Abstract: The invention discloses a control method of optical cutting. A laser processing module is used to generate a cutting heat source and an auxiliary heat source. The control method of optical cutting includes the steps of determining a cutting path on the work piece first; then calculating a thermal stress distribution along the cutting path according to a heating condition; next determining an irradiation condition for the auxiliary cutting heat source according to the thermal stress distribution induced by the cutting heat source; and irradiating the work piece along the cutting path with the cutting heat source and simultaneously irradiating the work piece with the auxiliary cutting heat source. The cutting of the work piece is therefore finished.

Abstract: The invention discloses a control method of optical cutting. A laser processing module is used to generate a cutting heat source and an auxiliary heat source. The control method of optical cutting includes the steps of determining a cutting path on the work piece first; then calculating a thermal stress distribution along the cutting path according to a heating condition; next determining an irradiation condition for the auxiliary cutting heat source according to the thermal stress distribution induced by the cutting heat source; and irradiating the work piece along the cutting path with the cutting heat source and simultaneously irradiating the work piece with the auxiliary cutting heat source. The cutting of the work piece is therefore finished.

Abstract: Path imbalance measurement of the two arms fiber optic interferometer includes employing a current carrier signal to modulate the semiconductor laser light source of the interferometer to let it output interference signals to generate a carrier phase signal through path imbalance of the interferometer. Then, the interference signals are expanded to be the harmonic components of carrier phase signal frequency by Bessel function. Subsequently, we use the specific relation between the second and the fourth harmonic components of the interference signals to develop the theory of path imbalance measurement. The method mentioned above can measure a few decimeters of path imbalance and its accuracy can reach to a millimeter.

Abstract: A ceiling fan mounting system includes a mounting bracket for fixing the ceiling fan mounting system, and a canopy. The mounting bracket includes a flange comprising an external peripheral surface, the external peripheral surface having at least one locking hole thereat. The canopy includes a sleeve joint adapted to receive and nest the flange of the mounting bracket. The canopy has at least one elastic blocker corresponding the at least one locking hole, in assembly, the at least one elastic blocker being embedded in the at least one locking hole.

Abstract: A counting signal processing method for a fiber optic interferometric sensor including following steps is provided. An output intensity of the fiber optical interferometric sensor is converted into an electrical signal having the form V0+V1 cos ?(t). Then, the number of times N1 that the maximum peak values are greater than a first counting level S1 and the number of times N2 that the minimum peak values are smaller than a second counting level S2 within a specific period of time TC are counted. When the value of N1, N2 or (N1+N2) is greater than a threshold counting number Cth, a detectable induced signal occurring in a sensing area is inferred. Then, whether the detectable induced signals are caused by an intruder or otherwise is judged through an alarm identification logic, and an alarm device is triggered to send out an alarm according to the result of the judgment.

Abstract: A counting signal processing method for a fiber optic interferometric sensor including following steps is provided. An output intensity of the fiber optical interferometric sensor is converted into an electrical signal having the form V0+V1 cos ?(t). Then, the number of times N1 that the maximum peak values are greater than a first counting level S1 and the number of times N2 that the minimum peak values are smaller than a second counting level S2 within a specific period of time TC are counted. When the value of N1, N2 or (N1+N2) is greater than a threshold counting number Cth, a detectable induced signal occurring in a sensing area is inferred. Then, whether the detectable induced signals are caused by an intruder or otherwise is judged through an alarm identification logic, and an alarm device is triggered to send out an alarm according to the result of the judgment.

Abstract: A fiber-optics multiplexed interferometric current sensor is provided. A broadband light source (BLS) is adapted for providing a light wave, and a depolarizer is coupled to the BLS. A depolarizer and a wave detector are respectively coupled to a first port and a third port of an optical spliter. A passive demodulating interferometric module is coupled between a second port of the optical spliter and a sensor module array. Further, the sensor module array includes an optical coupler coupled to the other port of the passive demodulating interferometric module, multiple leading fibers coupled to the other port of the optical coupler, multiple reflectors, and multiple fiber sensing heads. A port of each fiber sensing head is coupled to the other port of the corresponding leading fiber, and the other port of each fiber sensing head is coupled to a reflector. Each fiber sensing head winds on the corresponding wire.

Abstract: The present invention relates to an outsole-making process, wherein the materials for outsole and central pad are refined. There is an opening at the front thenar of the outsole. The central pad and the outsole are placed inside the bottom of the mold sequentially with the central pad inset into the opening of the outsole. After putting on the cover, the mold is shaped up through the process of heat and sulphuration. Finally, the finished outsole is taken out for inspection and trimming before shipment.

Abstract: An on-line Sagnac interferometric distributed fiber-optic leakage detection device comprising a light generator, an optical fiber coupler, a hollow pipeline, a Faraday rotator mirror, a sensing optical fiber, a delaying optical fiber, a photo detection device and a spectrum analyzer. Signals resulting from a leaky pipeline are obtained by the linear leakage detection system. The signals are analyzed by the spectrum analyzer to discover any null frequency shift so that exact location of the leakage point along the hollow pipeline can be computed.

Abstract: A polarization-insensitive fiber-optic interferometric sensor system has an erbium-doped fiber amplifier (EDFA) at a location between a light source and a sensing array to serve as a post amplifier. An output end of the sensing array is coupled to another EDFA, and further coupled to a receiver, in which this another EDFA is used as an in-line amplifier. As the sensor system is applied for a light source with multiple wavelengths, a dense wavelength division multiplexers (DWDMs) is used to combine the multiple wavelengths into one for amplification, and another DWDM is used to decouple the multiple wavelengths.

Abstract: An on-line Sagnac interferometric distributed fiber-optic leakage detection device comprising a light generator, an optical fiber coupler, a hollow pipeline, a Faraday rotator mirror, a sensing optical fiber, a delaying optical fiber, a photo detection device and a spectrum analyzer. Signals resulting from a leaky pipeline are obtained by the linear leakage detection system. The signals are analyzed by the spectrum analyzer to discover any null frequency shift so that exact location of the leakage point along the hollow pipeline can be computed.

Abstract: An optical intensity modulator with optimized extinction ratio (ER) is provided. The optical intensity modulator has a modulator used to receive a light source, such as a laser source, and export an optical pulse. An optical divide is used to receive the optical pulse and decouple it into a first optical pulse and a second optical pulse. An optical receiver is used to receive the first optical pulse and convert it into an electrical pulse signal. A signal processor is used to receive the electrical pulse signal from the optical receiver and digitize it into a digital reference signal. A DC-bias generator coupled to the signal processor and the modulator is used to provide a precise DC bias to the modulator according to an output of the signal processor. A current reference signals is compared with a previous reference signals and is adjusted in the signal processor so as to obtain the precise DC bias.

Abstract: A method of calibrating a three-axis magnetometer is provided. In accordance with the method, calibration is effected by first establishing a three-axis magnetic field simulator having a center position portion. Suitable measures are taken to substantially compensate for the earth's magnetic field at least at that center position portion. A three-axis magnetometer is then disposed in the magnetic field simulator and successively actuated in predetermined manner to generate a set of measured parameter values. The measured parameter values are normalized using a predetermined standard output factor, and a square pre-calibration matrix C is generated from the normalized measured parameter values. An inverse matrix operation is thereafter performed upon the pre-calibration matrix C to generate a square calibration matrix D having a plurality of coefficients respectively indicative of orthonormal compensation coefficients.

Abstract: This invention concerns with a time-division multiplexing system of polarization-insensitive Michelson interferometric fiber optic sensors, where the compensating interferometer is equipped with a 3.times.3 coupler. It uses the two reflections from the Faraday rotator mirrors of sensor interferometer and compensating interferometer, respectively, in a totally passive manner, to overcome the polarization-induced signal fading in the multiplexing sensor system. The compensating interferometer with matching optical paths is used to reduce the phase-induced intensity noise, at the same time it allows the use of laser source with proper coherence length to reduce the crosstalk between sensors and the crosstalk caused by Rayleigh scattering. This system allows the use of low-loss conventional single-mode optic fiber as lead fiber, and offers advantages in building the fiber optic sensor array system with long-distance lead fiber.