An IoT optical sensor for photometric determination of oxalate in infusions

Solid state dual electrode electroanalysis under hydrodynamic conditions: Application to pH-controlled in-line sensing.

“…This rapid growth of the IoT market is driving the need for additional, more functional and reliable sensors that can operate and communicate on IoT networks. Sensor devices typically employ a variety of transducer methods such as optical, [2][3][4] electrical, [5][6][7] and/or microelectromechanical (MEMS)-based detection mechanisms. [8][9][10] However, optical and MEMS sensor devices require their transduced signals to be Electrochemical sensors and systems have been utilised and simulated theoretically throughout the years, 32,[34][35][36][37] however, the majority of this work has been undertaken using quiescent conditions.…”

AirQuality Lab-on-a-Drone: A Low-Cost 3D-Printed Analytical IoT Platform for Vertical Monitoring of Gaseous H2S

“…Despite their ability to provide near real-time responses, low cost, low power supply requirements, and low weight and size, these sensors usually have limits of detection on the order of ppmv, and their applications in real-world scenarios are not well-grounded due to the lack of field validation and calibration . Additionally, MOX-based sensors are highly affected by changes in relative humidity. , On the other hand, gas sensors based on chemical methods that rely on a chemical collection of the analyte by a renewable reagent solution have been seen as an excellent alternative for gas sensing. , Chemical methods that measure an optical phenomenon as a result of the interaction between the reagent and the analyte have been adapted in many gas-sensing configurations with low limits of detection (i.e., ppbv range), high selectivity, easiness of use, low volume of reagent, fast response times, and low cost. – Moreover, due to the high availability of optoelectronic components and with the advent of 3D printing technology, the construction of small, inexpensive, versatile, low-energy consumption, and dedicated platforms that can be connected with Internet of Things (IoT) devices to control, collect and transmit data has been facilitated. – …”

Development of a portable optical device with a multi-channel spectrometer sensor for quantification of glycerol in wine: a maker approach for on-site analysis

“…5,6 By incorporating various sensors such as optical sensors, 2,7,8 electrochemical sensors, 9 and biosensors, 3,10 these devices exhibit exceptional sensitivity and selectivity, and are particularly valuable for food quality control and other applications. 2 Optical sensors, for instance, exploit the interaction of light with substances to measure parameters like reflectance, 7,8 fluorescence, 11 absorbance 11,12 or chemiluminescence. 13 The synergy between the DIY movement and IoT fosters innovation through accessible materials, open-source projects, and knowledge sharing, democratizing access to analytical chemistry and propelling advancements in substance analysis.…”