Accurate temperature control system of blackbody radiation source

Abstract

The utility model provides an accurate temperature control system of a blackbody radiation source, and belongs to the technical field of temperature measurement and calibration. Comprising a blackbody radiation source assembly and a temperature control assembly. The blackbody radiation source assembly comprises a heat preservation box and a blackbody heating furnace, the blackbody heating furnace is cylindrical, an annular groove is formed in the outer side wall of the blackbody heating furnace in the circumferential direction, the blackbody heating furnace is fixedly installed in the heat preservation box, and the box is filled with heat preservation materials. The temperature control assembly comprises a temperature controller and a heating wire, and the heating wire is evenly wound in the multiple annular grooves and connected with the temperature controller. By adopting the precise temperature control system of the blackbody radiation source, the technical problems of poor temperature uniformity and poor temperature control precision caused by heating and temperature control structure defects in the existing blackbody radiation source in the prior art can be solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to temperature measurement and calibration technical field, especially related to a precise temperature control system of blackbody radiation source. BACKGROUND

[0002] Blackbody radiation source is the key equipment in temperature measurement and infrared probe calibration, and electric heating type blackbody is widely used in the measurement and test of infrared detector, infrared imaging system and infrared guided missile system, and the calibration of infrared instrument equipment, therefore, temperature stability is the most important key technical index.

[0003] In the related art, in order to improve the temperature uniformity inside the blackbody radiation source, the method of arranging silicon-carbon rods, silicon-molybdenum rods and other heating rods near the blackbody furnace for heating and temperature control is usually adopted.

[0004] In the related art, after a long time of use, the power of different heating areas in the extension direction may change due to the aging of the heater and the heating rod, and the heating conduction performance may also deteriorate. SUMMARY

[0005] The utility model discloses a precise temperature control system of blackbody radiation source can solve the technical problem of temperature uniformity and poor temperature control precision caused by the defects of heating and temperature control structure in the existing blackbody radiation source in the related art.

[0006] The utility model discloses a precise temperature control system of blackbody radiation source, including blackbody radiation source subassembly and temperature control subassembly,

[0007] The blackbody radiation source subassembly includes the heat preservation box and blackbody heating furnace, and the blackbody heating furnace is cylindrical, and the outer side wall is provided with annular grooves along the circumference.

[0008] The temperature control subassembly includes temperature controller and heating wire, and the heating wire is uniformly wound in a plurality of annular grooves and connected with the temperature controller.

[0009] Optionally, a circular through hole is arranged on the side plate of the heat preservation box, a plurality of first bolt holes are arranged at the edge of the circular through hole and are equiangularly spaced in the axial direction, a clamping flange is protrusively arranged on one end face of the blackbody heating furnace in the axial direction, the clamping flange is embeddedly installed in the circular through hole, and a plurality of second bolt holes corresponding to the plurality of first bolt holes are arranged on the end face around the clamping flange.

[0010] Optionally, the heat preservation box comprises a first side plate, a second side plate and a plurality of third side plates, the first side plate and the second side plate are arranged in parallel and are spaced apart, the circular through hole and the first bolt hole are arranged on the first side plate, a plurality of the side plates are arranged around the first side plate and the second side plate to form the heat preservation box, and at least one of the third side plates is provided with a lead hole through which the heating wire is led out.

[0011] Optionally, a probe hole is radially arranged on the other end side wall of the blackbody heating furnace away from the clamping flange in the axial direction.

[0012] Optionally, a plurality of probe holes are equiangularly spaced.

[0013] Optionally, an installation lug is arranged on at least one side edge of the first side plate, and an installation hole is arranged on the installation lug.

[0014] Optionally, the width of the annular groove ranges from 2.5 to 3 mm, the depth of the annular groove ranges from 2.5 to 2.65 mm, and the spacing between adjacent two annular grooves ranges from 0.7 to 0.9 mm.

[0015] Optionally, the heating wire is a nichrome wire.

[0016] Optionally, a ceramic tube is externally sleeved on the heating wire.

[0017] Optionally, the heat preservation material is asbestos.

[0018] The technical scheme provided by the embodiment of the utility model has at least the following beneficial effects:

[0019] The precise temperature control system of the blackbody radiation source has the following advantages: after the equipment is powered on by using an external power supply, a test personnel starts a temperature controller through an external switch, and heats the blackbody heating furnace in the heat preservation box to a required temperature through a heating wire. The outer surface of the blackbody heating furnace is processed in a special shape, the annular grooves distributed on the outer surface are used for winding and arranging the heating wire, the temperature of the uniformly wound heating wire is transmitted to the blackbody heating furnace, the final temperature of the blackbody heating furnace is reacted on the inner wall of the furnace port coated with a radiation material, the temperature of the blackbody can be captured through an infrared imaging device on one side of the circular through hole at this time, and the purpose of measurement and calibration is achieved.

[0020] The scheme utilizes heat conduction and heat radiation theory, optimizes the layout and power distribution of the heating element, and realizes stable temperature rise and temperature control through the temperature controller cooperating with the uniformly wound heating wire, ensures the heating temperature uniformity of each position on the outer surface of the blackbody heating furnace, finally realizes the uniform heating of the inner wall of the furnace mouth, and achieves the effect of stable temperature control. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical scheme in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0022] Figure 1 is a structural schematic diagram of the precise temperature control system of the blackbody radiation source provided by the embodiments of the present application;

[0023] Figure 2 is a structural explosion schematic diagram of the blackbody radiation source assembly provided by the embodiments of the present application;

[0024] Figure 3 is a structural sectional view of the blackbody radiation source assembly provided by the embodiments of the present application;

[0025] Figure 4 is a partial structural sectional view of the surface of the blackbody heating furnace provided by the embodiments of the present application;

[0026] Figure 5 is an electrical connection diagram of the precise temperature control system of the blackbody radiation source in the embodiments of the present application.

[0027] In the figure: 1-blackbody radiation source assembly; 2-temperature control assembly; 11-heat preservation box; 11a-circular through hole; 11b-first bolt hole; 12-blackbody heating furnace; 21-temperature controller; 22-heating wire; 111-first side plate; 112-second side plate; 113-third side plate; 121-annular groove; 122-clamping flange; 123-second bolt hole; 124-probe hole; 221-ceramic tube; 1111-mounting lug; 1112-mounting hole; 1131-lead hole; 1241-temperature probe. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the present application more clear, the embodiments of the present application will be further described in detail below with reference to the drawings.

[0029] Figure 1 is a structural schematic view of the precise temperature control system of the blackbody radiation source provided in the embodiments of the present application; Figure 2 is a structural explosion schematic view of the blackbody radiation source assembly provided in the embodiments of the present application;

[0030] Figure 3 is a structural sectional view of the blackbody radiation source assembly provided in the embodiments of the present application; Figure 4 is a local structural sectional view of the surface of the blackbody heating furnace provided in the embodiments of the present application; Figure 5 is an electrical connection diagram of the precise temperature control system of the blackbody radiation source in the embodiments of the present application. As shown in Figures 1 to 5 the embodiments of the present application provide a precise temperature control system of a blackbody radiation source, which comprises a blackbody radiation source assembly 1 and a temperature control assembly 2.

[0031] The blackbody radiation source assembly 1 comprises an insulation box 11 and a blackbody heating furnace 12. The blackbody heating furnace 12 is in a cylindrical shape, and an annular groove 121 is arranged on the outer side wall of the blackbody heating furnace 12 in a circumferential direction. The annular groove 121 is arranged in multiple and uniformly spaced along the axial direction of the blackbody heating furnace 12. The blackbody heating furnace 12 is fixedly installed in the insulation box 11, and the insulation box 11 is filled with an insulation material. Exemplarily, in the embodiments of the present application, the insulation material is high-temperature-resistant asbestos.

[0032] The temperature control assembly 2 comprises a temperature controller 21 and a heating wire 22. The heating wire 22 is uniformly wound in the multiple annular grooves 121 and connected with the temperature controller 21. Exemplarily, in the embodiments of the present application, the heating wire 22 is a nichrome wire wound with a ceramic tube 221. The nichrome alloy has excellent high-temperature stability, and the oxidation resistance and wear resistance of the nichrome alloy are good, and the service life is long. The ceramic tube 221 is wound on the nichrome wire, and then wound in the groove body of the annular groove 121. The ceramic tube 221 has excellent thermal conductivity, and at the same time, the heating wire 22 is wrapped and protected, and further contacts the outer surface of the blackbody heating furnace 12. The temperature controller 21 is a high-precision temperature controller, which adopts a PID control algorithm or a more advanced control strategy to realize high-precision temperature control. To solve the precision problem, the temperature control module needs to be further selected, and finally an imported PID temperature control module SR23 is selected. The temperature measurement accuracy of the module can reach 0.01℃, the temperature control accuracy can reach one thousandth level, and the temperature constant is mainly realized by the PID temperature control mode. The heating, constant temperature and other treatments inside the equipment are completely performed by the module.

[0033] In the embodiment of the utility model, the side plate of the heat preservation box 11 is provided with a circular through hole 11a for butt joint with the outlet of the external shell. The edge of the circular through hole 11a is arranged with a plurality of first bolt holes 11b at equal angles along the axial direction, and the blackbody heating furnace 12 is provided with a clamping flange 122 protruding from one end surface in the axial direction, during assembly, the clamping flange 122 of the blackbody heating furnace 12 is embedded in the circular through hole 11a to realize prepositioning, and a plurality of second bolt holes 123 arranged on the end surface around the clamping flange 122 are aligned with the circular through hole 11a on the side plate of the heat preservation box 11, and the fixed connection of the blackbody heating furnace 12 and the heat preservation box 11 can be completed by screwing bolts in sequence. Further, the heat preservation box 11 comprises a first side plate 111, a second side plate 112 and a plurality of third side plates 113, the first side plate 111 and the second side plate 112 are arranged in parallel and at intervals, the circular through hole 11a and the first bolt hole 11b are both arranged on the first side plate 111, the plurality of side plates are arranged between the first side plate 111 and the second side plate 112 to form the heat preservation box 11, and at least one third side plate 113 is provided with a lead hole 1131 for the heating wire 22 to pass out. After the winding of the heating wire 22 in the annular groove 121 is completed, the connection end of the heating wire 22 and the temperature controller 21 can be led out from the lead hole 1131 on the single or multiple third side plates 113 respectively, and connected with the temperature controller 21 located outside the heat preservation box 11. In the embodiment of the utility model, the lead hole 1131 can be correspondingly arranged on the plurality of third side plates 113 for common use or reservation, further facilitating assembly.

[0034] The precise temperature control system of the blackbody radiation source provided by the embodiment of the utility model is powered on by an external power supply, a tester starts the temperature controller 21 through an external switch, and the blackbody heating furnace 12 in the heat preservation box 11 is heated to the required temperature by the heating wire 22. The outer surface of the blackbody heating furnace 12 is treated in a special shape, the heating wire 22 is arranged by winding around the annular groove 121 distributed thereon, the temperature of the uniformly wound heating wire 22 is transmitted to the blackbody heating furnace 12, the final temperature of the blackbody heating furnace 12 is reacted on the inner wall of the furnace mouth coated with the radiation material, at this time, the temperature of the blackbody can be captured by using an infrared imaging device from one side of the circular through hole 11a, thereby achieving the purpose of measurement and calibration. The scheme utilizes the theory of heat conduction and heat radiation, optimizes the layout and power distribution of the heating element, and realizes stable temperature rise and temperature control through the temperature controller 21 cooperating with the uniformly wound heating wire 22, so as to ensure that the heating temperature of each position on the outer surface of the blackbody heating furnace 12 is uniform, and finally realize uniform heating of the inner wall of the furnace mouth, thereby achieving the effect of stable temperature control. The technical problem of poor temperature uniformity and temperature control precision caused by defects of the heating and temperature control structure in the existing blackbody radiation source in the related art is effectively solved.

[0035] Exemplarily, in the embodiment of the utility model, after winding the heating wire 22 in the annular groove 121 on the outer surface of the blackbody heating furnace 12, a layer of heat-conducting glue is coated in the remaining space of the annular groove 121, so as to reduce the heat loss of the heating wire 22 from the outside and increase the heat exchange area between the outer surface of the blackbody heating furnace 12, thereby further improving the heating uniformity.

[0036] Further, the probe hole 124 can be radially formed on the other end side wall of the blackbody heating furnace 12 axially away from the clamping flange 122, a temperature probe 1241, for example, a thermocouple structure formed by a platinum resistance, can be inserted into the probe hole 124, and connected with the temperature controller 21 through a lead wire, so as to detect and compare the temperature inside the heating end by PID, thereby realizing accurate temperature control. The probe hole 124 can also be injected with heat-conducting glue, so that the temperature probe fully contacts the heat, thereby accurately detecting the temperature.

[0037] Further, in the embodiment of the utility model, the probe hole 124 is circumferentially and equiangularly arranged around the outer side wall of the blackbody heating furnace 12, and four temperature probes 1241 are correspondingly inserted as temperature sensors, which are inserted into the furnace at a position of 1 / 2, the inner wall is filled with heat-conducting glue, and then the temperature inside the furnace is measured and read, the average value of four groups of data is obtained, and the temperature controller 21 is returned, and after PID processing, the temperature control purpose is achieved. Compared with a single sensor, four sensors can reduce errors and improve data acquisition accuracy.

[0038] Exemplarily, in the embodiment of the utility model, the furnace mouth of the blackbody heating furnace 12 is machined from aluminum alloy and treated by surface anodic oxidation black surface treatment. The box body of the heat preservation box 11 is long by rivet joint of carbon steel plate sheet metal, and is filled with heat preservation cotton. After the blackbody heating furnace 12 is completed, blackbody radiation material is applied to the inner wall of the furnace mouth, the blackbody is formed, and the emissivity of the radiation material affects the blackbody temperature. The radiation material is sprayed by a rotary machine, so that it can be uniformly applied to the inner wall of the cavity, and the uniformity is consistent.

[0039] Optionally, the width of the annular groove 121 ranges from 2.5 to 3 mm, the depth of the annular groove 121 ranges from 2.5 to 2.65 mm, and the spacing between the two adjacent annular grooves 121 ranges from 0.7 to 0.9 mm. Exemplarily, in the embodiment of the utility model, the width of the annular groove 121 in the extension direction is selected as 2.7 mm, the depth of the recess from the outer side wall to the groove bottom is selected as 2.5 mm, and the spacing between the two adjacent annular grooves 121 is selected as 0.8 mm, which can adapt to most specifications of nickel-chromium alloy heating wires on the market, is simple to assemble, and has good universality.

[0040] Optionally, at least one side edge of the first side plate 111 is provided with a mounting lug 1111, and a mounting hole 1112 is formed in the mounting lug 1111. Illustratively, in the embodiment of the utility model, the mounting lug 1111 is arranged on the upper and lower side edges of the first side plate 111 which is on the front surface of the heat preservation box 11 and leads to one side of the blackbody heating furnace 12, and the mounting hole 1112 in the mounting lug 1111 is used to realize the butt joint installation with the external box body, so that the overall integrated setting of the temperature control system is facilitated, and the integrated performance is improved.

[0041] Unless otherwise defined, technical terms or scientific terms used herein shall have the ordinary meaning as understood by a person with ordinary skill in the art to which the utility model belongs. The "first", "second" and similar words used in the utility model patent application specification and claims do not represent any order, quantity or importance, but are only used to distinguish different components. Similarly, "one" or "a" and similar words do not represent a quantity limit, but represent the existence of at least one. "Including" or "containing" and similar words mean that the elements or objects appearing before "including" or "containing" cover the elements or objects listed after "including" or "containing" and their equivalents, and do not exclude other elements or objects. "Connected" or "connected" and similar words are not limited to physical or mechanical connection, but can include electrical connection, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to represent relative positional relationship, and when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0042] The above is only optional embodiments of the utility model, and does not limit the utility model, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An accurate temperature control system for a blackbody radiation source, characterized by, The utility model relates to a blackbody radiation source assembly (1) and temperature control assembly (2) comprising: The blackbody radiation source assembly (1) comprises an insulation box (11) and a blackbody heating furnace (12), the blackbody heating furnace (12) is cylindrical, an annular groove (121) is arranged on the outer side wall in the circumferential direction, a plurality of annular grooves (121) are uniformly arranged along the axial direction of the blackbody heating furnace (12), the blackbody heating furnace (12) is fixedly installed in the insulation box (11), and the insulation box (11) is filled with insulation material; The temperature control assembly (2) comprises a temperature controller (21) and a heating wire (22), the heating wire (22) is uniformly wound in a plurality of annular grooves (121) and connected with the temperature controller (21). A circular through hole (11a) is arranged on the side plate of the insulation box (11), a plurality of first bolt holes (11b) are arranged at the edge of the circular through hole (11a) at equal angles along the axial direction, a clamping flange (122) is protrudingly arranged on one end face of the blackbody heating furnace (12) in the axial direction, the clamping flange (122) is embeddedly installed in the circular through hole (11a), and a plurality of second bolt holes (123) corresponding to the plurality of first bolt holes (11b) are arranged on the end face around the clamping flange (122).

2. The precise temperature control system for a blackbody radiation source of claim 1, wherein, The insulation box (11) comprises a first side plate (111), a second side plate (112) and a plurality of third side plates (113), the first side plate (111) and the second side plate (112) are arranged in parallel at intervals, the circular through hole (11a) and the first bolt hole (11b) are arranged on the first side plate (111), a plurality of side plates are arranged between the first side plate (111) and the second side plate (112) to form the insulation box (11), and at least one third side plate (113) is provided with a lead hole (1131) for the heating wire (22) to pass out.

3. The precise temperature control system for a blackbody radiation source of claim 2, wherein, A probe hole (124) is radially arranged on the other end side wall of the blackbody heating furnace (12) away from the clamping flange (122) in the axial direction.

4. The precise temperature control system for a blackbody radiation source of claim 2, wherein, A plurality of probe holes (124) are arranged at equal angles.

5. The precise temperature control system for a blackbody radiation source of claim 4, wherein, An installation lug (1111) is arranged on at least one side edge of the first side plate (111), and an installation hole (1112) is arranged on the installation lug (1111).

6. The precise temperature control system for a blackbody radiation source of claim 3, wherein, The width of the annular groove (121) ranges from 2.5 to 3 mm, the depth of the annular groove (121) ranges from 2.5 to 2.65 mm, and the spacing between adjacent two annular grooves (121) ranges from 0.7 to 0.9 mm.

7. The precise temperature control system for a blackbody radiation source of claim 1, wherein, The heating wire (22) is a nichrome wire.

8. The precise temperature control system of a blackbody radiation source according to any one of claims 1 to 7, characterized in that A ceramic tube (221) is externally sleeved on the heating wire (22).

9. The precise temperature control system for a blackbody radiation source of claim 8, wherein, The insulation material is asbestos.

10. The precise temperature control system for a blackbody radiation source of any one of claims 1 to 7, wherein, ​

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