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首页> 外文会议>International Conference on Control, Computing, Communication and Materials >Ultra high sensitive digital electromagnetic balance for measurement of weights in microgram: Design and experimentation
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Ultra high sensitive digital electromagnetic balance for measurement of weights in microgram: Design and experimentation

机译：超高灵敏度数字电磁天平，以微克为单位的重量测量：设计和实验

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This paper proposes design of a weight measurement system capable of measuring weight in the range of micrograms to milligrams. The configuration of the system resembles with a conventional straw balance. Unlike straw balance the proposed system employs a force overcome technique. It does not employ any spring as that in case of other types of electromagnetic balance and any vibrating element present in some of the micro-weight measurement technique. The measurement system is digitally controlled using a microcontroller with digital display of measurement. Due to the light weight and extremely low friction, the proposed system becomes the highly sensitive, which can respond to weights in microgram level. The design comprises of a thin aluminum wire as a straw which is suspended by a fine wire and bearing arrangement. A micro-weighing pan is attached to one tip of the wire and a small iron piece is connected to other tip of the wire beneath which a small electromagnet is placed. The unknown weight in micro-weighing pan exerts a force at its end which is overcome by the electromagnetic force exerted on the iron piece present at the other end. Thus the force required to overcome the counterforce exerted by the unknown weight becomes a measure of unknown weight. When the force is overcome the pan is lifted and sensed optically. The electromagnetic force is proportional to the electromagnetic coil current which is again proportional to the DAC output, and hence the digital input of the DAC becomes the measure of the unknown weight. The proposed system was designed and practically implemented for the realization.
机译：本文提出了一种重量测量系统的设计，该系统能够测量微克至毫克范围内的重量。该系统的配置类似于传统的秸秆天平。与秸秆天平不同，建议的系统采用了一种克服力的技术。它不像其他任何类型的电磁天平一样使用任何弹簧，并且在某些微量重量测量技术中不使用任何振动元件。使用具有数字显示测量值的微控制器对测量系统进行数字控制。由于重量轻且摩擦极低，因此所提出的系统变得高度敏感，可以响应微克级的重量。该设计包括一根细铝线作为一根吸管，并由一根细线和轴承装置悬挂。微型秤盘连接到导线的一个末端，一小块铁片连接到导线的另一末端，在其下放置一个小型电磁体。微秤盘中的未知重量会在其端部施加一个力，该力可通过施加在另一端存在的铁片上的电磁力来克服。因此，克服未知重量所施加的反作用力所需的力变为未知重量的量度。克服力后，将锅抬起并进行光学感应。电磁力与电磁线圈电流成正比，而电磁线圈电流又与DAC输出成正比，因此DAC的数字输入成为未知重量的量度。所提出的系统是为实现而设计并实际实现的。

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