Jingtao Liang

Northeast Institute of Geography and Agroecology, Beijing, Beijing Shi, China

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Publications (13)11.29 Total impact

  • Jianguo Li, Tao Yan, Jingtao Liang, Jinghui Cai
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    ABSTRACT: In this paper, output characteristics of a laser diode end-pumped Tm:YAG laser in a wide temperature range were investigated. In this laser system, a Tm:YAG crystal was cooled in a cryostat with liquid helium or liquid nitrogen as coolant. At the temperature of 88 K, a maximum output power of 4.68 W is achieved when the incident pump power is 8.9 W, and the optical–optical conversion efficiency is 52.6%, with a slope efficiency of 56.1%. The dependence of the output characteristics of Tm:YAG on temperature was experimentally studied in the temperature range of 25–300 K.
    Optics Communications 01/2015; 334:118–121. · 1.44 Impact Factor
  • Houlei Chen, Nana Xu, Jingtao Liang, Luwei Yang
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    ABSTRACT: The development of pulse tube coolers has progressed significantly during the past two decades. A single piston linear compressor is used to in order to reduce the size and mass of a high frequency pulse tube cryocooler. The pulse tube achieved a no-load temperature of 61 K and a cooling power of 1 W@80 K with an operating frequency of 80 Hz and an electrical input power of 50 W. By itself, the single piston compressor generates a large vibration, so a set of leaf springs with an additional mass is used to reduce the vibration. The equation relating the mass, the elasticity coefficient of leaf spring and the working frequency is obtained through an empirical fit of the experimental data. The vibration amplitude is reduced from 55 mm/s to lower than 5 mm/s by using a proper leaf spring. This paper demonstrates that a single piston compressor with vibration reduction provides a good choice for a PTC.
    Cryogenics 12/2012; 52(12):816–818. · 1.17 Impact Factor
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    ABSTRACT: Miniature pulse tube coolers operating at 100Hz have been designed and manufactured. The regenerator is designed by REGEN 3.2, and the inertance tube is simulated by DeltaE. An in-line prototype is manufactured according to the theoretical design parameters initially. On that basis, a coaxial cooler is developed and with double inlet it gains higher cooling performance.
    06/2012;
  • Source
    BaoJun Luo, GuoTong Hong, JingTao Liang
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    ABSTRACT: The shock compression experiment of liquid helium is an available way to gain properties of specimen at high temperatures and pressures. Based on Fluent, a thermal insulation analysis and design of a liquid helium temperature target in the environment condition of 100 Pa for shock compression experiment is performed. Then, a cryogenic target with a 10 K helium vapor shield and a separated vacuum interval is particularly developed. A lowest temperature of 3.63 K and a stable temperature of 3.70 K in the specimen cavity with an accuracy of 0.1 K are obtained by means of continuous flow and vacuum cooling. Both time-consuming and temperature stability are well-suited to the requirements of the shock compression experiment. The results show that the calculated and experimental data well-matched each other. The simulation method may be effective and feasible for the optimal design of the cryogenic target. Keywordsnumerical computation–cryogenic target–helium vapor shield–helium liquefaction–shock compression
    Chinese Science Bulletin 01/2011; 56(3):349-353. · 1.37 Impact Factor
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    ABSTRACT: To investigate the oscillating gas flow along an inertance tube used in pulse tube coolers, a CFD model is set up for FLUENT and an experimental measuring cell is designed and optimized by CFD results. Some characteristics of oscillating flow are demonstrated and discussed. Then, the flow status along an inertance tube is measured by the optimized measuring cell. The experimental results validate the simulating results.
    04/2010;
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    ABSTRACT: A demonstration sub-system for mobile communications was developed. In this system, a high-temperature superconducting (HTS) microstrip bandpass filter on r-plane sapphire substrate was designed to have a quasi-elliptic function response, which was aimed at covering the whole receive band of DCS 1800 base station, i.e. 1710–1785 MHz. This filter was then integrated with a low noise amplifier (LNA) and a pulse tube cryocooler, forming a demonstration sub-system. Satisfactory performance of this system was achieved.
    Superconductor Science and Technology 01/2002; 15(2):276. · 2.76 Impact Factor
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    ABSTRACT: The first HTS front-end subsystem for wireless base station in China was developed. This demonstration system, which aims at the application in GSM 1800 mobile communication base station, consists of a single RF path, i.e. one filter and one LNA, integrated with the pulse tube cooler. The subsystem works at a pass band of 1710–1785 MHz with a gain of 18 dB and at a temperature of 70 K. The accomplishment of such a demonstration subsystem can boost the development of HTS commercial subsystem.
    Science in China Series E Technological Sciences 01/2002; 45(6):638-645. · 1.02 Impact Factor
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    ABSTRACT: In this paper, an effort is made to utilize mixed-gases as refrigerant in the open cycle Joule-Thomson (J-T) cryocooler used for cooling infrared devices. The theoretical analysis of the thermodynamic performance of the mixed-refrigerant J- T cryocooler is made, including the refrigeration temperature, the cooling capacity, and the cool-down period. The principle of the component selection of the mixture is presented. A simple theoretical estimation model is developed to calculate the cool-down period of the J-T cryocooler. An experimental setup is also established to test the thermodynamic performance of a miniature open cycle J-T cryocooler. The refrigeration performances of the cryocooler using pure nitrogen and mixture are compared theoretically and experimentally. Both the theoretical and experimental results show that using appropriate gas mixture can improve the thermodynamic performance of the open cycle J-T cryocooler used for cooling infrared devices.
    Proc SPIE 12/2000;
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    ABSTRACT: For the purpose of cooling space-borne infrared detectors, a high frequency miniature pulse tube refrigerator (PTR) has been developed in our laboratory. The 1.06cc linear compressor made by our laboratory is used to generate the pressure waves. In order to be conveniently used, the pulse tube refrigerator has adopted the multi-bypass, co-axial and symmetry spray nozzle phase shifter structure. The cold finger of the refrigerator is only 72mm long with outer diameter 9mm. This paper also presents the recently experimental result. When the hot end of the refrigerator, cooled by air, is kept at 293K, and the input power of the motor is 30.5W, the minimum temperature of the refrigerator is 70.5K and the cooling power is 185mW at 80K and 280mW at 85K. If the hot end is cooled to 281K by water, the minimum temperature can be 61K and the cooling power is 350mW at 80K. Up to now, the life test of the cooler has been lasting for more than 1100 hours. In the experiment, the room temperature is kept at 300+/- 2K, the humidity is about 60%, and the minimum cold end temperature is generally within the range of 75.4+/- 0.5K, the total apparent cooler power consumption varied between 31.4W and 31.8W.
    Proc SPIE 12/2000;
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    ABSTRACT: Two new types of pulse tube refrigerators with optimized cooling power of 6 W at 77 K have been designed and fabricated. Experiments show that vibration of the pulse tube refrigerators is at least an order of magnitude smaller than that of Stirling coolers. Two microwave devices, a HTS cavity and a HTS miniature lumped band-stop filter, were integrated with the refrigerators and operated successfully, which demonstrated the potential application of these integrated devices and the refrigerator as practical HTS sub-systems
    IEEE Transactions on Applied Superconductivity 07/1999; · 1.20 Impact Factor
  • Luwei Yang, Yuan Zhou, Jingtao Liang
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    ABSTRACT: This paper analyzes direct current flow (DC flow) due to double-inlet, and introduces a second orifice version pulse tube refrigerator experiment to diminish DC flow. Analysis based on some assumptions shows that DC flow through the double-inlet valve in the pulse tube refrigerator is not generally zero, and the DC flow direction may change when the pressure wave changes. Thus, different schemes should be developed for different DC flow directions. In experiments, through measuring the change of temperature near the hot end of the pulse tube, DC flow direction different from former in pulse tube is decided. The second orifice is arranged from the second-stage reservoir to high pressure of the compressor, instead of the traditional arrangement of from the reservoir to low pressure. Experiments with the newly arranged second orifice show that the lowest temperature is about 4 K lower than without the second orifice.
    Cryogenics 01/1999; 39(3):187-192. · 1.17 Impact Factor
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    ABSTRACT: The pulse tube refrigerator is a competitive new technology for cooling HTS microwave devices because it involves no moving parts at low temperature. A 1.6 W/77 K multi-stage U-shape pulse tube refrigerator driven by a valveless compressor was designed and fabricated. Another coaxial pulse tube refrigerator driven by an air conditioning compressor, with a minimum temperature of 38.4 K and 6 W of cooling power at 77 K, was also developed. Experiments show that vibration of the pulse tube cooler is an order of magnitude smaller than that of Stirling machine. Two HTS microwave devices were integrated with this cooler and operated successfully
    01/1998;
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    ABSTRACT: The concept of a new type of pulse tube refrigerator, termed pulse tube refrigerator with low temperature switching valve, is proposed. It is suitable for industrial applications that require larger refrigeration powers. In this kind of pulse tube refrigerator a recuperative heat exchanger instead of a regenerator is used and a switching valve is installed at the cold end of an orifice pulse tube. The adiabatic expansion efficiency of the orifice pulse tube with low temperature switching valve, which actually works as a new type of expander, has been experimentally investigated. Adiabatic efficiencies higher than 40% have been achieved in the preliminary experiments. Methods for increasing the adiabatic efficiency are discussed.
    Cryogenics 01/1997; · 1.17 Impact Factor

Publication Stats

7 Citations
11.29 Total Impact Points

Institutions

  • 2011
    • Northeast Institute of Geography and Agroecology
      • Graduate School
      Beijing, Beijing Shi, China
  • 1997–2011
    • Chinese Academy of Sciences
      • • Technical Institute of Physics and Chemistry
      • • Institute of Physics
      Beijing, Beijing Shi, China