a kind of automatic evaluation system was presented, which composed with industrial cameras, USB(Universal Serial Bus) data acquisition card and step motor etc. The software was mainly developed with C# language. Modules such as image pre-processing and evaluation algorism etc, were developed with matlab program language. Communication between C# program and matlab program was implemented with component technology. Experiments with bowls show that the system can conveniently evaluate the porcelain by its appearance and the result is accurate.

Abstract: It is studied that a great proportion of traffic problems lies in vehicles’ steering system, and the maximum steering angle decides their steering capability and their minimum turning radius. The measuring principle of rapid measuring system, and the automatic tracking principle of measurement system have been analyzed in the paper. Also, the infrared tracking, the measuring plate positioning, the calculation of minimum turning radius, and the processing method of the test results have been described in detail. It is proved that the automatic automobile steering angle detecting system has reached the general requirements both in detection resolution and the measuring accuracy.

Abstract: Polarization ratio models are key problem for ocean surface wind field retrieval from HH polarization SAR images. This paper studied deeply on various polarization ratio models, and carried on comparison analysis and error analysis about them. We analyzed influence of incidence angle, azimuth, and wind speed for polarization ratio. By using true measurement of polarization ratio, we statistically valuated ability of various polarization ratio models, and proposed the best choice of polarization ratio models. Our research has guide meaning for using polarization ratio models reasonably.

Abstract: Based on the detection requirements of surface and sub-surface of micro steel ball, control system of defect scanning is studied, aiming at the problem of unfolded surface of steel ball, STC89S52 microcontroller is considered as the control core, then the feasible method of speed and direction control of step motor that driven by detection device, and hardware interface circuit and design of software solutions of the system are put forward, principles of unfolded surface of steel ball and control system of defect scanning and signal about defect scanning are analyzed, then the result are verified valid through the experiment. The results indicate that unfolded mechanics could be driven and flawed steel balls could be detected by the system of surface scanning of micro steel ball, which meet the design requirements.

Abstract: In the present work, investigations by high frequency resonance technique for diagnosis of defect frequencies of linear motion unit are reported. Raw vibration signature of the moving parts at different speeds of operation has been demodulated. Envelope detected spectrum is analyzed to evaluate various defect frequencies and their energy levels. Experimentally evaluated frequencies are compared with theoretically determined defect frequencies. These frequency values and their energy levels are used to monitor intrinsic condition of linear motion unit as well as to establish severity of existing/developed defects on the LM guide and inside the LM block. Relative comparisons of linear motion units of the same type are made at various operating speeds under identical conditions of operation on the basis of identified defect frequencies and severity of defects.

Abstract: In order to meet the demand of diagnostic equipment on the intelligent network testing for inertial confinement fusion (ICF) research, an intelligent X-ray framing camera system is designed and implemented. Embedded PC/104 bus masters the whole system and realizes human-machine communication and networking. The self-designed multifunction interface card can realize the camera work point setting, mode switching and environment monitoring. The specialized software and hardware make the camera has the ability of self-diagnosis and automatically adjust work point. The system improves the stability, reliability, consistency and precision of the camera. It is significant for furthering analysis the ICF issue.