Development and evaluation of a two-axial shearing force sensor consisting of an optical sensor chip and elastic gum frame

Takeshita, Toshihiro; Harisaki, Kota; Ando, Hisami; Higurashi, Eiji; Nogami, Hirofumi; Sawada, Renshi

doi:10.1016/j.precisioneng.2016.02.004

Cited by 13 publications

(3 citation statements)

References 11 publications

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“…The measurement of contact stress on the human body has been reported using soft but thick sensors with a large measurement area inserted into the contact surface (Mimura et al, 2009), pressure-sensitive films (Gerhardt L-C et al, 2008), hard sensors (Laszczak et al, 2016;Young et al, 2014), or by embedding them in the contact object (Takeshita et al, 2016;Sakai et al, 2009;Noda et al, 2006). Although many contact pressure measurements have been performed on human contact surfaces using thin, flexible film sensors that can be attached to the skin, an accurate and direct measurement method for evaluating shear stress on the contact interface has not yet been established.…”

Section: Introductionmentioning

confidence: 99%

Film sensor for triaxial contact stress measurements on the human body

KUDO

Sasagawa

Fujisaki

2023

Mechanical Engineering Letters

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Many studies for contact stress measurements on the human body have been conducted using thin and flexible sensors that can be attached to the skin. However, accurate stress measurements, including shear stress evaluations on the contact interface, have not yet been established. This study aims to improve a previously developed thin, flexible sensor capable of measuring three-dimensional vector information, including contact pressure and biaxial shear stress. The previous sensor had an overlapping structure with the upper and lower electrodes. However, the adhesion between the electrode layers was insufficient, resulting in a lack of stability during low-stress measurements. Therefore, a double-sided tape was used to strengthen the adhesion. Furthermore, the electrode shape was revised so that the measurement area of the sensor was downsized and suitable for high integration. The revised sensor was calibrated and found appropriate relationships among contact pressure, shear stress, and output voltage, including the low-stress range. To demonstrate the efficacy of the improved sensor, the sensor was attached to the scapula of a human body. The contact stress acting on the scapula was measured when the backrest of the bed was operated on while the person was lying on the nursing bed. Thus, the change in low contact stress in response to the posture change of the human body on the bed could be measured. The usefulness of the improved sensor was verified experimentally.

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Section: Introductionmentioning

confidence: 99%

Film sensor for triaxial contact stress measurements on the human body

KUDO

Sasagawa

Fujisaki

2023

Mechanical Engineering Letters

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“…Many kinds of tactile sensing devices have been proposed by using various material components (Wan et al, 2017). Several types of tri-axis sensors have been developed using strain gages (Baki et al, 2013), optical devices (Takeshita et al, 2016), piezoelectric beams (Takahashi et al, 2013), and piezoelectric polymer films (Kärki et al, 2009). The high degree of flexibility has been achieved by Kasai, Sasagawa, Fujisaki, Saito and Koyama, Mechanical Engineering Letters, Vol.4 (2018) [DOI: 10.1299/mel.18-00257] using soft materials and liquid layers for construction of the sensor elements (Noda et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Development of contact pressure and shear stresses sensor for touch panel

Kasai

Sasagawa

Fujisaki

et al. 2018

Mechanical Engineering Letters

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Touch panels are widely used to detect contact conditions between fingers and screens, as human interface devices. The touch sensor used in smartphones has been significantly developed in recent years, and the sensor can recognize not only contact position, but also changes in contact pressure. However, previously proposed touch panels have not been able to measure shear stress. Measurements of the shear stress can facilitate the realization of more sensuous and functional operations through the touch panels. Thus, a sensor for the contact pressure and shear stress measurements was fabricated in this study, in which a conductive polymer was used as a pressure-sensitive material. Sensing units were constructed from transparent materials and integrated to be a 4 × 4 array structure. The calibration tests were performed under combined stresses with the contact pressure and the shear stress in multi-axis loading. The sensor system can detect the distributions of three-axis stress components on surfaces. The stress components were simultaneously measured under several types of finger slide motions. The possibility of quantitative measurements of the stresses acting on touch panels was confirmed by considering transparency of the sensor.

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“…(12)(13)(14) This sensor consists of a sensor chip on which 12 photodiodes (PDs) are integrated and a vertical-cavity surfaceemitting laser (VCSEL). This sensor is very small, easy to fabricate, and has high resolution.…”

Section: Introductionmentioning

confidence: 99%

Temperature Compensation for a Microoptical Displacement Sensor Using an Integrated Thermal Sensor

2016

Sensors and Materials

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We developed a microoptical displacement sensor on which a thermal sensor was integrated. The sensor was 3 × 3 mm 2 in size and 0.7 mm thick including the optical power source and thermal sensor. The optical displacement sensor can measure the linear displacement at high resolution without contacting the subject to be measured. We also investigated the dependence of the sensor on thermal change, and we tried to compensate for the dependence when using the thermal sensor by applying the correction functions A(T), B(T), and C(T). These correction functions, which can be easily calibrated, corresponded to the thermal correction of the irradiation angle of the optical power source, the output power of the optical power source, and the sensitivity of photodiodes (PDs), respectively. From the experimental results, the dependence of the optical displacement sensor was reduced from 2.27 to 0.13 µm/°C. This optical displacement sensor is expected to be used as a position sensor for piezoelectric actuators that also show strong thermal dependence.

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Development and evaluation of a two-axial shearing force sensor consisting of an optical sensor chip and elastic gum frame

Cited by 13 publications

References 11 publications

Film sensor for triaxial contact stress measurements on the human body

Film sensor for triaxial contact stress measurements on the human body

Development of contact pressure and shear stresses sensor for touch panel

Temperature Compensation for a Microoptical Displacement Sensor Using an Integrated Thermal Sensor

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