Terahertz radiation power measuring device based on SiO2 and ferrite magnetic powder composite material

Abstract

The invention discloses a terahertz radiation power measuring device based on a SiO2 and ferrite magnetic powder composite material, which comprises a terahertz transmitting module, a parabolic mirror optical assembly, a terahertz receiving module, a terahertz radiation power measuring module and a ferrite magnetic powder composite material, wherein the parabolic mirror optical assembly is arranged on the back surface of the terahertz transmitting module; the terahertz receiving module comprises a self-made terahertz power meter and a standard terahertz power meter, the self-made terahertz power meter comprises a self-made power meter rear cover, and the left side of the inner wall of the self-made power meter rear cover is fixedly connected with a self-made power meter heat sink material rear cover; a self-made power meter heat sink material is movably installed on the right side of the self-made power meter heat sink material rear cover, and a self-made power meter semiconductor thermopile sensor is movably installed in the self-made power meter heat sink material. According to the invention, through the self-made terahertz power meter and the arrangement of the terahertz receiving module, the radiation power can be metered with high precision, the measurement uncertainty is reduced, and the application of the terahertz power measuring instrument is accelerated.

Description

Technical Field

[0001] The invention relates to the technical field of testing and measurement, and in particular to a terahertz radiation power measuring device based on a SiO2 and ferrite magnetic powder composite material. Background Art

[0002] Terahertz refers to electromagnetic waves with a frequency of 0.1-10THz, that is, a band range of 30μm-3mm. Its long-wave band corresponds to millimeter waves, and its short-wave band overlaps with the infrared band. This is the crossover frequency band of macroscopic electronics and microscopic photonics. Since terahertz waves are located in a special frequency band in the electromagnetic spectrum, the study of terahertz technology requires the use of photonics and electronics theories for analysis and processing. For a long time, stable terahertz radiation could not be generated in the laboratory, and there was a lack of effective detection methods for terahertz waves, resulting in slow application research of electromagnetic waves in the terahertz frequency band. Terahertz waves have not been fully developed and studied, which is called the "terahertz gap" in the electromagnetic spectrum. Since the 1980s, driven by the development of new technologies and new materials in the terahertz field, terahertz research has developed rapidly, and a wave of terahertz research has emerged worldwide. Terahertz combines the characteristics of electronics and photonics, and has important application value and huge application potential in many fields such as physics, chemistry, biology, medicine, materials, and astronomy.

[0003] Radiated power is one of the important basic parameters of terahertz waves. The accurate measurement and evaluation of its value is not only of great significance for studying the characteristics of terahertz waves, but also provides reliable metrological support for the development of terahertz radiation sources. In recent years, terahertz radiation power measurement has attracted great attention at home and abroad. Steiger and his colleagues from the Physical and Technical Research Institute (PTB) used NG1 glass as the absorption material. After the NG1 body absorption glass was plated with a gold reflective film on the surface, terahertz only exists in the body absorption material. The reflectance of NG1 glass in the terahertz band and the reflectance at the He-Ne laser wavelength were measured, and the power responsivity of the terahertz radiometer was traced back to the laser power measurement standard. The metrology agency conducted a comparison of terahertz power. The terahertz wave was emitted by a molecular gas laser pumped by a carbon dioxide laser. The comparison point frequencies were 2.52THz and 0.762THz, which provided basic support for the establishment of international standards for terahertz band power measurement. The Chinese patent proposes an electrical substitution and laser calibration technology for reproducing terahertz radiation power. This method can be used to reproduce the terahertz power standard of the Institute of Metrology Science, which helps trace the terahertz radiation power back to the SI.

[0004] However, terahertz power measurement still has limitations. High-frequency optics and low-frequency microwaves have standard radiation power measurement instruments, while terahertz wave power measurement has developed relatively slowly, and its power measurement instruments have not yet been widely used. Summary of the invention

[0005] In order to solve the problems raised in the above background technology, the purpose of the present invention is to provide a terahertz radiation power measurement device based on SiO2 and ferrite magnetic powder composite material, which has the advantage of improving the terahertz power measurement accuracy and solves the problem that the terahertz radiation power measurement device cannot improve the terahertz power measurement accuracy.

[0006] To achieve the above object, the present invention provides the following technical solution: a terahertz radiation power measurement device based on a SiO2 and ferrite magnetic powder composite material, comprising:

[0007] Terahertz transmitting module;

[0008] A parabolic mirror optical component, wherein the parabolic mirror optical component is arranged on the back of the terahertz emission module;

[0009] A terahertz receiving module, wherein the terahertz receiving module comprises a self-made terahertz power meter and a standard terahertz power meter, wherein the self-made terahertz power meter comprises a self-made power meter back cover, wherein the left side of the inner wall of the self-made power meter back cover is fixedly connected with a self-made power meter heat sink material back cover, the right side of the self-made power meter heat sink material back cover is movably installed with a self-made power meter heat sink material, a self-made power meter semiconductor thermopile sensor is movably installed inside the self-made power meter heat sink material, a self-made power meter absorption material is movably installed on the right side of the self-made power meter semiconductor thermopile sensor, a self-made power meter reflection cavity is movably installed on the right side of the self-made power meter absorption material, and a self-made power meter front cover is fixedly connected to the right side of the self-made power meter reflection cavity;

[0010] A bidirectional moving platform is arranged on the right side of the terahertz receiving module.

[0011] As a preferred embodiment of the present invention, the terahertz transmitting module comprises a lifting platform, a clamp is movably installed on the top of the lifting platform, and the terahertz transmitting module is movably installed inside the clamp.

[0012] As a preferred embodiment of the present invention, the parabolic mirror optical assembly includes a parabolic mirror bracket, the parabolic mirror bracket is arranged on the back side of the lifting platform, an off-axis parabolic mirror 1 is fixedly connected to the right side of the back side of the inner wall of the parabolic mirror bracket, an off-axis parabolic mirror 2 is arranged on the left side of the off-axis parabolic mirror 1, and the front side of the off-axis parabolic mirror 2 is fixedly connected to the front side of the parabolic mirror bracket.

[0013] As a preferred embodiment of the present invention, the bidirectional movable platform comprises a two-dimensional manual slide, the left side of the two-dimensional manual slide is movably connected to a connecting splint, and the left side of the connecting splint is movably connected to the right side of the terahertz receiving module.

[0014] As a preferred embodiment of the present invention, a data acquisition unit and a data processing and display unit are provided inside the terahertz receiving module, and an output end of the data acquisition unit is electrically connected to an input end of the data processing and display unit.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The present invention makes a terahertz power meter by itself and sets a terahertz receiving module, which can measure the radiation power with high precision, reduce the measurement uncertainty, and accelerate the application of terahertz power measurement instruments.

[0017] 2. The present invention can emit a single-frequency terahertz source by setting a terahertz emission module. The user drives the clamp 102 to move up and down through the lifting platform 101, and the clamp 102 drives the terahertz emission module 103 to move up and down, adjusts the height of the terahertz emission module 103, and emits a single-frequency terahertz source through the terahertz emission module 103. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural diagram of the present invention;

[0019] Figure 2 For the present invention Figure 1 The structure diagram of the medium terahertz receiving module;

[0020] Figure 3 For the present invention Figure 1 The structural diagram of the absorbent material of the homemade power meter;

[0021] Figure 4 For the present invention Figure 1 Flowchart of the process.

[0022] In the figure: 1. terahertz transmitting module; 101. lifting platform; 102. fixture; 103. terahertz transmitting module; 2. parabolic mirror optical component; 21. parabolic mirror bracket; 22. off-axis parabolic mirror one; 23. off-axis parabolic mirror two; 3. terahertz receiving module; 31. homemade power meter back cover; 32. homemade power meter heat sink material back cover; 33. homemade power meter heat sink material; 34. homemade power meter semiconductor thermopile sensor; 35. homemade power meter absorption material; 36. homemade power meter reflection cavity; 37. homemade power meter front cover; 4. two-way moving platform; 41. two-dimensional manual slide; 42. connecting splint. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] like Figures 1 to 4 As shown, the present invention provides a terahertz radiation power measurement device based on SiO2 and ferrite magnetic powder composite material, comprising:

[0025] Terahertz transmitting module 1;

[0026] A parabolic mirror optical component 2, wherein the parabolic mirror optical component 2 is arranged on the back of the terahertz emission module 1;

[0027] A terahertz receiving module 3, wherein a self-made terahertz power meter and a standard terahertz power meter are arranged inside the terahertz receiving module 3, and an alumina thermal insulation ceramic is used as the shell, and the distance between the shell and the power meter is 4 mm at the closest point. The self-made terahertz power meter includes a self-made power meter back cover 31, and a self-made power meter heat sink material back cover 32 is fixedly connected to the left side of the inner wall of the self-made power meter back cover 31, and a self-made power meter heat sink material 33 is movably installed on the right side of the self-made power meter heat sink material back cover 32, and a self-made power meter semiconductor thermopile sensor 34 is movably installed inside the self-made power meter heat sink material 33, and the self-made power meter semiconductor thermopile sensor 34 uses a semiconductor thermopile sensor, which is made of high-purity bismuth telluride material and contains two different types of semiconductors, P-type and N-type. The connection points of the two semiconductors are realized by copper sheet welding, and the number of connection points refers to the number of serial thermocouple pairs, and finally 193 pairs of serial thermocouples are formed. In order to protect the internal structure, the exterior of the homemade power meter semiconductor thermopile sensor 34 is sealed with alumina ceramic and epoxy resin materials. A homemade power meter absorption material 35 is movably installed on the right side of the homemade power meter semiconductor thermopile sensor 34. The homemade power meter absorption material 35 uses SiO2 and ferrite magnetic powder with a particle size of 26 to 40 mesh as doping particles, and black environmentally friendly latex paint and epoxy resin as the base solution. After the two are mixed, the mixed solution is poured into a 4mm×4mm×1mm glass mold. The surface of the mold is coated with a release agent, and the excess solution on the surface is removed by a coater to form a flat and smooth surface. It is then placed in a precision blast drying oven, the oven temperature is set to 70°C, and the drying time is 90 minutes to completely cure it. A homemade power meter reflection cavity 36 is movably installed on the right side of the homemade power meter absorption material 35, and the right side of the homemade power meter reflection cavity 36 is fixedly connected with a homemade power meter front cover 37.

[0028] The bidirectional moving platform 4 is arranged on the right side of the terahertz receiving module 3 .

[0029] refer to Figure 1 The terahertz transmitting module 1 includes a lifting platform 101, a fixture 102 is movably installed on the top of the lifting platform 101, a terahertz transmitting module 103 is movably installed inside the fixture 102, and the terahertz transmitting module 103 includes a driving power supply and a single-frequency terahertz source.

[0030] As a technical optimization solution of the present invention, a single-frequency terahertz source can be emitted by setting a terahertz emission module. The user drives the clamp 102 to move up and down through the lifting platform 101, and the clamp 102 drives the terahertz emission module 103 to move up and down, adjusts the height of the terahertz emission module 103, and emits a single-frequency terahertz source through the terahertz emission module 103.

[0031] refer to Figure 1 The parabolic mirror optical assembly 2 includes a parabolic mirror bracket 21, which is arranged on the back of the lifting platform 101. An off-axis parabolic mirror 1 22 is fixedly connected to the right side of the back side of the inner wall of the parabolic mirror bracket 21, and an off-axis parabolic mirror 2 23 is arranged on the left side of the off-axis parabolic mirror 1 22. The front side of the off-axis parabolic mirror 2 23 is fixedly connected to the front side of the inner wall of the parabolic mirror bracket 21.

[0032] As a technical optimization solution of the present invention, by setting a parabolic mirror optical component 2, single-frequency light can be converted into parallel light. The single-frequency terahertz source light emitted by the terahertz transmitting module 103 is converted into parallel light through the off-axis parabolic mirror 1 22, and the parallel light is then focused by the off-axis parabolic mirror 2 23 and enters the terahertz receiving module 3.

[0033] refer to Figure 1 The bidirectional movable platform 4 includes a two-dimensional manual slide 41 , the left side of the two-dimensional manual slide 41 is movably connected to a connecting clamp 42 , and the left side of the connecting clamp 42 is movably connected to the right side of the terahertz receiving module 3 .

[0034] As a technical optimization solution of the present invention, by setting a bidirectional movable platform 4, the height of the terahertz receiving module 3 can be controlled. The connecting clamp 42 in the bidirectional movable platform 4 clamps the terahertz receiving module 3, and the two-dimensional manual slide 41 adjusts the horizontal and vertical positions of the terahertz receiving module 3 through the connecting clamp 42. The reflection effect of the off-axis parabolic mirror can ensure to the greatest extent that the light beam emitted by the terahertz source is converged into the aperture of the homemade power meter, thereby ensuring that the terahertz radiation power is not affected.

[0035] refer to Figure 4A data acquisition unit and a data processing and display unit are arranged inside the terahertz receiving module 3. The output end of the data acquisition unit is electrically connected to the input end of the data processing and display unit. The data acquisition unit and the data processing and display unit at least include a data acquisition card and a computer system.

[0036] As a technical optimization solution of the present invention, by setting up a data acquisition unit, the data acquisition card is used to collect the output voltage signal of the homemade terahertz power meter. By setting up a data processing and display unit, a computer system can be connected to the data acquisition card to process and display the terahertz power signal.

[0037] The working principle and use process of the present invention are as follows: when in use, the terahertz transmitting module 1 is started, the terahertz transmitting module 1 turns on the terahertz source through the driving power supply, and is left to stand for about 20 minutes to stabilize its output power. After reaching the stable state, the terahertz source radiates single-frequency light, and the single-frequency light enters the interior of the parabolic mirror optical component 2. The single-frequency light is converted into parallel light through the off-axis parabolic mirror 1 11, and the parallel light is focused by the off-axis parabolic mirror 2 12 and enters the terahertz receiving module 3. The self-made terahertz power meter and the standard terahertz power meter are used to measure them respectively, so that the focusing center of the terahertz wave is just aligned with the measurement center point of the terahertz receiving module 3. At this frequency point, the terahertz source is used to emit a radiation beam to act on the self-made terahertz power meter, and its input energy P is the radiation energy output by the terahertz source to the free space. The output signal is in the form of voltage and is collected by the data acquisition card. The response R DUT It can be expressed as:

[0038] R DUT =U DUT / P

[0039] Since terahertz radiation will be absorbed by water vapor in the air when it is transmitted in free space, causing the output radiation energy to attenuate, its radiation energy value needs to be measured using a standard power meter. The effective power value P measured by the standard power meter is S for:

[0040] P S =U S / R S

[0041] In summary, the R of the homemade terahertz power meter responsivity is calculated DUT can be rewritten as

[0042]

[0043] Since the power meter works based on the thermoelectric effect, its measured data will be within a specific fluctuation range after reaching a thermal equilibrium state. In order to obtain accurate measurement values, it is necessary to use a double exponential decay model (Hyperbolic DecayModel) to perform nonlinear fitting on these data, and then extract the effective measurement results of the power meter through computer system processing. After performing nonlinear fitting analysis on the measurement values ​​of the homemade terahertz power meter for the same terahertz source radiation, the average value of 5 measurements is taken as its responsivity R DUT Subsequently, the terahertz radiation of the same beam was continuously measured using a standard power meter and a homemade power meter. A total of 10 measurements were performed, and the output voltage value U of the homemade terahertz power meter was recorded respectively. DUT,i Compared with the output voltage value U of the standard terahertz power meter S,i The effective value P of the two power meters can be calculated by the following formula DUTΙ,i , P S,i :

[0044] P DUTΙ,i =U DUTΙ,i / R DUT

[0045] P S,i =U S,i / R S

[0046] According to the JJF 1117-2010 measurement comparison method, the normalized deviation E n Evaluation and comparison of experimental measurement results, when |E n When |≤1, it means that the comparison result is within the reasonable expected range, and the uncertainty assessment is performed. Through the above steps, the measurement of terahertz power can be completed and the result can be traced back to the superior standard.

[0047] In summary, the terahertz radiation power measurement device based on the SiO2 and ferrite magnetic powder composite material can measure the radiation power with high precision and reduce the measurement uncertainty by setting the terahertz receiving module 3.

[0048] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0049] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A terahertz radiation power measurement device based on SiO2 and ferrite magnetic powder composite material, characterized in that: include: Terahertz transmitting module (1); A parabolic mirror optical component (2), wherein the parabolic mirror optical component (2) is arranged on the back of the terahertz emission module (1); A terahertz receiving module (3), the terahertz receiving module (3) comprising a self-made terahertz power meter and a standard terahertz power meter, the self-made terahertz power meter comprising a self-made power meter back cover (31), the left side of the inner wall of the self-made power meter back cover (31) being fixedly connected to a self-made power meter heat sink material back cover (32), the right side of the self-made power meter heat sink material back cover (32) being movably mounted with a self-made power meter heat sink material (33), the interior of the self-made power meter heat sink material (33) being movably mounted with a self-made power meter semiconductor thermopile sensor (34), the right side of the self-made power meter semiconductor thermopile sensor (34) being movably mounted with a self-made power meter absorption material (35), the right side of the self-made power meter absorption material (35) being movably mounted with a self-made power meter reflection cavity (36), and the right side of the self-made power meter reflection cavity (36) being fixedly connected with a self-made power meter front cover (37); A bidirectional movable platform (4), wherein the bidirectional movable platform (4) is arranged on the right side of the terahertz receiving module (3).

2. The terahertz radiation power measurement device based on SiO2 and ferrite magnetic powder composite material according to claim 1, characterized in that: The terahertz transmitting module (1) comprises a lifting platform (101), a clamp (102) is movably mounted on the top of the lifting platform (101), and a terahertz transmitting module (103) is movably mounted inside the clamp (102).

3. The terahertz radiation power measurement device based on SiO2 and ferrite magnetic powder composite material according to claim 2, characterized in that: The parabolic mirror optical assembly (2) comprises a parabolic mirror bracket (21), the parabolic mirror bracket (21) being arranged on the back side of the lifting platform (101), an off-axis parabolic mirror 1 (22) being fixedly connected to the right side of the back side of the inner wall of the parabolic mirror bracket (21), an off-axis parabolic mirror 2 (23) being arranged on the left side of the off-axis parabolic mirror 1 (22), and a front side of the off-axis parabolic mirror 2 (23) being fixedly connected to the front side of the inner wall of the parabolic mirror bracket (21).

4. The terahertz radiation power measurement device based on SiO2 and ferrite magnetic powder composite material according to claim 3 is characterized in that: The bidirectional movable platform (4) comprises a two-dimensional manual slide (41), the left side of the two-dimensional manual slide (41) being movably connected to a connecting clamp (42), and the left side of the connecting clamp (42) being movably connected to the right side of the terahertz receiving module (3).

5. The terahertz radiation power measurement device based on SiO2 and ferrite magnetic powder composite material according to claim 4, characterized in that: The terahertz receiving module (3) comprises a data acquisition unit and a data processing and display unit, and the output end of the data acquisition unit is electrically connected to the input end of the data processing and display unit.

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