外文翻译-------光电编码器的特性及应用(编辑修改稿)

外文翻译-------光电编码器的特性及应用(编辑修改稿)内容摘要：

on (below can see, in spring gravimeters measurement will have this kind of case). 5 图 3 增量光电编码器基本波形和电路 6 图 4 四倍计数方式的波形和电路 Figure 4 is a can prevent error and can improve the resolution of the pulse frequency subdivision circuit four times. Here, the function of memory is D flipflop and clock generator. Figure 4 shows, by every two D flipflop, so take in the clock pulse, the interval of two Q end (such as the corresponding B 74LS175 2, 7 foot) maintain two clock period, if both input status, said the change in, Otherwise, can according to the relationship between the changes from the party, which is to or backward output pulse. When a word because of high vibration in the 39。 39。 , 39。 low , will change between reciprocating alternate positive and backward pulse, the two counter on the number and replace them when they can eliminate the shadow ring (below instrument readings will involve this). Thus, the clock generator frequency of vibration frequency may be greater than the maximum. Can see from figure 4, a pulse signal of the cycle, four counts pulse. For example, the number of every lap pulse coder for 1000 produce four times the number of pulse frequency, and its resolution is 4000 for degree. Actually, this kind of sensor products will enlarge the output signal of photosensitive 7 ponents such as plastic circuit and sensor encapsulation testing ponents together, so just add subdivision and counts circuit can form a angular measurement system (74159 is 416 decoder). Application problem analysis and improvement measures Application problem analysis Photoelectric detection devices transmit and receive devices are installed in the production and use of exposed many defects, its internal factors have external factors, which is mainly embodied in the following aspects: Devices or accept device for mechanical vibration, caused by the shift or offset, receiving devices not reliable to receive light signals, but cannot produce signals. For example, Photoelectric encoder used in steel rolling speed regulation systems, because of photoelectric encoder is bolted directly in motor shell, photoelectric encoder shaft through hard shrapnal and motor rotor connections, because motor with load is a load of impact, while rolling steel rotor motor will have caused the shell and vibration. According to the mensuration, After steel time electricity encoder vibration velocity for mm/s, this can damage the vibration velocity of photoelectric encoder internal functions. A pulse, thereby causing instability in control system, or misoperation cause accidents. Because of photoelectric detection device installed in production, production environment factors in photoelectric detection devices not reliable work. Such as the installation position of high temperature, humidity, photoelectric detection device to internal electronic ponents characteristics change or damage. For example in continuous caster send tracking system, because of photoelectric detection equipment installation location near the slab, high temperature environment caused by photoelectric detection device signal or damage caused by accidents or production. Production site for all kinds of electromagic interference source photoelectric detection device, of interference, photoelectric detection device of output waveform distortion distortion occurs, the system maloperation accident or production. For example, Photoelectric detection device installed in the production equipment of the signal, the body to the control system of the cable transmission distances in 20100 meters, cable, although usually choose multiple shielded cable conductor, but due to cable capacitance between lines of resistance and impact plus and other cable laying together, vulnerable to all sorts of electromagic interference effect, thus causing waveform distortion, thus to drive system feedback signal and practical value deviation, and cause the system precision. Measures for improvement 8 Change of photoelectric encoder installation. Photoelectric encoder is not installed in motor shell, but in the motor based on a fixed bracket to independent installation photoelectric encoder, photoelectric encoder axis and motor shaft center must at the same level, two axis adopt soft rubber or nylon hose connection, to reduce the impact of photoelectric encoder motor load of mechanical shock. By this way after vibration testing, the vibration velocity to mm/s. Reasonable choice of photoelectric detection device, the output signal transmission medium by twisted。