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Battlefield situational awareness is the core condition that determines the success or failure of the battlefield, and it is also an important application direction of photodetectors. The rapid development of AI technology in rece...
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Battlefield situational awareness is the core condition that determines the success or failure of the battlefield, and it is also an important application direction of photodetectors. The rapid development of AI technology in recent years is about to cause major changes in future wars. The new AI battlefield will also put forward new urgent needs for situational awareness. This article summarizes the current main modes of collaborative detection of battlefield situation awareness and its research status, including radar / infrared composite detection, multi-source data fusion of radar / infrared detection, cooperative target recognition, target tracking, etc. On this basis, combined with the current development trend of the intelligence level of the main battlefield equipment, we get the development needs of future intelligent battlefield situational awareness for new types of collaborative detection, including requirements for its style, angle, speed, and detection targets of distributed collaborative detection. Based on this, the key development directions and core issues to be solved for intelligent battlefield situational awareness in the future are proposed.
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This article summarizes the reports and researches on detection system of STSS published in domestic and foreign literature, summarizes the development process of STSS detection system from a single geostationary orbit to a combin...
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This article summarizes the reports and researches on detection system of STSS published in domestic and foreign literature, summarizes the development process of STSS detection system from a single geostationary orbit to a combined large elliptical orbit, then to the development process of the high-track network and the low-track network cooperate with each other. It also summarizes the development process of infrared detectors from single-band to multi-band, from line scan with less detection pixels to line scan with more detection pixels and large-area staring array The application scenarios, overall scheme, and overall parameters of the STSS detection system are sorted out, and the core technical indicators are analyzed for the overall parameters. From the perspective of the development process of the US early warning satellite system and the technical characteristics of the space-based infrared system, US early warning satellite technology is of great significance to research on US defense programs, equipment, and system capabilities.
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摘要 :
This article summarizes the reports and researches on detection system of STSS published in domestic and foreign literature, summarizes the development process of STSS detection system from a single geostationary orbit to a combin...
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This article summarizes the reports and researches on detection system of STSS published in domestic and foreign literature, summarizes the development process of STSS detection system from a single geostationary orbit to a combined large elliptical orbit, then to the development process of the high-track network and the low-track network cooperate with each other. It also summarizes the development process of infrared detectors from single-band to multi-band, from line scan with less detection pixels to line scan with more detection pixels and large-area staring array The application scenarios, overall scheme, and overall parameters of the STSS detection system are sorted out, and the core technical indicators are analyzed for the overall parameters. From the perspective of the development process of the US early warning satellite system and the technical characteristics of the space-based infrared system, US early warning satellite technology is of great significance to research on US defense programs, equipment, and system capabilities.
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The Quanzhou Municipal government in the E-government constructed has made considerable progress, but information resources between institutions in various departments and utilization are still relatively weak. Thus it has initiat...
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The Quanzhou Municipal government in the E-government constructed has made considerable progress, but information resources between institutions in various departments and utilization are still relatively weak. Thus it has initiated "the information isolated island" and repetitive construction phenomenon. This article proposed that the construction government public information data center, information on various departments for effective integration is optimized to achieve sharing of information resources and improve utilization of government resources, to promote the overall effectiveness of the informationization construction.
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Uncooled infrared detectors haves some advantages such as low cost, light weight, low power consumption, and superior reliability, compared with cryogenically cooled ones. Ferroelectric uncooled focal plane array(FPA) are being de...
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Uncooled infrared detectors haves some advantages such as low cost, light weight, low power consumption, and superior reliability, compared with cryogenically cooled ones. Ferroelectric uncooled focal plane array(FPA) are being developed for its AC response and its high reliability. As a key part of the ferroelectric assembly, the ROIC determines the performance of the assembly. A top-down design model for uncooled ferroelectric readout integrated circuit(ROIC) has been developed. Based on the optical, thermal and electrical properties of the ferroelectric detector, the RTIA readout integrated circuit is designed. The noise bandwidth of RTIA readout circuit has been developed and analyzed. A novel high gain amplifier, a high pass filter and a low pass filter circuits are designed on the ROIC. In order to improve the ferroelectric FPA package performance and decrease of package cost a temperature sensor is designed on the ROIC chip. At last the novel RTIA ROIC is implemented on 0.6um 2P3M CMOS silicon techniques. According to the experimental chip test results, the temporal root mean square(RMS)noise voltage is about 1.4mV, the sensitivity of the on chip temperature sensor is 0.6 mV/K. from -40℃ to 60℃, the linearity performance of the ROIC chip is better than 99%. Based on the 320×240 RTIA ROIC, a 320×240 infrared ferroelectric FPA is fabricated and tested. Test results shows that the 320×240 RTIA ROIC meets the demand of infrared ferroelectric FPA.
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摘要 :
Uncooled infrared detectors haves some advantages such as low cost, light weight, low power consumption, and superior reliability, compared with cryogenically cooled ones. Ferroelectric uncooled focal plane array(FPA) are being de...
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Uncooled infrared detectors haves some advantages such as low cost, light weight, low power consumption, and superior reliability, compared with cryogenically cooled ones. Ferroelectric uncooled focal plane array(FPA) are being developed for its AC response and its high reliability. As a key part of the ferroelectric assembly, the ROIC determines the performance of the assembly. A top-down design model for uncooled ferroelectric readout integrated circuit(ROIC) has been developed. Based on the optical, thermal and electrical properties of the ferroelectric detector, the RTIA readout integrated circuit is designed. The noise bandwidth of RTIA readout circuit has been developed and analyzed. A novel high gain amplifier, a high pass filter and a low pass filter circuits are designed on the ROIC. In order to improve the ferroelectric FPA package performance and decrease of package cost a temperature sensor is designed on the ROIC chip. At last the novel RTIA ROIC is implemented on 0.6μm 2P3M CMOS silicon techniques. According to the experimental chip test results, the temporal root mean square(RMS)noise voltage is about 1.4mV, the sensitivity of the on chip temperature sensor is 0.6 mV/K from -40℃ to 60℃, the linearity performance of the ROIC chip is better than 99%. Based on the 320x240 RTIA ROIC, a 320x240 infrared ferroelectric FPA is fabricated and tested. Test results shows that the 320x240 RTIA ROIC meets the demand of infrared ferroelectric FPA.
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摘要 :
Uncooled infrared detectors haves some advantages such as low cost, light weight, low power consumption, and superior reliability, compared with cryogenically cooled ones. Ferroelectric uncooled focal plane array(FPA) are being de...
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Uncooled infrared detectors haves some advantages such as low cost, light weight, low power consumption, and superior reliability, compared with cryogenically cooled ones. Ferroelectric uncooled focal plane array(FPA) are being developed for its AC response and its high reliability. As a key part of the ferroelectric assembly, the ROIC determines the performance of the assembly. A top-down design model for uncooled ferroelectric readout integrated circuit(ROIC) has been developed. Based on the optical, thermal and electrical properties of the ferroelectric detector, the RTIA readout integrated circuit is designed. The noise bandwidth of RTIA readout circuit has been developed and analyzed. A novel high gain amplifier, a high pass filter and a low pass filter circuits are designed on the ROIC. In order to improve the ferroelectric FPA package performance and decrease of package cost a temperature sensor is designed on the ROIC chip. At last the novel RTIA ROIC is implemented on 0.6μm 2P3M CMOS silicon techniques. According to the experimental chip test results, the temporal root mean square(RMS)noise voltage is about 1.4mV, the sensitivity of the on chip temperature sensor is 0.6 mV/K from -40℃ to 60℃, the linearity performance of the ROIC chip is better than 99%. Based on the 320x240 RTIA ROIC, a 320x240 infrared ferroelectric FPA is fabricated and tested. Test results shows that the 320x240 RTIA ROIC meets the demand of infrared ferroelectric FPA.
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After adding different Cr, Mo, B, Re element, the new type of high manganese cast steel was prepared by using of vacuum induction furnace. Microstructure and mechanical properties of as-cast and heat treated alloys and wear quanti...
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After adding different Cr, Mo, B, Re element, the new type of high manganese cast steel was prepared by using of vacuum induction furnace. Microstructure and mechanical properties of as-cast and heat treated alloys and wear quantity of material were investigated by optical microscope, Brinell hardness tester, multifunctional tensile tester and abrasive wear tester. Results showed that in the as cast microstructure many pearlite and carbide precipitate on the boundary of grains; after quenching the sample in water the pearlite is basically dissolved, but a little of carbide is still not dissovled. The hardness of all of the samples is more than 220 HB, impact toughness reaches or exceeds 140 J/ cm2, and ultimate tensile strength of some sample reaches 753 MPa. Compared with the alloy of England MMD teeth component, some samples have better wear resistance, especially the samples 2-3 and 4-6, their wear loss are 0.02 g. The mechanical properties of cast high manganese steel are better than those of alloy materials that are used to produce some parts of the roadheader and shearer. The high performance-to-price ratio of high manganese steel eatings provides wide space for development of heavy equipment.
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摘要 :
After adding different Cr, Mo, B, Re element, the new type of high manganese cast steel was prepared by using of vacuum induction furnace. Microstructure and mechanical properties of as-cast and heat treated alloys and wear quanti...
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After adding different Cr, Mo, B, Re element, the new type of high manganese cast steel was prepared by using of vacuum induction furnace. Microstructure and mechanical properties of as-cast and heat treated alloys and wear quantity of material were investigated by optical microscope, Brinell hardness tester, multifunctional tensile tester and abrasive wear tester. Results showed that in the as cast microstructure many pearlite and carbide precipitate on the boundary of grains; after quenching the sample in water the pearlite is basically dissolved, but a little of carbide is still not dissovled. The hardness of all of the samples is more than 220 HB, impact toughness reaches or exceeds 140 J/ cm2, and ultimate tensile strength of some sample reaches 753 MPa. Compared with the alloy of England MMD teeth component, some samples have better wear resistance, especially the samples 2-3 and 4-6, their wear loss are 0.02 g. The mechanical properties of cast high manganese steel are better than those of alloy materials that are used to produce some parts of the roadheader and shearer. The high performance-to-price ratio of high manganese steel eatings provides wide space for development of heavy equipment.
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Porous metals are applied in many more fields than other porous materials. Pores in porous metal parts manufactured by selective laser melting (SLM) should not be regarded as defects but favorable characters because they are the m...
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Porous metals are applied in many more fields than other porous materials. Pores in porous metal parts manufactured by selective laser melting (SLM) should not be regarded as defects but favorable characters because they are the main composition of porous metal parts. Therefore, fully densification is not the only target in forming metal parts via SLM. The formation mechanism of pores in SLM is studied mathematically in this article, and mathematical model is built to describe the formation mechanism. It is concluded that the shape of pores and the porosity of parts are the function of SLM processing parameters and the diameter of powder particles. Pores can be controlled and estimated by adjusting processing parameters and the nature of forming materials. Porous metal parts produced by SLM can be applied in many more fields owing that SLM technology is flexible to change the shape of these part and the nature of materials.
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