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Diffusion, Thermal, and Optical Properties of Perovskites
Published in Gibin George, Sivasankara Rao Ede, Zhiping Luo, Fundamentals of Perovskite Oxides, 2020
Gibin George, Sivasankara Rao Ede, Zhiping Luo
Transmittance is a measure of incident light transmitted through a medium. Transparent perovskites can be obtained by limiting them with no impurities or pores, especially at grain boundaries during the sintering process of the precursors. Further, the transparency of perovskites can be optimized by applying an external electric field. For instance, Pb1−xLax(Zr1−yTiy)1−x/4O3, which is also written as PZLT (x/1−y/y), especially, PZLT with x, y composition (8/70/30) shows this effect, and they are used in attenuators and light modulators without using adjunct polarizers (Yang et al. 2016).
Review of Video Imaging Techniques for Estimating Dermal Exposure to Pesticides
Published in Donald J. Ecobichon, Occupational Hazards of Pesticide Exposure, 2020
Donna Houghton, Bruce A. Archibald, Keith R. Solomon
Reflectance helps make targets visible; however, transmittance is more commonly measured in life-science densitometry. Transmittance decreases as a specimen absorbs more of the incident illumination; therefore, there is an inverse relationship between transmittance and darkness.
Plastic optical fiber chemosensor for mercury detection in aqueous solution
Published in Gin Jose, Mário Ferreira, Advances in Optoelectronic Technology and Industry Development, 2019
Junsoo Hong, Hojin Lee, Jaehee Park, Taeuk Ryu, Min Soo Noh, Sang-Won Park
After rhodamine derivative was partially filled with the rectangular in-fiber hole in the POF, the transmittances (optical power measured at any ppm/optical power measured at 0 ppm) of the POF chemosensor were measured along with mercury concentration. Figure 5 shows the transmittance of the POF chemosensor measured according to the mercury concentration. The transmittance decreases as the concentration increases. These results explain that the POF chemosensor based on the in-fiber hole and rhodamine derivatives can be used for detection of mercury ions in aqueous solution.
Highly sensitive and transparent flexible temperature sensor based on nematic liquid crystals
Published in Liquid Crystals, 2022
Keming Wu, JingJing Sun, Lin Gao, Hongyu Xing, Minglei Cai, Tongzhou Zhao, Changyong Yang, Wenjiang Ye, Xiangming Kong
In summary, we have demonstrated a flexible LC temperature sensor based on the NLC (1M0921900-000) and the flexible ITO-PET substrate, which has the advantages of high transparency, fast response, low power consumption, and high sensitivity. The transmittance of the sensor can reach 62.36–81.13% in the visible light range. The linear fitting coefficient of ln(τ) to temperature in the plane state at 0.1 V and 200 Hz is 0.99742, and the sensitivity is −4.05%/°C. Under curvature radii of 6 cm, 4 cm, and 2 cm, the corresponding linear fits of ln(τ) to temperature are 0.99774, 0.99635, 0.99265, and the sensitivities are −3.69%/°C, −3.81%/°C, −3.67%/°C, respectively. Compared with the rigid LC temperature sensor, the rise time and decay time of the flexible LC temperature sensor are reduced by 97.104% and 90.313%, respectively, which proves it has the properties of rapid response. In addition, the performance test of the flexible LC temperature sensor proves that it has the advantages of excellent stability, recovery, and durability. In the practical application, temperature monitoring by attaching the sensor to the finger and array experiment, the sensors are well realised the sensing function of the target. This research has important application value in the fields of robotics, prosthetics, human–machine interfaces, and health-monitoring fields and so on.
A multilayer perceptron artificial neural network model for estimation of ultraviolet protection properties of polyester microfiber fabric
Published in The Journal of The Textile Institute, 2021
Can Eyupoglu, Seyda Eyupoglu, Nigar Merdan
According to the results, the UV absorbance free undyed fabric has the highest transmittance value compared with other samples containing UV absorbance. As the UV absorbance concentration increases, the transmittance values of the samples decrease. UV absorbing substances prevent disintegration of polymers and transform UV energy to heat energy. Such substances capture the activated molecules and return them to the basic state, thereby preventing bond rupture (Gezer & Merdan, 2010; Lee et al., 2004; Rupp et al., 2001). It was concluded that the aromatic structure of UV absorbance caused to decrease the transmittance values of the samples. Compared with synthetic and natural fibers, synthetic fibers have higher UV absorbance capacity. Furthermore, polyester fibers have high UV absorbance capacity due to their aromatic structure (Srinivasan, 1999). The results show that aging test leads to reduction in the protection of UVR. Aging test is deemed to destroy the structure of UV absorbers in the samples, resulting an increase in the transmission of UV rays. Table 2 shows the UPF, UVA and UVB values of undyed samples before and after aging test.
Role of BaTiO3 nanoparticles on electro-optic performance of epoxy-resin-based PDLC devices
Published in Liquid Crystals, 2021
It and Io are the transmitted and incident light, α and β are the scattering and absorption coefficient of the film, respectively, and d is the thickness of the sample. Here, ε is the extinction coefficient of dopant material, x is the concentration of dopant material and l is the ratio of distance travelled by light through the film thickness. The films are prepared by using the same material and under identical conditions, therefore the value of scattering coefficient α of the different films differs only due to the difference in the size of droplets formed and the alignment of the droplet axes. The polymer and the LC molecules absorb negligible amount of visible light. Hence, the rise in the absorption coefficient value of the PDLC film is due to the dopant nanoparticles [47,48]. As the concentration of the nanoparticle increases, both the coefficients increase as shown in Figure 10(c,d). Therefore, the off light transmittance decreases as the concentration increases. Due to which there is a remarkable improvement in the CR ratio value.