A fiber-optic relative sensor for real-time UV cure monitoring is presented. Its operational principle is based on the density-dependent variation on the refractive index of materials along with the ...Fresnel reflections from the interface between the fiber end and UV adhesive. Both the experimental and theoretical analyses are investigated in detail. The experimental data of refractive indices are measured during the curing processes under different UV intensities, which can be fit with two-term exponential equations. As observed, it shows less time consumption with higher UV intensity. The time coefficients of the curing process are estimated and explained explicitly. The proposed cure monitoring sensor has a reliable and concise structure.
•The SCPCF with high mechanical strength and four air holes were used to form modal interferometer.•Seawater temperature and salinity can be simultaneously measured in one integrated all-fiber ...sensor.•The proposed structure has the advantages of high mechanical strength and simple manufacturing process.•The temperature sensitivity of 1.486 nm/°C and salinity sensitivity of 2.495 nm/‰ were realized.
An optical fiber sensor for simultaneous measurement of seawater temperature and salinity was designed and implemented based on a lateral offset Modal interferometer (MI) using a suspended core photonic crystal fiber (SCPCF). The MI was made by fusing single mode fiber and multimode fiber (SMF-MMF) structures with a lateral offset SCPCF coated with UV adhesive film on the inner wall. In the experiment, the response of the sensor to the change of seawater temperature and salinity was measured respectively. The results have shown that the temperature sensitivity of 1.486 nm/°C was obtained within the temperature range from 5 °C to 45 °C and the salinity sensitivity of 2.495 nm/‰ was obtained within the salinity range from 0‰ to 50‰. The sensor resolves the problem of cross-sensitivity between seawater temperature and salinity and provides a simple structure with low cost and high sensitivity.
During making the surface acoustic wave devices and integrated circuit hybrid integrated electronics, it needs to put the piezoelectric crystal and silicon wafer bonding together. By selecting a ...certain wavelengths of UV curing adhesive, then exposing with 300-436nm wavelength of exposure machine, 8mm×8mm bonding chips are got. Bonding LiNbO3, quartz and silicon wafer respectively, measured maximum shear force is 116.2 N and 117.9 N with shear force test machine. The fracture energy is 5.831 J/m2 measured by crack-opening method test LiNbO3 bonding chips. The results show that piezoelectric crystal and silicon wafer bonding interface level off and the bonding of the middle layer thickness for about 3 microns observed the bonding section with SEM.
In this paper, we propose and demonstrate a fiber-optic extrinsic Fabry-Pérot interferometer (FPI) sensor based on an ultraviolet (UV) adhesive diaphragm for very-low-frequency acoustic sensing. The ...sensing diaphragm is formed by the surface tension of UV adhesive solution and exhibits a good acoustic response from 1 Hz to 20 kHz. The sensor has a sensitivity of 57.3 mV/Pa at 1000 Hz and a flat frequency response ranging from 1 to 2000 Hz with a small fluctuation of about ±1.5 dB. The good response of infrasound and rather simple fabrication process make it a wonderful candidate for very-low-frequency acoustic sensing.
Adhesive work holding can be used to minimize clamping distortion and provide greater access to a work piece during machining. This paper proposes shear and tensile strength criteria to evaluate the ...work holding strength of adhesive grippers and definition of a strength safety coefficient of adhesive grippers. It also demonstrates a case study of work holding design with an UV adhesive for a grinding process based on a strength criteria explained in the paper. A test rig has been designed and manufactured to assess the capability of an adhesive work holding material. Tests include measurement of strength and repeatability of adhesion under different film thicknesses, curing times and pre-cleaning methods. The test shows the strength repeatability is less than ± 20%, which is good enough for many work holding applications. A shear-tensile combined strength can be evaluated by the strength sphere in a fixture design of a specific part geometry for production by the combined safety coefficient. Following the test rig assessment, a fixture has been designed with 3 grippers to demonstrate the adhesive for a grinding process with a simple part geometry. The method has a high potential for application in industry, and is not limited to the given part geometry and machining method. The grinding test shows that the adhesive work holding is strong enough for the application and that similar results can be expected for milling and turning with a good gripper arrangement.
This study is aimed at traditional vegetable grafting using a large number of plastic clips, which cannot be recycled in time and cause serious pollution within the planting environment. This paper ...proposes a new grafting method based on a UV adhesive instead of plastic clips. First of all, a UV adhesive spray grafting device was designed. The structure includes seedling adsorption positioning mechanisms, a butt joint mechanism, a handling mechanism, a spray valve, a UV curing lamp, etc., to facilitate the adhesive spraying. For the rootstock and scion, a horizontal, lateral seedling and negative pressure adsorption and positioning method is adopted, with fluid dynamics simulation of the diameter and quantity of the adsorption holes in the rootstock adsorption mechanism carried out using Fluent 2022 R1 software and completion of the optimization of the parameters of the adsorption and positioning mechanism. The fluid volume method is used to simulate the adsorption and positioning mechanism. For optimization, the volume of fluid method (VOF) and the discrete particle method (DPM) are used in a coupled simulation of the UV adhesive spraying process, and the value range of the spraying influencing factors is determined: the selected glue pressure, atomization pressure, and spraying height for three-factor, three-level orthogonal simulation. A grafting test is also verification, deriving the significance ranking of their impact on the success rate of the grafting: atomization pressure > spraying height > glue pressure. Under the condition of a 0.25 Mpa atomization pressure, a 0.15 Mpa glue supply pressure, and a 10 mm spraying height, the grafting success rate for watermelon was 100%, the effective spraying rate was 83.03%, the healing success rate was 94.5%, and the length of the film was 7.86 mm. The results of the study can provide a research basis for the research and development of new types of spraying and grafting robot technology.
Abstract Multicellular spheroid models have been recognized as superior to monolayer cell cultures in antitumor drug screening, but their commercial adaptation in the pharmaceutical industry has been ...delayed, primarily due to technological limitations. The current study presents a new spheroid culture platform that addresses these technical restrictions. The new culturing device is based on a multiwell plate equipped with a glass bottom patterned with an array of UV adhesive microchambers. Each microchamber is designed to accommodate a single spheroid. The system facilitates the simultaneous creation and culturing of a large number of spheroids, as well as screening their response to antitumor drugs. The volume of the spheroids is easily controlled by seeding density. The location of each spheroid is preserved in the same microchamber throughout its growth, treatment with soluble agents, and imaging. The growth ratio parameter, a non-intrusive size analysis of the same spheroid before and after exposure to drugs, was found to be a sensitive indicator for the reaction of MCF7 breast cancer spheroids to cytotoxic drugs. This feature helps reveal the heterogeneity within the spheroid population during the formation process and their drug response, and provides an opportunity to detect specific, highly active or drug-resistant spheroid sub-groups. The advantages of this spheroid-based system make it an efficient drug-screening tool that may be valuable to related fields of research and clinical applications.
We present a simple and universal method for irreversibly bonding rigid substrate-based microfluidic devices at room temperature. In this method, a pre-patterned self-adhesive film covers and seals ...the area of the rigid substrate containing microchannels to create a closed microfluidic system, and then an adhesive-assisted sandwich bonding is used to reinforce the strength of bonding. The bonding can be achieved in 10 min at room temperature without requiring cleanroom facilities, complex surface modification, or employing rigorous cleaning. Despite its simplicity, this bonding method can create high-performance microfluidic devices with burst pressures over 2 MPa, but without channel clogging or microstructure deformation. The universality of this bonding method is demonstrated by applying it to the production of microfluidic devices with various rigid substrates. The simplicity, low cost, and universality of our method should allow it to be adopted by researchers lacking access to cleanroom facilities.
This research focuses on the conservation-restoration of a reverse glass painting produced by Auguste Scévenels. This artwork presents alterations in the glass support. The objective is to propose ...firstly a method of assembly and secondly to use an innovative technology for the restoration of the glass panel : UV polymerisation adhesives.
A technique that saved phosphor use by 150% was applied to warm white light-emitting diodes containing composite colloidal photonic crystals (c-CPhCs) to develop an electrical source of candlelight ...that exhibits a high luminous flux (52 lm) and a high color-rendering index (CRI; 94). This physiologically friendly light source, which was designed to mimic the color temperature of candlelight, provides at least eight-times more luminous flux than traditional candles do. Furthermore, a UV-based adhesive curing method for enhancing the adhesion properties of c-CPhCs was also developed. A novel, inexpensive technology was implemented to produce high-CRI candlelight LEDs for use as a residential light source.
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