A Planar low-cost full-polymer Optical Humidity Sensor

Kelb, Christian; Körner, Martin; Prucker, Oswald; Rühe, Jürgen; Reithmeier, Eduard; Roth, Bernhard

doi:10.1016/j.protcy.2016.08.066

Cited by 12 publications

(10 citation statements)

References 17 publications

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“…Our chosen approach results in a polymer-only system for relative humidity measurement that we demonstrated originally in [2]. Here, we demonstrate the feasibility of the proposed device as a sensor for respiratory monitoring, included in a medical oxygen mask.…”

Section: Introductionmentioning

confidence: 83%

“…For increasing water content, the cladding would then scatter more light, coupled into it by the evanescent field, causing an intensity drop in transmitted light at the output of the sensing region. In [2], we could identify a variation in the scattering behavior upon water absorption.…”

Section: Methodsmentioning

confidence: 99%

“…The utilization of polymer-based optical systems for the measurement of different mechanical [1] or environmental [2,3] parameters has been and still is an intensively researched subject over the past ten years. Although the achievable precision is usually lower than with glass optical devices, polymer-only systems excel in cost-efficiency, mechanical flexibility, and variety of possible shapes.…”

Section: Introductionmentioning

confidence: 99%

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PDMAA Hydrogel Coated U-Bend Humidity Sensor Suited for Mass-Production

Kelb

Körner

Prucker

et al. 2017

Sensors

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We present a full-polymer respiratory monitoring device suited for application in environments with strong magnetic fields (e.g., during an MRI measurement). The sensor is based on the well-known evanescent field method and consists of a 1 mm plastic optical fiber with a bent region where the cladding is removed and the fiber is coated with poly-dimethylacrylamide (PDMAA). The combination of materials allows for a mass-production of the device by spray-coating and enables integration in disposable medical devices like oxygen masks, which we demonstrate here. We also present results of the application of an autocorrelation-based algorithm for respiratory frequency determination that is relevant for real applications of the device.

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Section: Introductionmentioning

confidence: 83%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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PDMAA Hydrogel Coated U-Bend Humidity Sensor Suited for Mass-Production

Kelb

Körner

Prucker

et al. 2017

Sensors

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“…In order to evaluate the sensor performance, the whole sensor was enclosed in an acrylic box, against environmental influences. To adjust the relative humidity, a Petri dish with a saturated salt solution was positioned inside the box together with the sensor [ 14 ]. By using lithium chloride (Carl Roth GmbH & Co. KG, Karlsruhe, Germany) at a temperature of

, it is possible to modify the relative humidity inside the box between 25% and 40%, For the determination of the actual relative humidity, a commercially available relative humidity sensor (TSP01 and M00426120, Thorlabs, Newton, MA, USA) was placed in the box, as well.…”

Section: Methodsmentioning

confidence: 99%

Polymer Based Whispering Gallery Mode Humidity Sensor

Petermann

Hildebrandt

Morgner

et al. 2018

Sensors

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Whispering gallery mode (WGM) resonators are versatile high sensitivity sensors, but applications regularly suffer from elaborate and expensive manufacturing and read-out. We have realized a simple and inexpensive concept for an all-polymer WGM sensor. Here, we evaluate its performance for relative humidity measurements demonstrating a sensitivity of 47 pm/% RH. Our results show the sensor concepts’ promising potential for use in real-life applications and environments.

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“…Figure 15. Sketch (left) and photographs (middle to right) of different aspects of the humidity sensor realized using reactive lamination and spray coating of polymer foils and polymer optical fibers [19].…”

Section: Simple Optical Strain Tilt and Humidity Sensor Devicesmentioning

confidence: 99%

Towards fabrication and application of polymer based photonics networks and sensors

Rahlves

Rezem

Günther

et al. 2018

MOEMS and Miniaturized Systems XVII

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Highly-functional photonic sensor networks integrated in thin polymer foils offer great potential for versatile applications in the life sciences, medicine, environmental analytics or production technology. For their realization, suitable low-cost and high-throughput production techniques need to be developed. Here, we describe work towards this goal, i.e. the fabrication of multimode polymer waveguides through a combination of thermal imprint and doctor blading. For imprint master stamp fabrication, a combined Bosch and O2 plasma etching process in silicon is utilized. We also demonstrate stamp fabrication by an additive manufacturing method, i.e. by employing maskless UV lithography, to enhance the flexibility and cost-effectiveness of our approach. We, thus, realize various all-polymer waveguide arrays, beam splitters, and grating couplers which serve as basic elements to create more complex photonic circuits. We also demonstrate polymer based transmission lines comprising semiconductor as well as organic light sources and detectors. We discuss both the integration of semiconductor light sources and detectors such as verticalcavity surface-emitting lasers (VCSEL) and photo detectors as well as organic light emitting diodes (OLEDs) and organic photo detectors. In first applications, we combine these elements to create sensor arrays for measuring temperature, strain or refractive index. We show results of various sensor types utilizing different measurement principles implemented in laboratory environments so far. For example, a waveguide array containing a linear discontinuity which serves as elongation zone for displacement, strain or tilt measurement by detecting the intensity variation of the transmitted light propagating inside the structure is presented. In future, we plan to create more powerful sensor photonics networks for reliable and robust applications in real life, e.g. for point-of-care testing or production monitoring.

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A Planar low-cost full-polymer Optical Humidity Sensor

Cited by 12 publications

References 17 publications

PDMAA Hydrogel Coated U-Bend Humidity Sensor Suited for Mass-Production

PDMAA Hydrogel Coated U-Bend Humidity Sensor Suited for Mass-Production

Polymer Based Whispering Gallery Mode Humidity Sensor

Towards fabrication and application of polymer based photonics networks and sensors

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