11. Measurement devices

We have studied and analyzed status and metrological supervision of blood glucose monitors, individual devices for a person’s blood glucose level measurement. It has been indicated that nowadays blood glucose monitors like other individual devices for medical measurement are not allowed to be involved in telemedicine public service. This accounts for absence of metrological supervision with these measurement devices in telemedicine. In addition, the key problem is absence of safe methods and means of remote verificaition, calibration and transmission of measurement data to health care centers. The article offers a remote test method for blood glucose monitors using a number of resistors with values correlating with measured blood glucose level. The available method has been successfully trialed in real practice.

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One-shot Multi-angle Measurement Device for Evaluating the Sparkle Impression

Electronic Imaging ◽

10.2352/issn.2470-1173.2020.5.maap-120 ◽

2020 ◽

Vol 2020 (5) ◽

pp. 60401-1-60401-8

Author(s):

Shuhei Watanabe

Keyword(s):

Spatial Frequency ◽

Product Design ◽

Angle Measurement ◽

Observation Angle ◽

Light Sources ◽

Quantification Method ◽

Material Appearance ◽

Subjective Score ◽

Measurement Devices ◽

Rotation Stage

The quantification of material appearance is important in product design. In particular, the sparkle impression of metallic paint used mainly for automobiles varies with the observation angle. Although several evaluation methods and multi-angle measurement devices have been proposed for the impression, it is necessary to add more light sources or cameras to the devices to increase the number of evaluation angles. The present study constructed a device that evaluates the multi-angle sparkle impression in one shot and developed a method for quantifying the impression. The device comprises a line spectral camera, light source, and motorized rotation stage. The quantification method is based on spatial frequency characteristics. It was confirmed that the evaluation value obtained from the image recorded by the constructed device correlates closely with a subjective score. Furthermore, the evaluation value is significantly correlated with that obtained using a commercially available evaluation device.

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Review for "Measurement devices allocation in distribution system using state estimation: A multi‐objective approach"

10.1002/2050-7038.12469/v2/review3 ◽

2020 ◽

Keyword(s):

State Estimation ◽

Distribution System ◽

Multi Objective ◽

Measurement Devices

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Review for "Measurement devices allocation in distribution system using state estimation: A multi‐objective approach"

10.1002/2050-7038.12469/v2/review2 ◽

2020 ◽

Keyword(s):

State Estimation ◽

Distribution System ◽

Multi Objective ◽

Measurement Devices

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LumNet

Proceedings of the ACM on Interactive Mobile Wearable and Ubiquitous Technologies ◽

10.1145/3463500 ◽

2021 ◽

Vol 5 (2) ◽

pp. 1-20

Author(s):

Prince U.C. Songwa ◽

Aaqib Saeed ◽

Sachin Bhardwaj ◽

Thijs W. Kruisselbrink ◽

Tanir Ozcelebi

Keyword(s):

Control Systems ◽

Real Life ◽

Visual Performance ◽

Lighting Control ◽

Domain Specific ◽

Real Life Setting ◽

Added Benefit ◽

Measurement Devices ◽

Indoor Spaces ◽

Learned Features

High-quality lighting positively influences visual performance in humans. The experienced visual performance can be measured using desktop luminance and hence several lighting control systems have been developed for its quantification. However, the measurement devices that are used to monitor the desktop luminance in existing lighting control systems are obtrusive to the users. As an alternative, ceiling-based luminance projection sensors are being used recently as these are unobtrusive and can capture the direct task area of a user. The positioning of these devices on the ceiling requires to estimate the desktop luminance in the user's vertical visual field, solely using ceiling-based measurements, to better predict the experienced visual performance of the user. For this purpose, we present LUMNET, an approach for estimating desktop luminance with deep models through utilizing supervised and self-supervised learning. Our model learns visual representations from ceiling-based images, which are collected in indoor spaces within the physical vicinity of the user to predict average desktop luminance as experienced in a real-life setting. We also propose a self-supervised contrastive method for pre-training LUMNET with unlabeled data and we demonstrate that the learned features are transferable onto a small labeled dataset which minimizes the requirement of costly data annotations. Likewise, we perform experiments on domain-specific datasets and show that our approach significantly improves over the baseline results from prior methods in estimating luminance, particularly in the low-data regime. LUMNET is an important step towards learning-based technique for luminance estimation and can be used for adaptive lighting control directly on-device thanks to its minimal computational footprint with an added benefit of preserving user's privacy.

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Lifetime of electrochromic optical transition cycling of ethyl viologen diperchlorate-based electrochromic devices

SN Applied Sciences ◽

10.1007/s42452-021-04552-1 ◽

2021 ◽

Vol 3 (5) ◽

Author(s):

Logan G. Kiefer ◽

Christian J. Robert ◽

Taylor D. Sparks

Keyword(s):

Optical Transition ◽

Low Cost ◽

Cycling Performance ◽

Power Measurement ◽

Electrochromic Devices ◽

Metal Oxide Films ◽

Cycle Times ◽

Vis Spectroscopy ◽

Multiple Devices ◽

Measurement Devices

AbstractElectrochromic materials and devices are enabling a variety of advanced technologies. Gel-based organic electrochromic molecules such as ethyl viologen diperchlorate are attractive options due to their simple device design and low cost processing options relative to the more expensive and complex transition metal oxide films. However, electrochromic devices are subject to extensive cycling in which failure and fatigue can eventually occur. This work presents the lifetime cycling performance of ethyl viologen diperchlorate-based electrochromic devices using two different anodic compounds, hydroquinone and ferrocene, which are cycled at different voltages, 3 V and 1.2 V, respectively. Multiple devices are cycled until failure with periodic device characterization via UV–Vis spectroscopy, electrical resistance and power measurement, and transition duration measurement. Devices with hydroquinone can transition quickly. Cycle times are $$\sim$$ ∼ 30 s in these samples, however, these samples also typically fail before 3000 cycles. On the other hand, devices using ferrocene transition more slowly (total cycle time $$\sim$$ ∼ 2 min), but have superior cycling performance with all samples surviving beyond 10,000 cycles while complying with ASTM E2141-14 standard.

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324 Naturalistic Characterization of Sleep in Chronic Insomnia Using a Non-Contact Sleep Measurement Device

SLEEP ◽

10.1093/sleep/zsab072.323 ◽

2021 ◽

Vol 44 (Supplement_2) ◽

pp. A130-A130

Author(s):

Devon Hansen ◽

Mary Peterson ◽

Roy Raymann ◽

Hans Van Dongen ◽

Nathaniel Watson

Keyword(s):

Sleep Onset ◽

Contact Device ◽

Chronic Insomnia ◽

Poor Sleep ◽

Measurement Device ◽

Home Setting ◽

Time In Bed ◽

Sleep Measurement ◽

Measurement Devices

Abstract Introduction Individuals with insomnia report poor sleep quality and non-restorative sleep, and often exhibit irregular sleep patterns over days and weeks. First night effects and logistical challenges make it difficult to measure these sleep characteristics in the laboratory. Also, sensitivity to sleep disruption from obtrusive measurement devices confounds sleep measurements in people with insomnia in their naturalistic setting. Non-contact sleep measurement devices have the potential to address these issues and enable ecologically valid, longitudinal characterization of sleep in individuals with insomnia. Here we use a non-contact device – the SleepScore Max (SleepScore Labs) – to assess the sleep of individuals with chronic insomnia, compared to healthy sleeper controls, in their home setting. Methods As part of a larger study, 13 individuals with chronic insomnia (ages 25-60y, 7 males) and 8 healthy sleeper controls (ages 21-46y, 6 females) participated in an at-home sleep monitoring study. Enrollment criteria included an age range of 18-65y and, for the insomnia group, ICSD-3 criteria for chronic insomnia with no other clinically relevant illness. Participants used the non-contact sleep measurement device to record their sleep periods each night for 8 weeks. Sleep measurements were analyzed for group differences in both means (characterizing sleep overall) and within-subject standard deviations (characterizing sleep variability across nights), using mixed-effects regression controlling for systematic between-subject differences. Results Based on the non-contact sleep measurements, individuals with chronic insomnia exhibited greater variability in bedtime, time in bed, total sleep time, sleep latency, total wake time across time in bed, wakefulness after sleep onset, sleep interruptions, and estimated light sleep, compared to healthy sleeper controls (all F>5.7, P<0.05). No significant differences were found for group averages and for variability in estimated deep and REM sleep. Conclusion In this group of individuals with chronic insomnia, a non-contact device used to characterize sleep naturalistically captured enhanced variability across nights in multiple aspects of sleep stereotypical of sleep disturbances in chronic insomnia, differentiating the sample statistically significantly from healthy sleeper controls. Support (if any) NIH grant KL2TR002317; research devices provided by SleepScore Labs.

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