Color Sensors and Their Applications

Puiu, Poenar Daniel

doi:10.1007/978-3-642-25498-7_1

Cited by 8 publications

(5 citation statements)

References 138 publications

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“…An RGB color sensor basically comprises three main components including the underlying semiconductor structure of the photodiodes, the array of optical filters defining its spectral sensitivity, and the electronic circuit used for signal readout [110]. Its physical principle is illustrated in Figure 1.…”

Section: Physical Structure and Working Principle Of Rgb Color Sensorsmentioning

confidence: 99%

Processing RGB Color Sensors for Measuring the Circadian Stimulus of Artificial and Daylight Light Sources

et al. 2022

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The three main tasks of modern lighting design are to support the visual performance, satisfy color emotion (color quality), and promote positive non-visual outcomes. In view of large-scale applications, the use of simple and inexpensive RGB color sensors to monitor related visual and non-visual illumination parameters seems to be of great promise for the future development of human-centered lighting control systems. In this context, the present work proposes a new methodology to assess the circadian effectiveness of the prevalent lighting conditions for daylight and artificial light sources in terms of the physiologically relevant circadian stimulus (CS) metric using such color sensors. In the case of daylight, the raw sensor readouts were processed in such a way that the CIE daylight model can be applied as an intermediate step to estimate its spectral composition, from which CS can eventually be calculated straightforwardly. Maximal CS prediction errors of less than 0.0025 were observed when tested on real data. For artificial light sources, on the other hand, the CS approximation method of Truong et al. was applied to estimate its circadian effectiveness from the sensor readouts. In this case, a maximal CS prediction error of 0.028 must be reported, which is considerably larger compared to daylight, but still in an acceptable range for typical indoor lighting applications. The use of RGB color sensors is thus shown to be suitable for estimating the circadian effectiveness of both types of illumination with sufficient accuracy for practical applications.

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Section: Physical Structure and Working Principle Of Rgb Color Sensorsmentioning

confidence: 99%

Processing RGB Color Sensors for Measuring the Circadian Stimulus of Artificial and Daylight Light Sources

et al. 2022

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“…Colorimetry has many practical advantages as a sensing technique. Its mechanism of using a chemical reaction to yield a color change gives it the capability to be highly selective, a desirable property for taking measurements in real-world environments . Another key advantage of colorimetry is its optical readout that promises parallel detection of multiple analytes.…”

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confidence: 99%

“…Its mechanism of using a chemical reaction to yield a color change gives it the capability to be highly selective, a desirable property for taking measurements in real-world environments. 12 Another key advantage of colorimetry is its optical readout that promises parallel detection of multiple analytes. Despite the promise, traditional colorimetric gas sensors face two major challenges: One is sensor-to-sensor variation that leads to tedious and costly individual calibrations, limiting their usefulness outside of the laboratory.…”

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confidence: 99%

A Microdroplet-Based Colorimetric Sensing Platform on a CMOS Imager Chip

et al. 2020

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Interest in mobile chemical sensors is on the rise, but significant challenges have restricted widespread adoption into commercial devices. To be useful these sensors need to have a predictable response, easy calibration, and be integrable with existing technology, preferably fitting on a single chip. With respect to integration, the CMOS imager makes an attractive template for an optoelectronic sensing platform. Demand for smartphones with cameras has driven down the price and size of CMOS imagers over the past decade. The low cost and accessibility of these powerful tools motivated us to print chemical sensing elements directly on the surface of the photodiode array. These printed colorimetric microdroplets are composed of a nonvolatile solvent so they remain in a uniform and homogeneous solution phase, an ideal medium for chemical interactions and optical measurements. By imaging microdroplets on the CMOS imager surface we eliminated the need for lenses, dramatically scaling down the size of the sensing platform to a single chip. We believe the technique is generalizable to many colorimetric formulations, and as an example we detected gaseous ammonia with Cu(II). Limits of detection as low as 27 ppb and sensor-to-sensor variation of less than 10% across multiple printed arrays demonstrated the high sensitivity and repeatability of this approach. Sensors generated this way could share a single calibration, greatly reducing the complexity of incorporating chemical sensors into mobile devices. Additional testing showed the sensor can be reused and has good selectivity; sensitivity and dynamic range can be tuned by controlling droplet size.

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“…Colorimetry detects an analyte via a color change resulting from a specific reaction of the analyte with a sensing material. This sensing platform is among the oldest sensing principles, and still widely used today for gas detection because of its simplicity, low cost, and selectivity . However, most colorimetric gas sensors are for one-time use only.…”

mentioning

confidence: 99%

“…This sensing platform is among the oldest sensing principles, and still widely used today for gas detection because of its simplicity, low cost, and selectivity. 1 However, most colorimetric gas sensors are for one-time use only. This is because the specific reactions are typically irreversible and the sensing materials are unstable when exposed to ambient air.…”

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confidence: 99%

Light-Controlled Configurable Colorimetric Sensing Array

Qin

Wang

et al. 2019

Anal. Chem.

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Colorimetry is a popular gas-sensing platform, but it is typically limited to one-time use only. Here, we introduce a light-controlled configurable colorimetric sensing array to overcome this limitation. It features a photoactivated reaction between an analyte and a sensing material, such that sensing of an array element can be turned on and off with light. By sequential turning on of each array element, the sensor array can be used multiple times as determined by the number of array elements. This is analogous to a data storage device, which lasts until every storage element is used up. The total number of array elements and the area of each array element are configurable with light. With use of a smartphone screen as a programmable light source, we applied the sensing platform to the detection of oxygen gas and studied the relationship between sensitivity, noise, detection time, and array size. The relationship can be used to configure the array to meet the specifications of different applications.

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Color Sensors and Their Applications

Cited by 8 publications

References 138 publications

Processing RGB Color Sensors for Measuring the Circadian Stimulus of Artificial and Daylight Light Sources

Processing RGB Color Sensors for Measuring the Circadian Stimulus of Artificial and Daylight Light Sources

A Microdroplet-Based Colorimetric Sensing Platform on a CMOS Imager Chip

Light-Controlled Configurable Colorimetric Sensing Array

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