Abstract: A self-calibration detection device and a temperature demodulation method oriented to a fiber Raman temperature sensing system. The self-calibration detection device comprises a fiber Raman thermodetector, thermostatic baths, a multi-mode sensing fiber, and a multi-mode reflector. The fiber Raman thermodetector comprises a pulsed laser whose output end is connected to the input end of a WDM. Two output ends of the WDM are respectively connected to input ends of a first and second APDs. Output ends of the first and second APDs are respectively connected to input ends of a first and second LNAs. Output ends of the first and second LNAs are connected to the input end of a data acquisition card whose output end is connected with the input end of a computer. The temperature demodulation method can solve the problems of low temperature measuring accuracy, lower temperature measurement stability and low temperature measurement efficiency.

Abstract: A temperature demodulation method oriented toward a distributed fiber Raman temperature sensing system, the method comprising the following steps: step 1 of constructing a high-precision temperature detection device oriented towards a distributed fiber Raman sensing system; step 2 of performing signal processing with respect to Stokes light and anti-Stokes light at a calibration stage; step 3 of performing signal processing with respect to Stokes light and the anti-Stokes light at a measurement stage; and step 4 of obtaining a high-precision temperature demodulation technique oriented toward the distributed fiber Raman sensor. The method is used to effectively resolve the issue of low temperature measuring accuracy caused by Rayleigh crosstalk in existing distributed fiber Raman temperature measurement systems, and temperature measurement accuracy thereof is expected to fall within ±0.1° C. The method is applicable to distributed fiber Raman temperature measurement systems.

Abstract: An InP-based monolithic integrated chaotic semiconductor laser chip capable of feeding back randomly diffused light, being composed of six regions: a left DFB semiconductor laser, a bidirectional SOA, a left passive optical waveguide region, a doped passive optical waveguide region, a right passive optical waveguide region, and a right DFB semiconductor laser, specifically including: an N+ electrode layer, an N-type substrate, an InGaAsP lower confinement layer, an undoped InGaAsP multiple quantum well active region layer, doped particles, distributed feedback Bragg gratings, an InGaAsP upper confinement layer, a P-type heavily doped InP cover layer, a P-type heavily doped InGaAs contact layer, a P+ electrode layer, a light-emitting region, and isolation grooves. It effectively solves problems of bulky volume of the existing chaotic laser source, the time-delay signature of chaotic laser, narrow bandwidth, and low coupling efficiency of the light and the optical waveguide.

Abstract: A temperature demodulation method oriented toward a distributed fiber Raman temperature sensing system, the method comprising the following steps: step 1 of constructing a high-precision temperature detection device oriented towards a distributed fiber Raman sensing system; step 2 of performing signal processing with respect to Stokes light and anti-Stokes light at a calibration stage; step 3 of performing signal processing with respect to Stokes light and the anti-Stokes light at a measurement stage; and step 4 of obtaining a high-precision temperature demodulation technique oriented toward the distributed fiber Raman sensor. The method is used to effectively resolve the issue of low temperature measuring accuracy caused by Rayleigh crosstalk in existing distributed fiber Raman temperature measurement systems, and temperature measurement accuracy thereof is expected to fall within ±0.1° C. The method is applicable to distributed fiber Raman temperature measurement systems.

Abstract: A self-calibration detection device and a temperature demodulation method oriented to a fiber Raman temperature sensing system. The self-calibration detection device comprises a fiber Raman thermodetector, thermostatic baths, a multi-mode sensing fiber, and a multi-mode reflector. The fiber Raman thermodetector comprises a pulsed laser whose output end is connected to the input end of a WDM. Two output ends of the WDM are respectively connected to input ends of a first and second APDs. Output ends of the first and second APDs are respectively connected to input ends of a first and second LNAs. Output ends of the first and second LNAs are connected to the input end of a data acquisition card whose output end is connected with the input end of a computer. The temperature demodulation method can solve the problems of low temperature measuring accuracy, lower temperature measurement stability and low temperature measurement efficiency.

Abstract: A monolithic integrated semiconductor random laser comprising substrate, lower confinement layer on the substrate, active layer on the lower confinement layer, upper confinement layer on the active layer, strip-shaped waveguide layer longitudinally made in middle of the upper confinement layer, P+ electrode layer divided into two segments and made on the waveguide layer and N+ electrode layer on a back face of the lower confinement layer, wherein the two segments correspond respectively to gain region and random feedback region. The random feedback region uses a doped waveguide to randomly feedback light emitted by the gain region and then generates random laser which is random in frequency and intensity. Further, the semiconductor laser is light, small, stable in performance and strong in integration.

Abstract: An InP-based monolithic integrated chaotic semiconductor laser chip capable of feeding back randomly diffused light, being composed of six regions: a left DFB semiconductor laser, a bidirectional SOA, a left passive optical waveguide region, a doped passive optical waveguide region, a right passive optical waveguide region, and a right DFB semiconductor laser, specifically including: an N+ electrode layer, an N-type substrate, an InGaAsP lower confinement layer, an undoped InGaAsP multiple quantum well active region layer, doped particles, distributed feedback Bragg gratings, an InGaAsP upper confinement layer, a P-type heavily doped InP cover layer, a P-type heavily doped InGaAs contact layer, a P+ electrode layer, a light-emitting region, and isolation grooves. It effectively solves problems of bulky volume of the existing chaotic laser source, the time-delay signature of chaotic laser, narrow bandwidth, and low coupling efficiency of the light and the optical waveguide.

Abstract: With regard to a learning method for a smartwatch to prevent a metal hand from lightening the screen by unintended touch, a mainboard chip firstly finds and learns points which unintendedly touch the screen. Then, the mainboard chip reserves the time Tm which leads to unintended touch on the screen. The mainboard chip judges the present state: at the reserved time Tm, if the display screen is in an ON state, the display screen will keep the ON state. If the display screen is in an OFF state, the display screen will keep the OFF state.

Abstract: A monolithic integrated semiconductor random laser composed of a gain region and random feedback region, comprising: a substrate, a lower confinement layer on the substrate, an active layer on the lower confinement layer, an upper confinement layer on the active layer, a strip-shaped waveguide layer longitudinally made in middle of the upper confinement layer, a P+ electrode layer divided into two segments by an isolation groove and made on the waveguide layer, and an N+ electrode layer on a back face of the lower confinement layer. The two segments of the P+ electrode layer correspond respectively to the gain region and the random feedback region. The random feedback region uses a doped waveguide to randomly feed back light emitted and amplified by the gain region. As a result, random laser is emitted.

Abstract: With regard to a learning method for a smartwatch to prevent a metal hand from lightening the screen by unintended touch, a mainboard chip firstly finds and learns points which unintendedly touch the screen. Then, the mainboard chip reserves the time Tm which leads to unintended touch on the screen. The mainboard chip judges the present state: at the reserved time Tm, if the display screen is in an ON state, the display screen will keep the ON state. If the display screen is in an OFF state, the display screen will keep the OFF state.

Abstract: This invention provides a production method of a poly(carbonate-ether)polyol, comprising the steps of: performing a reaction between a carboxylic acid and an epoxide to obtain an intermediate, wherein the carboxylic acid has an acidity constant of 0.2 to 4; and performing a polymerization reaction between the intermediate and carbon dioxide under the action of a rare earth doped double metal cyanide of Zn3[Co(CN)6]2 to obtain a poly(carbonate-ether)polyol. In the production method of the poly(carbonate-ether)polyol provided by this invention, a carboxylic acid having a suitable acidity constant is used as an initiator and an epoxide is firstly activated by using the carboxylic acid, and polyethers having different molecular weights generated in situ after activation are used as chain transfer agents to be involved in the polymerization reaction between carbon dioxide and the epoxide under the action of a rare earth doped double metal cyanide Zn3[Co(CN)6]2.

Abstract: This invention provides a production method of a poly(carbonate-ether)polyol, comprising the steps of: performing a reaction between a carboxylic acid and an epoxide to obtain an intermediate, wherein the carboxylic acid has an acidity constant of 0.2 to 4; and performing a polymerization reaction between the intermediate and carbon dioxide under the action of a rare earth doped double metal cyanide of Zn3[Co(CN)6]2 to obtain a poly(carbonate-ether)polyol. In the production method of the poly(carbonate-ether)polyol provided by this invention, a carboxylic acid having a suitable acidity constant is used as an initiator and an epoxide is firstly activated by using the carboxylic acid, and polyethers having different molecular weights generated in situ after activation are used as chain transfer agents to be involved in the polymerization reaction between carbon dioxide and the epoxide under the action of a rare earth doped double metal cyanide Zn3[Co(CN)6]2.

Abstract: A device for monitoring and preventing slump and a processing method thereof is disclosed. The device includes: an alarm module, a signal collection module, and a signal processing module, wherein the signal collection module is used for collecting human-body posture behavior data and biometrics data; the signal processing module includes a slump detection unit configured to perform analysis processing according to the human-body posture behavior data and biometrics data to judge a state of the human body, and output a help signal to the alarm module when judging that a slump occurs to the human body; and the alarm module generates and outputs help message according to the help signal. The device and method perform slump detection through the human-body posture behavior data and biometrics data, thus the behavior characteristics of the human body are considered effectively, and higher accuracy is achieved.

Abstract: A method and an apparatus for detecting a magnetic signal of paper money. By using detecting a magnetic track and repairing an abnormal magnetic track, the detection method solves the phenomenon of the abnormal magnetic track, and greatly improves the recognition accuracy rate and the receiving rate of a paper money recognition apparatus. The detection method comprises: S1: acquiring original data of a paper money magnetic signal; S2: performing abnormal magnetic track detection on the original data to obtain a detection result; S3: if the detection result is an abnormal magnetic track, performing step S4 and step S5, otherwise, performing step S6; S4: repairing the original data according to a preset repair rule to obtain repaired data; S5: comparing the repaired data with a preset standard value to obtain a recognition result; and S6: comparing the original data with the preset standard value to obtain a recognition result.

Abstract: The invention relates to a polymeric end-capping reagent for carbon dioxide-epoxide copolymers and a method for producing the same. The polymeric end-capping reagents provided by the invention are maleic anhydride copolymers and maleic anhydride terpolymers. The polymeric end-capping reagent for carbon dioxide-propylene oxide copolymers of the invention is produced by a radical solution copolymerization method, and has a number average molecular weight of Mn=4-6×104, a distribution index of 1.5-3.0. By using the polymeric end-capping reagent provided by the invention, the disadvantages of the small molecular end-capping reagent like volatilization during melting and precipitation on the melt surface during cooling, can be effectively overcome, moreover, the initial thermal decomposition temperatures of the carbon dioxide-propylene oxide copolymers end-capped with the polymeric end-capping reagents increase by about 30° C.