Neuartiger, auf Dehnungsmessstreifen basierender Dehnungsaufnehmer für die Bauwerksüberwachung (A New Type of Strain-Gauge-based Strain-Sensor for the Monitoring of Buildings)

2007 ◽  
Vol 74 (2) ◽  
Author(s):  
Falk Tegtmeier
Keyword(s):  
Strain Gauge ◽  
Strain Sensor ◽  
New Type

scholarly journals Investigation on Seismic Damage Model Test of a High Concrete Gravity Dam Based on Application of FBG Strain Sensor

Complexity ◽  
2019 ◽  
Vol 2019 ◽  
pp. 1-12 ◽  
Author(s):  
Mingming Wang ◽  
Jianyun Chen ◽  
Hai Wei ◽  
Bingyue Song ◽  
Weirong Xiao
Keyword(s):  
Strain Gauge ◽  
Safety Evaluation ◽  
Strain Sensor ◽  
High Sensitivity ◽  
Model Material ◽  
Gravity Dam ◽  
Scale Model ◽  
Dynamic Strain ◽  
Small Scale ◽  
Small Scale Model

A 203-m-high gravity dam being built in earthquake-prone areas needs to be investigated very carefully to determine its dynamic responses, damage mechanism, and safety evaluation. The dynamic characteristics, seismic responses, failure mode, and safety evaluation of the above structure are presented through dynamic fracture test for small-scale model on shaking table. Because the strength of the model material is very low, the traditional strain gauge is also not easy to be glued to the surface of model. It is difficult to measure the accurate strain data of small-scale model during testing. Therefore, Fiber Bragg Grating (FBG) strain sensor is presented to obtain the strain of small-scale model during testing, due to its high sensitivity. The dynamic strain and residual strain are obtained with the FBG sensors embedded in model. The FBG sensor is adhered to model material completely and shows advantages of ease for installation, high sensitivity, and reliability compared with traditional resistance strain gauge. The model during testing is submitted with earthquake wave from the Chinese Code. In the experiment, the peak ground acceleration (PGA) of the first crack in the model indicates the safety level of the gravity dam. The crack locations and forms determine the damageable part of gravity dam under intense earthquake. After the final analysis, the safety evaluation result of the gravity dam under strong earthquake is given in order to guide the implementation of the project.

Research on FBG High Temperature Sensor Used for Strain Monitoring

2013 ◽  
Vol 341-342 ◽  
pp. 851-855
Author(s):  
Yue Ming Liu ◽  
Qing Mu Cai ◽  
Jun Lou
Keyword(s):  
High Temperature ◽  
Strain Gauge ◽  
Power Plants ◽  
Strain Sensor ◽  
Strain Sensing ◽  
High Temperature Alloy ◽  
Oil Companies ◽  
Reliable Performance ◽  
Gauge Structure ◽  
Temperature Strain

Strain sensing is widely used in safety monitoring of high temperature pressure pipes in oil companies and power plants. A novel high-temperature strain sensor was researched based on FBG(Fiber Bragg Grating) and the elastic high-temperature alloy in this paper. First, high-temperature Polyimide fiber FBG was prepared and tested in high temperature chamber. Second, a novel T strain gauge structure of three FBG was designed and fabricated on the elastic high-temperature alloy. This strain gauge could be applied in measurement of two-dimensional high-temperature strain sensing. In the end, a equi-intensity cantilever was adopted to test the high-temperature FBG strain sensor and testing results verified that the T type FBG strain sensor was suitable for high-temperature strain sensing with reliable performance in 300°C environment.

A Wireless Strain Sensor Using Frequency Modulation Technique

2009 ◽  
Author(s):  
Hwan-Sik Yoon ◽  
Sanket K. Khedkar
Keyword(s):  
Frequency Modulation ◽  
Strain Gauge ◽  
Strain Measurement ◽  
Measurement Data ◽  
Strain Sensor ◽  
Vibration Measurement ◽  
Dynamic Strain ◽  
Turbine Engine ◽  
Cantilevered Beam ◽  
Remote Station

A compact wireless strain sensor using a Frequency Modulation (FM) technique is proposed. The sensor employs a conventional resistive strain gauge such that the resistance changes as the measured structure is mechanically strained. When the strain gauge is connected to a frequency modulation circuit, the change in the resistance appears as a frequency shift in the output signal that is transmitted wirelessly to a remote station. The received signal is then demodulated and the buried strain measurement data can be retrieved. Using this technique, a dynamic strain measurement is possible without any wire connection between the sensing point and the measurement equipment. This type of sensors have numerous applications in the strain or vibration measurement of moving or rotating structures such as fans on a turbine engine. The proposed concept of the wireless strain sensor is experimentally demonstrated by measuring vibration of a cantilevered beam with a wired transmission of the measurement data from the transmitter to the receiver.

Innovative Construction of 3-Component Aerodynamic Balance

2013 ◽  
Vol 542 ◽  
pp. 171-177 ◽  
Author(s):  
Jan Ryś ◽  
Marcin Augustyn
Keyword(s):  
Wind Tunnel ◽  
Strain Gauge ◽  
Aerodynamic Load ◽  
Measuring Accuracy ◽  
Load Factors ◽  
New Type

This paper deals with a description of a new type an aerodynamic balance used in a wind tunnel for measuring forces acting on a model. A concept of the strain gauge balance in which the three component of aerodynamically force can be measured was presented. The tests proved good measuring accuracy of this construction. On the basis of such a solution three component of force and aerodynamic load factors can be easily evaluated.

scholarly journals Pengembangan Prototipe Sensor Elektromekanik Berbasis Prinsip Strain Gauge Menggunakan Poly(3,4-ethylenedioxythiophene):Poly(styrene sulfonic acid) (PEDOT:PSS) (Halaman 14 s.d. 17)

2014 ◽  
Vol 17 (49) ◽  
Author(s):  
Detiza Goldianto Octensi Hernowo ◽  
Kuwat Triyana
Keyword(s):  
Strain Gauge ◽  
Sulfonic Acid ◽  
Strain Sensor ◽  
Nitrile Rubber ◽  
Styrene Sulfonic Acid

Tujuan dari penelitian ini adalah untuk mengembangkan prototype sensor elektromekanik menggunakan polimer konduktif poly (3,4-ethylenedioxythiophene): poly (styrenesulfonate) (PEDOT: PSS). Sebelum melakukan fabrikasi dan karakterisasi sensor, pertama – tama dilakukan verifikasi homogenitas resistansi pada lapisan PEDOT:PSS yang dideposisikan pada substrat isolator. Pada kasus ini, uji homogenitas dilakukan pada 5 posisi berbeda di atas lapisan PEDOT:PSS. Fabrikasi sensor dilakukan pada PEDOT:PSS menggunakan metode drop-coating di atas substrat nitrile rubber. Hasil yang diperoleh pada resistivitas listrik relatif ternormalisasi dari sensor elektromekanik menunjukkan sifat linear terhadap strain sensor. Selain itu, resistivitas sensor dipengaruhi oleh perubahan suhu secara eksponensial pada rentang 30 - 80  °C.

Determination of Damage to the Piezoelectric Sensor by Measuring the Electrical Capacitance

2015 ◽  
Vol 240 ◽  
pp. 31-35
Author(s):  
Witold Rządkowski ◽  
Paweł Pyrzanowski
Keyword(s):  
Cyclic Loading ◽  
Physical Properties ◽  
Strain Gauge ◽  
Piezoelectric Transducer ◽  
Strain Sensor ◽  
Piezoelectric Sensor ◽  
Load Level ◽  
Piezoelectric Transducers ◽  
Electrical Capacitance

This work presents testing mechanical defects of MFC piezoelectric transducers. The issue is important when piezoelectric transducer is used as eg. strain sensor. Repeatability of measurements is a goal, which can be obtained only if transducer has the same physical properties in every measurement. One way to determine damaged part of the sensor is measuring capacitance of MFC transducer. A couple of tests were performed to determine capacitance under non-destroying cyclic loading, and with loads causing PZT failure. Relation of capacity and load level was also investigated. All tests were validated with results from traditional resistive strain gauge

Metal-Containing Diamond-Like Carbon Coating as a Smart Sensor

2010 ◽  
Vol 638-642 ◽  
pp. 2103-2108 ◽  
Author(s):  
Toshiyuki Takagi ◽  
Takanori Takeno ◽  
Hiroyuki Miki
Keyword(s):  
Metal Clusters ◽  
Protective Coatings ◽  
Strain Sensor ◽  
Diamond Like Carbon ◽  
Deposition Condition ◽  
Smart Sensor ◽  
Dlc Coatings ◽  
Dlc Coating ◽  
New Type ◽  
Smart Coating

A new type of smart sensor based on metal-containing diamond-like carbon (DLC) coatings is presented. DLC coatings are widely used as protective coatings to improve the surface properties of objective materials; for example, to increase hardness and chemical stability. With the addition of metal clusters into DLC coatings, electrical conduction appears to depend on the microstructure. Such coatings can be used in fabricating resistive sensors. In this paper, we present tungsten-containing DLC (W-DLC) as a possible strain sensor. The strain sensitivity is greatly affected by the deposition condition. We also fabricate a double-layered DLC/W-DLC coating. The double-layered structure is expected to be used as a smart coating having functionality as a sensor with a protective DLC overcoat.

Deformed anhydrite nodules: A new type of finite strain gauge in sedimentary rocks

1986 ◽  
Vol 124 (3-4) ◽  
pp. 309-323 ◽  
Author(s):  
J.T. Van Berkel ◽  
J.G. Torrance ◽  
W.M. Schwerdtner
Keyword(s):  
Strain Gauge ◽  
Finite Strain ◽  
Sedimentary Rocks ◽  
New Type

scholarly journals A Biaxial Strain Sensor Using a Single MoS2 Grating

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
Junxiang Xiang ◽  
Wenhui Wang ◽  
Lantian Feng ◽  
Chao Feng ◽  
Meng Huang ◽  
...  
Keyword(s):  
Experimental Studies ◽  
Strain Sensor ◽  
Grating Period ◽  
Strain Component ◽  
Biaxial Strain ◽  
New Approach ◽  
Additional Strain ◽  
New Type ◽  
Diffraction Patterns ◽  
Single Crystal Layer

AbstractIn this paper, we report a new type of MoS2-based grating sensor for in-plane biaxial strain gauges with a precision limit of ~ 1‰. The MoS2 grating is numerically simulated with different biaxial strains up to 5%. Our first-principles calculations reveal that the strain sensitivity of the MoS2 reflectance spectrum can be considered an additional strain sensor integrated with the grating structure, enabling the mapping of in-plane biaxial strains. Our experimental studies on a prototype MoS2-grating sensor further confirm that a strain component perpendicular to the grating period can cause intensity peak shifts in the grating’s first-order diffraction patterns. This work opens a new path towards the sensing of in-plane biaxial strain within a single-grating device. Our new approach is applicable for other materials that have predictable reflectance response under biaxial strains and the capacity to form a two-dimensional single-crystal layer.

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