Liquid Nitrogen Cryostat - Optics
Working principle
The low-pressure refrigerant is introduced into the cryostat from the liquid inlet, and then introduced into the evaporator at the bottom of the cryostat through the capillary tube inside the cryostat. A heater and a temperature sensor are also installed on the evaporator of the cryostat. , the steam whose temperature is controlled by the temperature controller is sprayed into the sample chamber. After cooling the sample, the steam is discharged through the air outlet pipe into the atmosphere or into a gas recovery device. In the design of this type of cryostat, in order to facilitate customers to easily load samples, the sample can be loaded from the top of the cryostat through the sample rod. The bottom of the cryostat uses a compact design with a vacuum cover. has a smaller duty cycle and is more suitable for measurements in magnetic fields.
Features:
◆ Temperature range (65K~500K), (optional 700K), high efficiency and fast cooling speed;
◆ The sample is in the vacuum chamber, providing an ideal and stable experimental environment;
◆ The vacuum interlayer is equipped with low-temperature adsorbent, which can increase the vacuum holding time and extend the use time of liquid nitrogen;
◆ The temperature sensor uses PT100 platinum resistor with good stability and repeatability;
◆ Multiple options to meet different testing needs;
◆ It is convenient to add liquid nitrogen during use;
◆ The optical sample holder can be equipped with a pluggable sample card and easy-to-use and beautiful binding posts;
◆ Can be customized according to customer requirements;
◆ Comes with 8 measuring leads as standard, which can be expanded to 32;
◆ The window comes standard with 2 fused quartz windows, which can be expanded to 5, and the window material can be changed according to user requirements;
◆ Changing samples is quick and convenient, and can be completed within 5 minutes;
◆ The sample holder is available as liquid sample holder, dust sample holder, solid sample holder, and block sample holder.
Technical specifications
| Model | DXT9115-4W | DXT9115-4W-H | DXT9120-4W | DXT9120-4W-H | DXT9130-4W | DXT9130-4W-H |
| Temperature range | 65-325k | 65-500k | 65-325k | 65-500k | 65-325k | 65-500k |
| Cooling time | ≤25min | |||||
| Optical window | Four Φ15X1.5 | Four Φ20X1.5 | Four Φ30X1.5 | |||
| Test lead connector | Standard 8-core measurement lead connector, optional coaxial connector and microwave connector. | |||||
| Sample holder size | 15X25mm | 15X25mm | 20X30mm | 20X30mm | 30X40mm | 30X40mm |
| Thermometer | PT100 platinum resistance thermometer (both calibrated and uncalibrated, the default is uncalibrated) | |||||
| Temperature stability | ±0.01K depends on the DXTC-290 temperature controller | |||||
| Heater | 30W | 60W | 30W | 60W | 30W | 60W |
| Vacuum interface | Standard KF25 interface | |||||
| Sample environment | The sample is placed in a vacuum environment | |||||
| Vacuum degree | ≤1Pa is enough | |||||
| Liquid nitrogen maintenance time | 6h@80K; 5h@100K; 3h@200K | |||||
| Liquid nitrogen chamber volume | Standard 500ml (can be customized) | |||||
| Application scope | Spectral testing, photoelectric reaction, Raman, electroluminescence, photoluminescence, etc. | |||||
Sample holder options:
| Model | Specifications and Parameters | Material | Describe |
| DXT9115-4W | 15X25mm | OFHC | Standard optical sample holder, |
| DXT9115-4W-10LTH | 15X25mm | OFHC | Standard optical sample holder with Φ10mm hole in the middle |
| DXT9115-4W-H-10LTH | 15X25mm | OFHC | Standard optical sample holder with Φ10mm hole in the middle |
| DXT9120-4W | 20X30mm | OFHC | Standard optical sample holder, no hole in the middle |
| DXT9120-4W-15LTH | 20X30mm | OFHC | Standard optical sample holder with Φ15mm hole in the middle |
| DXT9120-4W-H-15LTH | 20X30mm | OFHC | Standard optical sample holder with Φ15mm hole in the middle |
| DXT9130-4W | 30X40mm | OFHC | Standard optical sample holder, no hole in the middle |
| DXT9130-4W-20LTH | 30X40mm | OFHC | Standard optical sample holder with Φ20mm hole in the middle |
| DXT9130-4W-H-20LTH | 30X40mm | OFHC | Standard optical sample holder with Φ20mm hole in the middle |
| DXPSC-10 | Φ10 | Quartz | Powder sample container with 10mm quartz window on one side |
Remark:
1: All standard optical cryostats are shipped from the factory with only one sample holder.
2: If the above standard sample holder cannot meet customer needs, it can be customized according to customer requirements.
3: In order to fix the optical performance sample, all optical cryostats are equipped with a pressing plate to hold the sample. The aperture of the pressing plate is consistent with the size of the light hole.
Cryostat Optical connector options:
| Electrical connector model | Specifications and Parameters | Describe |
| DXT91-8P ordinary glass sintering | 8pin | Add a quick-plug 8P ordinary electrical connector |
| DXT91-12P ordinary glass sintering | 12pin | Add a quick-plug 12P ordinary electrical connector |
| DXT91-SMA | 0-18GHz | With soft cable |
| 0-12.4GHz | Equipped with semi-rigid and semi-flexible cables | |
| DXT91-BNC | 0-4GHz | With ordinary coaxial cable |
| DXT91-TRX | triax connector | Add a quick-plug triaxial connector |
| DXT91-S | Stainless steel junction box | Add a stainless steel junction box |
| DXT91-PTEF | PTFE wiring cover | Add a PTFE plate wiring cover to the stainless steel junction box |
Remark:
1: When all cryostats leave the factory, they are equipped with two connectors. One is for the installation of temperature sensors and heaters, and the other is a connector prepared for other performance measurements. When more test lines are needed, you will need Add mounting holes or install one or more Breakout Boxes;
2: There is the DXT91-S option in the above table. The wiring board and the shell of this option are integrally connected to the ground. The other is the DXT91-PTEF option. This option uses PTFE board insulation in the shell and the installed connector. The electrical properties of the housing and connector are independent of each other. This issue should be paid attention to when selecting.
3: Pressure reduction accessory options. The standard cryostat itself does not come with special pressure reduction spare parts. When a low temperature of 65K is required, corresponding pressure reduction accessories need to be configured.
