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Impact of Humidity-Sensing Technology on Clean Energy Generation
Published in Deepti Agarwal, Kimmi Verma, Shabana Urooj, Energy Harvesting, 2023
The electrical characteristics were determined by holding the sensors inside the desiccator which contain saturated salt solution. Saturated salt solutions of varying relative humidity were used. The lowest RH (10%) was obtained by placing hot silica gel inside the desiccator, and the highest (99%) humidity was obtained using DI water. Other saturated salt solutions were used to get humidity levels between 10% and 99%. The sensors were shielded properly to guard against stray capacitances. An LCR meter was used to measure capacitance values at different humidity values as well as at different frequencies, and the curve can be plotted as shown in Figure 7.3. LCR meter is an instrument used to measure inductance (L), capacitance (C), and Resistance (R).
Binary micellar schemes of cationic gemini and conventional surfactants: chain length effect
Published in Journal of Dispersion Science and Technology, 2022
Smarling Suting, Tariq Ahmad Wagay, Anushmita Charingia, Hassan Askari
Electrical conductance of surfactants solutions was measured using a Wayne Kerr 6440B (Wayne Kerr, UK) automatic precision bridge equipped with a dip-type cell. This LCR meter has 0.01 nS resolution and measures conductance with an accuracy of 0.05%. It has an averaging facility and averages 2 (‘Average’ 1) to 128 (‘Average’ 9) measurements in a time span of about 670 ms to 36 s, respectively. Before performing experiment, the instrument was calibrated through KCl solution having a certain concentration. For conductance measurement, adequate quantity of stock solution was added with a Finn pipette to a known amount of water in a glass vessel placed in a thermostat maintained at 25 °C (±0.1) using a Haake D8 circulation bath. After each addition, the mixture was stirred well and allowed to attain thermal equilibrium before recording the conductance.
Fabrication of an anodized porous alumina relative humidity sensor with improved sensitivity
Published in Instrumentation Science & Technology, 2020
The electrical response due to the variation of the capacitance of the sensor with the humidity was measured with a Keysight hand held LCR meter (U1733C) at 1 KHz signal frequency. The accuracy of the LCR meter was ∼±0.2% for the capacitance range from 0 to 20 nF at 1 kHz. The capacitance response was determined for increasing and decreasing humidity. Necessary precautions were taken to record the capacitance values. The sensor inside the chamber was given sufficient time (20 min) to reach the equilibrium vapor condition and then the capacitance values were noted. Each capacitance value at each humidity value was recorded at least five times. The standard deviation of the readings was found to be less than 0.1%.
Effect of coil design parameters on performance of electromagnetic forming process
Published in Materials and Manufacturing Processes, 2022
Manoj Soni, Meraj Ahmed, Sanjay Kumar Panthi, Surendra Kumar
The coil is used with field shaper for enhancing and concentrating electromagnetic field at a particular region. Field shaper is placed inside the coil. The magnetic field is developed by the coil and it is coupled with field shaper and workpiece. Measurement setup of LCR meter (keysight make) is shown in Fig. 4. The operational frequency range of LCR meter is 20 Hz to 2 MHz at 1 V test signal. The measurement of inductance and resistance is carried out at frequency range 1 Hz to 15 kHz. Kelvin clip is used as a connecting lead to hold the test specimen in the LCR meter.