855 results about "Tweezers" patented technology

An optical image-driven light induced dielectrophoresis (DEP) apparatus and method are described which provide for the manipulation of particles or cells with a diameter on the order of 100 μm or less. The apparatus is referred to as optoelectric tweezers (OET) and provides a number of advantages over conventional optical tweezers, in particular the ability to perform operations in parallel and over a large area without damage to living cells. The OET device generally comprises a planar liquid-filled structure having one or more portions which are photoconductive to convert incoming light to a change in the electric field pattern. The light patterns are dynamically generated to provide a number of manipulation structures that can manipulate single particles and cells or groups of particles / cells. The OET preferably includes a microscopic imaging means to provide feedback for the optical manipulation, such as detecting position and characteristics wherein the light patterns are modulated accordingly.

Described herein are single-sided lateral-field optoelectronic tweezers (LOET) devices which use photosensitive electrode arrays to create optically-induced dielectrophoretic forces in an electric field that is parallel to the plane of the device. In addition, phototransistor-based optoelectronic tweezers (PhOET) devices are described that allow for optoelectronic tweezers (OET) operation in high-conductivity physiological buffer and cell culture media.

An optical image-driven light induced dielectrophoresis (DEP) apparatus and method are described which provide for the manipulation of particles or cells with a diameter on the order of 100 μm or less. The apparatus is referred to as optoelectric tweezers (OET) and provides a number of advantages over conventional optical tweezers, in particular the ability to perform operations in parallel and over a large area without damage to living cells. The OET device generally comprises a planar liquid-filled structure having one or more portions which are photoconductive to convert incoming light to a change in the electric field pattern. The light patterns are dynamically generated to provide a number of manipulation structures that can manipulate single particles and cells or groups of particles / cells. The OET preferably includes a microscopic imaging means to provide feedback for the optical manipulation, such as detecting position and characteristics wherein the light patterns are modulated accordingly.

The invention provides throughput type fiber optical tweezers based on a coaxial dual-waveguide structure and a dynamic control method. The tweezers mainly comprise a coaxial double-waveguide microstructure fiber (1), a wavelength-adjustable LD light source (2) and a standard single-mode single-core fiber (3), and are characterized in that the coaxial double-waveguide microstructure fiber (1) is coupled with the standard single-mode single-core fiber (3) in a fused-tapered mode; the other side of the standard single-mode single-core fiber (3) is connected with the wavelength-adjustable LD light source (2); and the other end of the coaxial double-waveguide microstructure fiber (1) is finely ground into a cone shape (103). Coaxial double-waveguide fiber is utilized to control particles, the throughput, emission and even resorption of the particles can be stably captured; and meanwhile, the throughput type fiber optical tweezers based on the coaxial dual-waveguide structure can capture the particles more flexibly and accurately and has adjustability, thereby greatly improving the practicability of the technology of the fiber optical tweezers.

The invention discloses a display method for a metallographic structure of an austenite and ferrite dissimilar steel joint. According to the display method, the operation is simple, rapid and safe, and an etching process is easy to control. The display method comprises steps as follows: (1), sampling: sampling is performed at the austenite and ferrite dissimilar steel joint; (2), preparation of etching solutions: the etching solutions comprise an electrolysis etching solution, an intermediate treatment etching solution and a chemical etching solution; (3), etching treatment of a dissimilar steel joint sample: a to-be-detected sample is clipped by a pair of anodic stainless steel tweezers and soaked into the electrolysis etching solution, the distance between an analysis surface of the to-be-detected sample and a cathode is enabled to be 5-20 mm, and the to-be-detected sample is etched for 2-10 s; the sample is soaked into the intermediate treatment etching solution, and the surface is wiped for 2-10 s; then the sample is soaked into the chemical etching solution and wiped until the surface is silver gray; finally, the sample is washed with clean water, absolute ethyl alcohol is dropwise added to the sample, and the sample is blow-dried by a blower; (4), the sample is subjected to microexamination. The display method is simple to operate, convenient and rapid to use, good in repeatability and suitable for daily batch inspection and has great guiding significance for production.