- 标题
- 摘要
- 关键词
- 实验方案
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Compensation method of error caused from maladjustment of optical path based on microfluidic chip
摘要： Photometric detection plays a significant role in microfluidics technology. However, the mismatch between the solution concentration and the optical path length will increase detection error. In this study, we proposed a round microfluidic chip for concentration detection to obtain the continuous gradient distribution of concentration. The optimum absorbance can be found by dynamic accurately searching. The solution concentration will be accurately calculated finally according to the relationship between arc length and solution concentration. The overall detection process runs automatically. Under the optimization of injection velocity and concentration, the experimental result shows that the compensation ratio increases as the solution concentration increases. The compensation ratio in the detection of pesticide residue has already reached 14.22% and the reproducibility is acceptable. Therefore, this novel method lays the theoretical foundation for the research of high precision microfluidic photometric detection equipment.
关键词： Microfluidics,concentration detection,photometric detection,optical path length
更新于2025-09-23 15:23:52
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Review: Surface Texturing Methods for Solar Cell Efficiency Enhancement
摘要： Demand for renewable energy continually increases due to environmental pollution and resource depletion caused by the increased use of fossil fuels. Among the various renewable energies, the solar cell developed by numerous researchers has been widely used because of its advantages, including ease of use and low maintenance cost. However, problems, such as efficiency, waste treatment, and light pollution, also raise concerns. The largest drawback of solar cell has been the low energy conversion efficiency arising from optical loss. To improve solar cell efficiency, numerous studies have been conducted, and thus, various solutions were developed in recent decades. In this review, the principle and application of surface texturization methods utilizing micro/nano scale structure on the surfaces of solar cells are elaborated in detail. These texturized surfaces with unique optical properties can be implemented as anti-reflective or light-trapping interfaces to reduce optical loss and thus enhance the efficiency of solar cells. Optical properties of texturized surfaces and applied examples are introduced in this review.
关键词： Optical path length enhancement,Nano structure,Micro structure,Solar cell,Anti-reflection
更新于2025-09-19 17:13:59
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Adjustable Optical Path Length Compact Spherical Mirrors Multipass Cell Optimized with Genetic Algorithm
摘要： Numerous practical applications, including health and environmental protection, need compact and high sensitivity gas sensors. This work reports an experimental investigation on a compact multipass cell (MPC) designed and optimized with a genetic algorithm (GA) with long, adjustable optical path length (OPL) using only inexpensive spherical mirrors. A four-mirror based MPC with the GA developed here, offers great design flexibility in comparison to a two-mirror solution. As an example, a stable 24 m OPL was reached within only 80 cc volume. Moreover, by changing the mirror positions various stable OPLs can be achieved in a controllable way. The presented MPC consists of four mirrors in a configuration similar to a bow-tie. As a result, the symmetry between the mirrors is broken (mirrors are not parallel to each other) and an astigmatic spot pattern with a high fill factor is obtained. Additionally, the use of the folded optical path geometry causes higher compactness in contrast to an astigmatic mirror-based MPC. Compared to other dense-pattern or folded spherical mirrors MPCs reported previously, longer OPL in the same volume can be obtained. In order to accurately calculate the line-sphere intersection points and reflection angles based on algorithms reported in custom ray tracing software was developed. It also allows to determine the optimal MPC configuration with specified design constraints (mirror diameters, their focal lengths and desirable OPL) by using a GA. To verify the simulation results, we assembled a MPC with four 1” in diameter, 25 mm focal length mirrors mounted in kinematic holders and fixed them to an aluminum base. By changing the angle and distance between the mirrors, different MPC configurations were tested. Several OPLs ranging from 4.5 m to 28 m were achieved with the GA. The longest OPL, with sufficient output beam quality for such mirrors, was 24 m. In order to prove the agreement between the simulation and experiment, a 16 m and 24 m OPL configurations were prepared and the time-of-flight inside the MPC was measured by injecting a 10 ns pulse laser into the cavity. The first pulse (registered at 0 ns delay in Fig. 1c) corresponds to light partially reflected from the optical plate situated near the MPC input, whereas the second one arrives from the output of MPC. By measuring the time delay between both pulses, the actual OPL was calculated. The experimentally obtained OPLs were 16.11 m and 23.88 m, which is in good agreement with the simulated values of 16.1 m and 23.82 m respectively. In conclusion, we present a compact, four-mirror MPC, designed and optimized with a GA in several OPL variants. Then two of them were experimentally verified through time-of-flight measurement inside the MPC.
关键词： optical path length,genetic algorithm,spherical mirrors,multipass cell,gas sensors
更新于2025-09-12 10:27:22