Synthesis of feedback control unit for beam microbalances

Gronlund, F

doi:10.1088/0022-3735/22/11/001

Cited by 3 publications

(3 citation statements)

References 4 publications

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“…After assembly, the force measurement system was controlled. There have been more studies on the control for null balance than on the mechanism analysis and the design [9][10][11][12][13][14][15]. To control the displacement, the digital PID method was applied to the system.…”

Section: System Characteristicsmentioning

confidence: 99%

“…Thus, even though mechanism analysis and design are needed to improve system performance by heightening the resolution, broadening the measurement range, and eliminating the corner loading error, papers on mechanism design related to the null balance type force measurement system, especially on the parallelism error analysis, have not been found in the literature. Several papers on control and filter design have been reported [9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

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Parallelism error analysis and compensation for micro-force measurement

Choi

Kim

Woo

et al. 2003

Meas. Sci. Technol.

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The null balance method for micro-and nano-force measurement is widely used in various precision industries. A parallel spring and a lever mechanism are designed and analysed for an electrostatic force balance by the null balance method. Various design parameters are required to obtain high resolution, a large measurement range, and fast response. The corner loading error is one of the most dominant error sources that should be removed. A parallel spring known as the Roberval mechanism, used in the micro-weighing device, can be used for one-axis force measurement since it is very sensitive to the vertical direction force, but insensitive to other force components. However, precise control of parallelism to below a micrometre is required not only to compensate for but also to remove the corner loading error. In this paper, the effects of the parallelism error have been analysed using the Lagrange method and verified by the FEA method. It was found that parallelism control by the proposed precise compensation mechanism enables the simultaneous elimination of and compensation for the corner loading error.

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Section: System Characteristicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Parallelism error analysis and compensation for micro-force measurement

Choi

Kim

Woo

et al. 2003

Meas. Sci. Technol.

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show abstract

“…However, a few papers on control and filter design for the null balance type microweighing systems were found in the literature. Several structures and ideas regarding their modification were proposed in patents [5][6][7][8]. The paucity of reports on mechanical design procedure encouraged us to propose the present design.…”

Section: Introductionmentioning

confidence: 99%

Solid-State Glucose Sensor Using LaF₃-Based Transducer

Miura

Matayoshi

Yamazoe

1989

Jpn. J. Appl. Phys.

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The null balance method is used for precision force measurement in the precision industry in order to overcome the limitations of the load cell. The performance of any micro-weighing device is determined by the design of the precision mechanism. Such a device should be designed for high reproducibility, large measurement range with high resolution and fast response characteristics. The device consists of a displacement amplification mechanism and a parallel spring. The mechanism proposed here is analysed against the design specifications. The mechanism was designed for a resolution of 0.1 mg, a range of over 100 gf and a settling time of less than 1 s. The results of this design were verified by simulation and by experiment.

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