Development of a refractive index measurement system for vacuum pressure measurement

Song, Han Wook; Kim, Jong Ho; Woo, Sam-Yong

doi:10.1007/s40042-020-00012-y

Cited by 10 publications

(3 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The garment pressures were measured 2–3 times for each movement, and participants had 10-min rests between each posture 30 . Each part was measured for a total of 60 s. Based on previous research 31 , 10 s were eliminated from the beginning and from the end of the collected data for noise removal, such that the average value for a duration of 40 s was analyzed.…”

Section: Methodsmentioning

confidence: 99%

“…A face-to-face interview survey was conducted with the 12 participants 26 . A total of 43 questions were asked, including 9 demographic questions (gender, age, height, weight, residence area, occupation, health status, garment-wearing habits) and 28 questions about subjective garment pressure (shoulder, waist, front thigh, back thigh, front lower thigh, front calf, back calf, 2-kg weight) 30 , 31 . The 16 questions on design satisfaction consisted of questions on durability, functionality, design, materials, and purchase and use intentions 26 , 33 – 35 and were based on a 5-point Likert scale, but also included an open-ended question for suggestions.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Development of a comfort suit-type soft-wearable robot with flexible artificial muscles for walking assistance

Piao

Kim

et al. 2023

Sci Rep

View full text Add to dashboard Cite

Anchoring components are added to wearable robots to ensure a stable interaction between the suits and the human body and to minimize the displacement of the suits. However, these components can apply pressure to the body and can cause user dissatisfaction, which can decrease willingness to use the suits. Therefore, this study aims to develop a suit-type soft-wearable robot platform for walking assistance by providing comfortable garment pressure to ensure user satisfaction. The first prototype of a wearable robot suit was developed with anchoring components on the shoulders, waist, and thighs based on previous research results. Wear tests were conducted to measure garment pressure depending on posture using pressure sensors, and satisfaction surveys were conducted. The second prototype design was then developed, and performance tests with flexible artificial muscles and a satisfaction survey were conducted. Regarding the first prototype, the participants felt more than normal pressure in the shoulders and relatively less pressure in the thighs and calves. Thus, compared to the first design, the second design ensured a decreased garment pressure and resulted in an improvement of overall user satisfaction. These results can help provide guidance in the development of wearable robots by taking pressure comfort and user satisfaction into consideration.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Development of a comfort suit-type soft-wearable robot with flexible artificial muscles for walking assistance

Piao

Kim

et al. 2023

Sci Rep

View full text Add to dashboard Cite

show abstract

“…A cell-based refractometer has been used to determine the density of helium by measuring the optical refractivity and hence pressure using the equation of state [6]. Another widely researched method is based on optically measuring the gas number density using an optical Interferometer manometer and is in various stages of implementation in NMI's like NIST (USA), NIM (China), PTB (Germany), NMIJ (Japan), KRISS (South Korea) [7][8][9][10]. It is based on optical Fabry-Perot (FP) cavities, which effectively measure the refractivity of the gas particles based on the measurement of resonant frequencies.…”

Section: Introductionmentioning

confidence: 99%

Laser based optical interferometer manometer design for primary pressure standard in India

Das¹,

Ghosh²,

Kumar³

et al. 2023

Preprint

View full text Add to dashboard Cite

The SI unit of pressure, i.e. Pascal is realized with mechanical devices such as ultrasonic interferometer manometers and pressure balances for the pressure range 1 Pa to 100 kPa. Recently, optical interferometer manometers are being used to realize Pascal. Such a realization is mercury-free and environmentally friendly and does not depend on any mechanical motions as in piston gauges and is based on physical constants. It consists of an optical Fabry-Perot cavity as a refractometer and is based on the measurement of the resonant frequency of the cavity using lasers. In this paper, we report the theoretical calculations for such an optical cavity and discuss various parameters for the laser required for developing such a cavity-based refractometer system. We present the mechanical design for the dual cavity and the effect of pressure on the elastic deformation of such cavities using finite element analysis. We present an all-fiber optical set-up for the lasers, to be used for the next generation of primary pressure standards in the barometric region of pressure at CSIR-National physical laboratory, India.

show abstract

Quantum Pascal Realization from Refractometry

Thakur

Yadav

Kumar

2023

Handbook of Metrology and Applications

View full text Add to dashboard Cite

Development of a refractive index measurement system for vacuum pressure measurement

Cited by 10 publications

References 9 publications

Development of a comfort suit-type soft-wearable robot with flexible artificial muscles for walking assistance

Development of a comfort suit-type soft-wearable robot with flexible artificial muscles for walking assistance

Laser based optical interferometer manometer design for primary pressure standard in India

Quantum Pascal Realization from Refractometry

Contact Info

Product

Resources

About