Non-magnetic heating temperature control system

[0018] The present invention will be further described below in conjunction with the drawings.

[0019] A non-magnetic heating temperature control system includes a laser 1, a 1×4 optical splitter 3, an atomic heating chamber 6 and a temperature controller 8. Laser 1 is a semiconductor laser with a wavelength of 850nm, a maximum optical power of 3W, and a pigtail 2 output, with a maximum output optical power of 2W. The main beam laser from laser 1 enters 1×4 optical splitter 3 through pigtail 2. The splitting ratio of 1×4 optical splitter 3 is 25:25:25:25, that is, four beams in pigtail 4 The beam laser light power is equal. The pigtail 4 passes through the insulation layer 5 and the atomic heating chamber 6, and is fixed at the middle position of the side wall of the atomic heating chamber 6. The four pigtails are adjacent to each other at 90° and surround the atomic gas chamber 10 for heating, ensuring the minimum temperature gradient in the effective working area . The atomic heating chamber 6 is a cylindrical axial hollow and transparent structure, with an outer diameter of 56mm, an inner diameter of 36mm, and a length of 50mm, made of non-magnetic material silicon carbide. The atomic heating chamber 6 is placed at the center of the thermal insulation layer 5. The thermal insulation layer 5 is a rectangular parallelepiped axially hollow and transparent structure made of polystyrene foam with low thermal conductivity. The atomic gas chamber 10 is a cylinder and is placed in the center of the atomic heating chamber 6. The central points of the thermal insulation layer 5, the atomic heating chamber 6 and the atomic gas chamber 10 are all located on the same straight line. A non-magnetic platinum resistance 11 is used as a non-magnetic temperature sensor in the atomic heating chamber 6 and is placed directly below the atomic gas chamber 10. The non-magnetic platinum resistor 11 is welded by high temperature spot welding, and the maximum remanence is better than 5pT. The temperature controller 8 receives the temperature collected by the non-magnetic platinum resistor 11 through the wire 7, and uses the neural network artificial intelligence PID to adjust the output power of the laser 1 through the single-core shielded signal line 9, so as to achieve the purpose of controlling the temperature of the atomic gas chamber 10. The temperature control accuracy reaches 0.5℃.

[0020] Such as figure 1 Shown, non-magnetic heating temperature control system. Including laser 1, 1×4 optical splitter 3, atomic heating chamber 6 and temperature controller 8. Laser 1 is a semiconductor laser with a wavelength of 850nm, a maximum optical power of 3W, and a pigtail 2 output, with a maximum output optical power of 2W. The main beam laser from laser 1 enters 1×4 optical splitter 3 through pigtail 2. The splitting ratio of 1×4 optical splitter 3 is 25:25:25:25, that is, four beams in pigtail 4 The beam laser light power is equal. The pigtail 4 passes through the insulation layer 5 and the atomic heating chamber 6, and is fixed at the middle position of the side wall of the atomic heating chamber 6. The four pigtails are adjacent to each other at 90° and surround the atomic gas chamber 10 for heating, ensuring the minimum temperature gradient in the effective working area . A non-magnetic platinum resistance 11 is used as a non-magnetic temperature sensor in the atomic heating chamber 6, which is placed directly under the atomic gas chamber 10 to collect the temperature of the atomic gas chamber 10 in real time. The temperature controller 8 receives the temperature collected by the non-magnetic platinum resistor 11 through the wire 7, and uses the neural network artificial intelligence PID to adjust the output power of the laser 1 through the single-core shielded signal line 9, so as to achieve the purpose of controlling the temperature of the atomic gas chamber 10. The temperature control accuracy reaches 0.5℃. At this time, a closed-loop temperature control system is formed.

[0021] Since the atomic gas chamber 10 needs to work in a non-magnetic environment, the atomic heating chamber 6 is made of non-magnetic material silicon carbide, and the maximum remanence is better than 5pT. This material has the characteristics of high temperature resistance, good thermal conductivity, corrosion resistance, etc., but also has a certain mechanical strength and is easier to process. The atomic heating chamber 6 is a cylindrical axial hollow and transparent structure with an outer diameter of 56 mm, an inner diameter of 36 mm, and a length of 50 mm. The atomic gas chamber 10 is a cylinder, and is placed in the center of the atomic heating chamber 6. Finally, in order to achieve better insulation performance, an insulation layer 5 is added to the outer layer of the atomic heating chamber 6. The thermal insulation layer 5 is a rectangular parallelepiped axially hollow and transparent structure, and is made of polystyrene foam with low thermal conductivity, ensuring that the internal temperature of the atomic heating chamber 6 has good uniformity. The central points of the thermal insulation layer 5, the atomic heating chamber 6 and the atomic gas chamber 10 are all located on the same straight line.

[0022] In order to monitor the temperature of the atomic gas chamber 10 without introducing magnetic noise, a three-wire non-magnetic platinum resistance 11 is used as a non-magnetic temperature sensor. The probe of the non-magnetic platinum resistance 11 is made of pure platinum, the wire is pure copper, and both are non-ferromagnetic materials. Welding by means of high temperature spot welding minimizes the remanence of the sensor. In actual application, the non-magnetic platinum resistor 11 transmits the current real-time temperature of the atomic gas chamber 10 as a feedback signal to the temperature controller 8 to display and adjust the output power of the laser 1.