• 제어로봇시스템학회논문지
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• 제9권12호
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• pp.1019-1025
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• 2003

We introduce a new auto-calibration/simulation method for a strain gage type transducer/signal-conditioner which guarantees the output linearity and compensates the error automatically. We design a micro voltage supply which is able to interface either AC or DC type excitation voltage. A new strain gage simulator is also designed. We make linearity output of the signal conditioner and can compensate error automatically with this new auto calibration/simulation method. The experimental results show that the error between the real value and the expected one is less than 1%.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2003년도 춘계학술대회 논문집
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• pp.1430-1433
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• 2003

Transducers, which are incorporated in control devices for fixed wing aircraft, land vehicles. and weapon systems were designed and manufactured by use of semiconductor strain gages. These transducers consist of three parts; flange mounts, sensing rods, and semiconductor strain gages. In this investigation, we designed cylindrical sensing rods with high sensitivity and developed installation procedures of semiconductor strain gages. The semiconductor strain gage has hish gage factor such that it can produce high resistance change in spite of low strain, but it is so small and fragile that one should handle carefully and sophisticated installation method is needed for good performances. The prototype transducers are manufactured, and then tested about three important factors: sensitivity, linearity, and hysteresis. We got results or 0.084 V/N sensitivity, 0.2% nonlinearity, and 0.5% hysteresis.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2011년도 춘계학술대회 논문집
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• pp.1171-1172
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• 2011

• 한국항해학회지
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• 제21권3호
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• pp.49-54
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• 1997

It is very important to measure and monitor hull stress which is caused by a buoyant force and a weight of cargo for safety of ship. However, an exact measurement of hul stress, using the traditional strain gage which is made of metal or semiconductor, is very difficult, because a ship would be exposed by the severe temperature environment of $-20 ^{\circ}C$ to $80 ^{\circ}C$. This paper propose a new concept strain gage which can improve accuracy and compensage effectively affects due to temperature. The strain gage is consists of two parts. One is the Hull Deformation Amplifier which introuce several lever and link system, and another is a transducer converting distance into voltage signal. The HDA measure the amount of deformation and amplify it. And a lever and link system of the HDA is introduced for compensating temperature deformation by installing in perpendicular direction without stress. This paper also reports on the results of the experiments to verify linearity of the strain gage.

• Journal of Biosystems Engineering
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• 제18권4호
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• pp.371-381
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• 1993

Threshing operation is performed by impact, compression and friction forces inside the thresher. These values should be appropriate to the crop condition to enhance the threshing and separating efficiency and to decrease the grain damage. To analyze the threshing process inside the rasp-bar type thresher, impact, friction and compression forces were measured using transducers with strain gage circuits. To measure the impact forces and friction forces between the rasp-bar and crop, full bridge strain gage circuit was built on the rasp-bar holder. To measure the compression forces and circumferential friction forces between the concave and crop, two sets of full bridge strain gage circuits were built on the T-type concave transducer. Threshing work of wheat crop with 12% of moisture content was performed at 3 levels of compression ratio and with 3 replications. Each transducer could not measure the exact forces continuously because the transducer oscillates with the forces. However they could measure maximum forces and force distribution according to the time. Average friction coefficients between crop and concave was 0.61 not showing any significant difference according to the compression ratio. Average acceleration of the crop in the cylinder appeared from $70.6m/s^2$ to $140.8m/s^2$ according to the compression ratio. The velocity of the crop at the exit of the cylinder appeared from 10.7m/s to 15.0m/s according to the compression ratio.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2009년도 하계학술대회 논문집
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• pp.245-246
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• 2009

정전용량형 후막 스트레인 게이지(piezocapacitive thick film strain gage)는 세라믹 ($Al_2O_3$)을 주 원료로 하는 지지대(약 5mm)와 다이어프램(약 $300{\mu}m$) 그리고 가드 링으로 구성된다. 전극 판은 도전성 페이스트를 이용하여 지지대와 다이어프램에 형성되었으며 극판 사이에는 유전체 메이스트를 사용하여 스크린 인쇄로 후막을 형성하였다. 극판 사이의 가드 링 두께는 약 $30{\mu}m$정도로 다이어프램의 변위 최대값을 유지시키는 데 필요한 간격이다. 따라서 정전용랑형 후막 스트레인 게이지는 지지대를 중심으로 다이어프램에 압력 (0.5~1.0bar)이 인가될 때 변위를 발생시키면서 커패시터 값이 압력의 크기에 따라 비례 특성을 가지고 변화하는 것을 이용한 것이다. 압력이 없을때 초기값은 35pF~40pF 정도이고 정격압력의 최대치를 인가시켰을 때 약 55pF~55p를 나타내었다.

• 비파괴검사학회지
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• 제28권2호
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• pp.217-224
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• 2008

트러스는 교량이나 건축물 설계 등에 많이 사용되는 구조물로서 기본적인 설계요소이며, 설계자는 이러한 구조물의 원리를 완전히 이해하여 설계에 적용할 수 있어야 한다. 본 논문에서는 트러스 구조물의 힘을 기본역학에서 예측되는 오차범위 이내로 실험법으로 측정할 수 있는 기구설계 방법을 제시하였다. 상용으로 제작된 재래식 변형률 측정 장치는 고가이고 복잡하므로 구조를 이해하기가 어려우므로 본 측정기구에서는 휘트스톤브리지 회로를 적용, 스트레인 게이지 및 A/D 변환기 조립하여 하중과 변형률을 쉽게 측정할 수 있도록 하였다. 제작된 기구를 이용하여 구조물에 하중을 가하여 변형률을 측정하였으며, 측정결과를 이론적으로 예측한 값과 비교하여 실용성을 입증하였다. 이 측정 기구는 저렴한 값으로 제작할 수 있으며, 크기가 작아 탁상에서 교육용 실험 및 실습 장비로 적합할 것으로 사료된다.

• 제어로봇시스템학회논문지
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• 제5권8호
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• pp.941-947
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• 1999

As pressure transducers are employed in many fields such as production facilities, test facilities vehicles and industrial machinery, there is an increasing need for high precision measurement of pressure without any calibration or maintenance. In this paper, we discuss the development of a smart thin film pressure transducer which is highly suitable for a precise measurement of pressure. The smart functions include automatic zero tracking, automatic span adjustment, temperature compenstion, continuous self-diagnostics for faults (open strain gages, abnormal data, incorrect A/D conversion, and overpressure), data memory and multi-drop communication with PC

• 한국자동차공학회논문집
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• 제4권1호
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• pp.75-85
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• 1996

The gas pressure acting on the rings in internal combustion engine influences the friction, wear and HC emission. In order to understand their characteristics, it is necessary to measure the interring gas pressure during engine operations. In this study, miniature type pressure transducer was developed to measure inter-ring gas pressure. And measurements of cylinder and inter-ring gas pressure were made on a gasoline engine running at full and part load conditions. Finally the characteristics of inter-ring gas pressure variation during engine operation were obtained form analysis of measured date.

• Journal of Biosystems Engineering
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• 제5권2호
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• pp.40-57
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• 1980

The aim of this study was to promote extensive use of strain gage for accurate measurement in the area of farm machinery research. The results are summarized as follows. 1. Although many strain gate transducers commercially available such as load-cells , accelerometers and pressure transducers have been used in the area of farm machinery research, many types of transducers had to be developed due to the inadaptability or high cost commercial transducers, in many instances. 2. A strain -gaged cantilever beam could be used as a good educational material to demonstrate the methods of Wheatstone bridge arrangement, calibration and theoreticval computation. A ring type load-cell and shaft torque transducer also could be used for the same purpose. 3. The torque and angular speed transducers for an auto-feed thresher and the displacement and pressure transducers for a rice whitener were made and gave satisfactory results. 4. Based on the above results, it is possible to develop simple and low-cost transducers to measure displacement, angular speed , torque and pressure of farm machine elements.