Computational Experiments on the Step and Frequency Responses of a Three-Axis Thermal Accelerometer

Ogami, Yoshifumi; Murakita, Naoya; Fukudome, Koji

doi:10.3390/s17112618

Cited by 5 publications

(4 citation statements)

References 7 publications

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“…While using the concept of cross-axis sensitivity for a 3-axis thermal accelerometer, it has been mentioned by Nguyen [12] and Ogami [1] that "the same response can be observed for two accelerations with different magnitudes and opposite signs", which means that two combinations of temperature outputs can determine a single acceleration. In our study, we observed acceleration in the x-direction and rotation around the z-direction, but even by considering X-and Y-sensor responses, because of cross-axis sensitivity, results were observed to have a unique combination of temperature outputs corresponding to accelerations of 1g-4g and rotational speeds of 6.28-15.71 rad/s.…”

Section: Discussionmentioning

confidence: 99%

“…This is accomplished by considering the cross-axis sensitivity, which is the sensitivity observed in the plane perpendicular to the measuring direction relative to the measuring direction. Ogami [1] suggested that cross-axis sensitivity should not be removed but rather exploited. In this way, if multiple motion types are applied on a single axis, with sensitivities observed in other axes, the input physical quantities will have a relationship with the output sensitivities.…”

Section: Introductionmentioning

confidence: 99%

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Computational Study on Thermal Motion Sensors That Can Measure Acceleration and Rotation Simultaneously

Siddique

Ogami

2022

Sensors

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In this study, a new technique has been proposed by numerical simulations by which multiple physical quantities can be simultaneously measured. The sensor is a modification of existing physical sensors such as a thermal motion sensor. Simultaneous measurement of acceleration and rotation is presented herein. Cross-axis sensitivity is employed such that output sensitivities observed at two perpendicular axes, X and Y sensor data, are related to the input physical quantities. The physics involved in measurement is similar to that of a conventional thermal accelerometer, hence the governing equations predicting the sensor response are based on the conservation of mass, momentum, and energy, and are discretized by using a commercially available software FLUENT. A series of computational studies are conducted and using these studies a novel idea is proposed in which the maximum temperature values are obtained at various positions around a heating source and are correlated with the applied acceleration and rotational speed. A parametric study is also presented to find the optimum distance between the heater and sensors. The influence of changing gas medium on the temperature curves has also been examined and it has been concluded that CO2 generates the maximum performance due to its higher density and lower viscosity.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Computational Study on Thermal Motion Sensors That Can Measure Acceleration and Rotation Simultaneously

Siddique

Ogami

2022

Sensors

Self Cite

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“…In contrast, three sets of temperature sensors are required to detect temperatures around the X-, Y-, and Z-axes for a triple-axis thermal accelerometer. To reduce installation and maintenance costs, Ogami's concept [17], which uses cross-axis sensitivity (CAS), can be used. Due to CAS, when motion is applied to a single axis, a correlating temperature change is observed on the other two perpendicular axes.…”

Section: Introductionmentioning

confidence: 99%

Computational Study of a Motion Sensor to Simultaneously Measure Two Physical Quantities in All Three Directions for a UAV

Siddique

Ogami

2023

Sensors

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Cross-axis sensitivity is generally undesirable, and lower values are required for the accurate performance of a thermal accelerometer. In this study, errors in devices are utilized to simultaneously measure two physical quantities of an unmanned aerial vehicle (UAV) in the X-, Y-, and Z-directions, i.e., where three accelerations and three rotations can also be simultaneously measured using a single motion sensor. The 3D structures of thermal accelerometers were designed and simulated in a FEM simulator using commercially available FLUENT 18.2 software Obtained temperature responses were correlated with input physical quantities, and a graphical relationship was created between peak temperature values and input accelerations and rotations. Using this graphical representation, any values of acceleration from 1g to 4g and rotational speed from 200 to 1000°/s can be simultaneously measured in all three directions.

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“…[46,47], the design of three-axis thermal accelerometer using segmented circular heater was mentioned. Using numerical simulation, Ogami et al reported that the sensor could reliably determine a vast range of vertical acceleration, specifically, ±10,000 g [47]. However, the experimental details were omitted.…”

Section: Introductionmentioning

confidence: 99%

Tri-axis convective accelerometer with closed-loop heat source

Dau

Dinh

Tran

et al. 2018

Sensors and Actuators A: Physical

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In this paper, we report the details and findings of a study on tri-axis convective accelerometer, which is designed with the closed-loop type heat source and thermal sensing hotwire elements. The closed-loop heat source enhances the convective flow to the central part where a hotwire is placed to measure the vertical component of acceleration. The simulation was conducted using numerical analysis, and the device was prototyped by additive manufacturing. The device, functioning as a tilt sensor and an accelerometer, was tested up to acceleration of 20g.The experiments were successfully conducted and the experimental results agreed reasonably with those obtained by numerical analysis. The results demonstrated that the closed-loop heat source could reduce the cross effect between the acceleration components. The scale factor and cross-sensitivity had the values of 0.26 μV/g and 1.2%, respectively. The cross-sensitivity and the effects of heating power were also investigated in this study.

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Computational Experiments on the Step and Frequency Responses of a Three-Axis Thermal Accelerometer

Cited by 5 publications

References 7 publications

Computational Study on Thermal Motion Sensors That Can Measure Acceleration and Rotation Simultaneously

Computational Study on Thermal Motion Sensors That Can Measure Acceleration and Rotation Simultaneously

Computational Study of a Motion Sensor to Simultaneously Measure Two Physical Quantities in All Three Directions for a UAV

Tri-axis convective accelerometer with closed-loop heat source

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