Abstract:
Provided isa design of a novel photonic bandgap fiber structure for Coherent Anti-Stokes Raman Scattering (CARS) endoscope system. The fiber proposed herein is a solid-core dual- cladding photonic bandgap fiber, which guides a beam only in a specific wavelength (the wave length of pump and Stokes beams) by a photonic bandgap effect. Also, the fiber has a wide core area capable of inhibiting a non-linearity of the guided pump and Stokes beams and shows, at the same time, a low dispersion property in an operation region by the bandgap waveguide effect. Furthermore, the proposed fiber includes a dual cladding fiber structure with a high numerical aperture (> 0.5).
Abstract:
There is provided a design for the structure of a novel photonic crystal fiber for implementing a coherent anti- Stokes Raman scattering (CARS) endoscope system. The photonic crystal fiber is a double -cladding polarization maintaining photonic crystal fiber with large mode area. The proposed photonic crystal fiber has a highly birefringent core mode whose effective area is a few to a few tens times larger than that of a normal single mode fiber while maintaining a spatially single mode in the operational region. Such characteristics maximally reduce nonlinear distortion of high-power pump and Stokes laser pulses used in CARS imaging, thereby preventing generation efficiency of CARS signals passing through the waveguide from being lowered. Simultaneously, a double cladding structure having a high numerical aperture is introduced, thereby collecting weak CARS signals at high efficiency. When comparing the proposed photonic crystal fiber with the normal single mode fiber, a high-performance CARS endoscope system with more enhanced sensitivity can be implemented.
Abstract:
The present invention relates to a touch input structure for detecting intensity and an action position of a pressing force, and more specifically, to a touch input structure, a touch input apparatus, and a touch detection method, which can detect intensity and an action position of a pressing force based on change of a space between an upper layer and a lower layer of the touch input structure or strain of the upper layer.
Abstract:
The present invention relates to an apparatus and method for measuring ultrasound power using latent heat, and more particularly, to an apparatus and method for simply measuring ultrasound power in which the net weight of water generated through a process in which ice is melted and changed into water is measured and thus the ultrasound power can be simply measured by using the measured weight of the water and the specific latent heat of the water. To this end, the present invention provides an apparatus for measuring ultrasound power, which comprises an ultrasonic transducer for receiving an electrical signal and transducing the electrical signal to an ultrasonic wave; an electrical signal generation unit for supplying the ultrasonic transducer with the electrical signal; a mount capable of moving upward and downward, the ultrasonic transducer being fixed to the mount; a mixing container having an open upper face to receive the ultrasonic transducer therein and detachably fastened to the mount, the mixing container being formed with a plurality of drain holes; a pail-shaped insulation chamber having an open upper face to receive the mixing container therein; and an electronic scale for measuring the weight of water contained in the insulation chamber.
Abstract:
An apparatus and method for measuring the specific heat of a tri-state material using supersonic waves are provided, which can measure the specific heat of a tri-state material including gas, liquid, and solid without damaging or harming the tri-state material. The apparatus includes a tub, a supersonic wave generator, a plurality of temperature sensors, and a computer. The tub stores an amount of distilled water which can immerse a sample. The supersonic wave generator emits a supersonic wave at the sample. The temperature sensors measure a temperature of the sample heated by the supersonic wave emitted by the supersonic wave generator. The computer receives and stores a temperature signal measured by each of the temperature sensors and calculates a specific heat of the sample from a corresponding temperature.
Abstract:
Disclosed are a touch screen using tactile sensors, which can adjust the density of an object to be displayed on a screen on the basis of the variation of a contact position and a contact force and achieve a multi-touch recognizing function, a method for manufacturing the same, and an algorithm implementing method for the same. The touch screen using tactile sensors includes a lower display panel such as a liquid crystal display (LCD), a transparent upper substrate, and a plurality of tactile sensors arranged between the upper substrate and the lower panel along the edge of the screen. The touch screen senses a contact position and a contact force on the basis of an electrostatic capacity or contact resistance generated from the tactile sensors, and has a multi-touch recognizing function.
Abstract:
A shape measurement apparatus and method using a laser interferometer are disclosed. The shape measurement apparatus includes a plurality of laser devices, which generate beams, emit a beam of a specific frequency from among the generated beams, and output interference signals for detecting wavelengths of the generated beams, and a controller for detecting the wavelengths of the generated beams from the outputted interference signals, and controlling the laser devices on the basis of the detected wavelengths. The optical unit projects the beam of the laser device on a target object, and generates an interference pattern of the object. Several shutters are closed and opened. If the shutters are closed, they prevent the beam of each laser device to be projected on the optical unit. An image pickup unit captures the interference pattern.
Abstract:
A performance inspection system for an array ultrasound transducer includes: a driver for selectively applying an electric signal to all or some parts of constituent channels of the array ultrasound transducer; an acoustic power measurement unit for measuring an ultrasound acoustic power emitted from individual channels receiving the same voltage from the driver; a radiation conductance conversion unit for measuring a voltage signal applied to each channel although the driver applies different voltages to the individual channels, and converting the measured voltage into an ultrasound acoustic power acquired when the same voltage is applied to the channels; and a channel uniformity estimation unit for estimating uniformity of the acoustic power value acquired by the radiation conductance conversion unit or uniformity of acoustic power values of the individual channels measured under the same voltage.
Abstract:
The present invention relates to a replaceable electro- conductive coupler for electro-osmotic flow driven ultra small volume pipetting device which can replace an electro- conductive coupler for precisely sucking and discharging (pipetting) an ultra small volume of sample such as sucking and taking of a single cell sample, or discharging and injecting of a foreign substance in to the single cell.
Abstract:
The present invention is related to a biosensor for detecting presence and concentration of various bio-materials such as genes and proteins by the electrical method, an interdigitated electrode sensor unit for forming the biosensor and a method for measuring concentration of a bio-material using the biosensor. The biosensor according to the present invention comprises a plurality of independently-operating interdigitated electrode senor units integrated on a substrate, wherein each interdigitated electrode sensor unit comprise: first electrode and second electrode formed interdigitatedly and spaced from each other on the substrate; and a sensor- immobilized biomolecule receptor immobilized on the substrate exposed between the first electrode and the second electrode so that the first electrode is electrically connected to the second electrode upon binding to a biomolecule and specifically binding to the biomolecule, wherein the biomolecule is analyzed by the number of the interdigitated electrode sensor units electrically connected by the biomolecule captured by the sensor-immobilized biomolecule receptor.