Space charged particle total dose detection device
By designing an integrated, miniaturized space charged particle total dose detection device, the problems of large size and high power consumption of radiation dose detectors on satellites have been solved, enabling real-time detection from multiple points and directions, and improving data accuracy and application flexibility.
Patent Information
- Application Number
- CN202410527919.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-29
- Publication Date
- 2025-10-31
AI Technical Summary
The radiation dose detectors on existing satellites are large in size and consume a lot of power, making it impossible to achieve multi-point and multi-directional layout. This results in inaccurate on-orbit dose distribution data, and simulation analysis cannot guarantee the accuracy of the data.
A space charged particle total dose detection device is designed, which adopts an integrated miniaturized packaging structure, including a package housing and an integrated acquisition circuit. It uses a PMOS dosimeter and signal processing circuit to receive charged particles through a trapezoidal channel, and ensures detection accuracy through a constant current source and a reference circuit. The signal output connector adopts a pin-type design, and a positioning component is used to fix the circuit board.
It achieves miniaturized and integrated total dose detection, expands the application range, can be installed at any location on the satellite, provides multi-point and multi-directional real-time detection, improves data accuracy and flexibility, and meets the needs of spacecraft for all-round deployment.
Smart Images
Figure CN120871211A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of aerospace technology, and in particular to a space charged particle total dose detection device. Background Technology
[0002] The impact of charged particles in space on satellites is the most severe. These charged particles mainly include radiation belt particles, solar proton events, and galactic cosmic ray particles. These charged particles can interact with matter to produce radiation dose effects, impacting satellite safety. The radiation dose effect refers to the ionization of atoms and molecules by radiation particles entering the materials and components of a spacecraft, transferring energy to the irradiated material, causing changes in its properties, and even leading to complete failure.
[0003] Currently, many satellites are equipped with radiation dose detectors to monitor the total dose in their orbits, providing data support for on-orbit fault analysis and radiation protection design for subsequent satellites. Given the current size and power consumption of individual radiation dose detectors, and considering the limited satellite resources, multi-point, multi-directional deployment is not feasible. However, to accurately obtain the three-dimensional dose distribution experienced by the entire satellite during its on-orbit operation, simply installing a few monitoring points is far from sufficient; simulation analysis is the only option, but this method cannot guarantee the accuracy of the data analysis. Summary of the Invention
[0004] The purpose of this invention is to overcome the above-mentioned defects of the prior art and thus provide a space charged particle total dose detection device.
[0005] To solve the above-mentioned technical problems, the present invention provides a space charged particle total dose detection device, comprising a package housing and an integrated acquisition circuit; wherein,
[0006] The encapsulation housing includes: a main housing 1, a bottom cover 2, and a trapezoidal channel 3; wherein...
[0007] The main housing 1 has a first opening at the bottom and a second opening at the top;
[0008] The bottom cover plate 2 covers the first opening and is connected to the main housing 1;
[0009] The trapezoidal channel 3 serves as the particle injection channel, with a third opening at the top connected to the second opening, a fourth opening at the bottom, and extending into the encapsulation housing.
[0010] The integrated acquisition circuit, fixed within the package housing, includes: a circuit board and a dose-sensitive sensor connected to the circuit board, wherein...
[0011] The circuit board has a first side facing the trapezoidal channel 3 and a second side facing away from the trapezoidal channel 3;
[0012] The dose-sensitive sensor, used to detect the total dose of charged particles, is disposed on the first side of the circuit board and located directly below the fourth opening, and receives the charged particles being measured.
[0013] As an improvement to the aforementioned device, the integrated acquisition circuit further includes: a signal processing circuit, a power input connector, and a signal output connector; the signal processing circuit includes: a comparison sampling circuit, an amplification output circuit, a constant current source circuit, and a reference circuit; the power input connector is electrically connected to an external power source to power the dose-sensitive sensor and the signal processing circuit; the constant current source circuit provides a matching constant current source for the dose-sensitive sensor; the reference circuit provides a reference voltage for the amplification output circuit; the threshold voltage drift output by the dose-sensitive sensor is processed sequentially by the comparison sampling circuit and the amplification output circuit before being output through the signal output connector. The circuit's integrated design improves upon this improvement, reducing the circuit board area.
[0014] As an improvement to the above-mentioned device, the signal processing circuit, power input connector, and signal output connector are disposed on the second side of the circuit board and avoid the projection of the dose-sensitive sensor.
[0015] As an improvement to the above-mentioned device, both the power input connector and the signal output connector adopt a pin-type design; the bottom cover plate 2 is provided with through holes that match the pins 4 one-to-one and have a diameter larger than the pins 4; one end of the pin 4 is soldered to the second side of the circuit board, and the other end protrudes through the through hole.
[0016] As an improvement to the above-mentioned device, the device further includes: a positioning element 5, located inside the packaging housing, fixedly connected to the packaging housing and the integrated acquisition circuit respectively, for supporting the integrated acquisition circuit, and also provided with the lead-out hole 51 of the pin 4.
[0017] As an improvement to the above-mentioned device, the positioning element 5 is made of polyimide.
[0018] As an improvement to the above-mentioned device, the trapezoidal channel 3 is integrally formed with the main housing 1.
[0019] As an improvement to the above-mentioned device, the main housing 1 and the bottom cover 2 are made of copper.
[0020] As an improvement to the above-mentioned device, the bottom cover plate 2 is provided with a fitting groove that matches the first opening of the main housing 1; the first opening is embedded in the fitting groove and welded together.
[0021] Compared to existing technologies, the advantages of this invention lie in its space charged particle total dose detection device, which changes the original stand-alone design of total dose detectors. Through innovative changes in circuitry and packaging, the total dose detection circuit is miniaturized and integrated to the greatest extent possible. This small size greatly expands the application range, allowing it to be installed not only at any location on a satellite but also inside the payload of any spacecraft, enabling real-time detection from multiple points and directions. Attached Figure Description
[0022] Figure 1 A first three-dimensional view of a space-based total dose detection device for charged particles;
[0023] Figure 2 A top view of a space-based total dose detection device for charged particles;
[0024] Figure 3 A second perspective view of the space-based total dose detection device for charged particles;
[0025] Figure 4 This is a structural schematic diagram of the positioning component 5;
[0026] Figure 5 This is a circuit block diagram.
[0027] Attached Figure Labels
[0028] 1. Main shell 2. Bottom cover 3. Trapezoidal channel
[0029] 4. Pin; 5. Positioning component; 51. Lead-out hole
[0030] 52. Positioning post Detailed Implementation
[0031] The technical solutions provided by the present invention will be further illustrated below with reference to the embodiments.
[0032] 1. Product Specifications
[0033] Table 1 Summary of Indicators for Space Charged Particle Total Dose Detection Devices
[0034] Serial Number Indicator Item Measured value 1 Encapsulation housing 3.00cm × 2.43cm × 0.89cm 2 Power consumption 0.02±0.01W 3 weight 20±2g 4 Maximum detection sensitivity 1 rad (Si) 5 Maximum detection range 1000k rad(Si)
[0035] 2. Composition and Connections
[0036] The space charged particle total dose detection device consists of two parts: a package housing and an integrated circuit.
[0037] The outer shell of the package is made of copper. Copper has a much higher density than aluminum, so the shell can be made relatively thinner while still meeting radiation shielding requirements, resulting in a smaller module size.
[0038] like Figure 1 As shown, the encapsulation housing includes a main housing 1, a bottom cover 2, and a trapezoidal channel 3;
[0039] The main housing 1 has a first opening at the bottom and a second opening at the top;
[0040] The bottom cover plate 2 covers the first opening and is connected to the main housing 1;
[0041] like Figure 2 As shown, the trapezoidal channel 3 serves as the particle injection channel, with a third opening at the top connected to the second opening, a fourth opening at the bottom, and extending into the encapsulation housing.
[0042] The trapezoidal channel 3 is integrally formed with the main housing 1.
[0043] The integrated acquisition circuit, fixed within the package housing, includes: a circuit board and a dose-sensitive sensor connected to the circuit board, wherein...
[0044] The circuit board has a first side facing the trapezoidal channel 3 and a second side facing away from the trapezoidal channel 3;
[0045] The dose-sensitive sensor, used to detect the total dose of charged particles, is disposed on the first side of the circuit board and located directly below the fourth opening, and receives the charged particles being measured.
[0046] The main housing 1 is a single-piece structure, and the bottom cover plate 2 is designed with a recessed groove to facilitate the fixing of the main housing 1. Finally, the two housing structures are sealed by welding. Figure 4 The housing shown has a polyimide positioning element 5 inside, which connects the integrated circuit board and the packaging housing, and serves to support and fix the integrated circuit board.
[0047] Integrated circuits include: dose-sensitive sensors, signal processing circuits, and power input and signal output connectors. The integrated circuit board is fixed inside a package housing. Figure 2 As shown, a trapezoidal channel 3 is formed in the housing corresponding to the dose-sensitive sensor, serving as a particle injection port. Other components on the circuit board are shielded within a copper housing and positioned away from the sensor. In other words, the dose-sensitive sensor is mounted on the first side of the circuit board facing the trapezoidal channel 3, directly below it. Other important components with different functions are located on the second side of the circuit board, away from the trapezoidal channel 3, and their mounting positions avoid overlapping with the dose-sensitive sensor. Figure 3 As shown, the power input and signal output connectors adopt a pin-type design, with one end soldered to the integrated circuit board and the other end connected via... Figure 4The lead-out hole 51 of the polyimide positioning element 5 and the through hole of the bottom cover plate 2 of the package housing lead out to the outside of the housing. The position of the bottom plate through hole is strictly consistent with the position of the signal pin 4, and the hole diameter is larger than the diameter of the pin 4 to prevent short circuit.
[0048] 3. Detection Principle
[0049] This invention uses a PMOS dosimeter as the dose-sensitive sensor. Its main structure is a P-channel field-effect transistor (RADFET). The basic principle is to use threshold voltage drift as a sensitive parameter for the total charged particle dose. When the PMOS is irradiated by charged particles in space, under the influence of ionizing radiation and an applied electric field, oxide charges are generated in its gate oxide layer, and interface states are formed at the Si / SiO2 interface, leading to threshold voltage drift. The magnitude of the threshold voltage drift has a certain correlation with the received irradiation dose; based on this correlation, the detection data of the total charged particle dose can be obtained.
[0050] To ensure the normal operation of the PMOS dosimeter, a constant current source is provided as the operating point. The PMOS gate voltage is collected and output after passing through the back-end comparison sampling circuit and amplification circuit.
[0051] 4. Technical Solution
[0052] PMOS dosimeters are radiation-sensitive field-effect transistor devices manufactured using special processes. The thickness of their gate oxide layer is closely related to their detection sensitivity and range. A thicker gate oxide layer results in higher sensitivity but a smaller detection range; conversely, a thinner gate oxide layer results in lower sensitivity but a larger detection range. This invention allows for the selection of appropriate PMOS dosimeter specifications to meet different performance requirements based on mission needs.
[0053] The PMOS dosimeter's back-end matching circuit includes functional modules such as a constant current source circuit, a reference circuit, a comparison sampling circuit, and a signal amplification and output circuit. The circuit block diagram is shown below. Figure 5 As shown, the constant current source circuit provides a suitable constant current source for the PMOS dosimeter to ensure the normal operation of the sensor; the reference circuit provides a stable reference voltage for the comparison sampling circuit, thereby ensuring that the comparison sampling circuit can accurately measure the change in the sensor output voltage. After the change in the sensor output voltage is measured by the comparison sampling circuit, the voltage signal is output through the signal amplification output circuit.
[0054] The space charged particle total dose detection device is a cubic structure with a trapezoidal channel 3 at the top corresponding to the sensor position, serving as the entrance for the measured particles. A total of 6 pins 4 are led out from both sides of the bottom. One side has 4 pins 4 as the working power (+12V and ground) input connectors, and the other side has 2 pins 4 as the signal output connectors. Both are designed with dual-point backup to prevent the risk of single-point failure.
[0055] The internal integrated circuit board is fixed to the inside of the copper housing by polyimide positioning components 5. The polyimide positioning component 5 is a specially designed irregular structure with lead-out holes 51 for power input and signal output pins 4, ensuring the secure connection of the pins 4 and preventing short circuits between adjacent pins 4. In addition, the polyimide positioning component 5 also has four positioning posts 52, each corresponding to a mounting hole on the integrated circuit board, for securing the integrated circuit board.
[0056] The copper encapsulation housing consists of two parts: a main housing 1 and a bottom cover 2. The bottom cover 2 has recessed grooves around its perimeter. After the integrated circuit board and polyimide positioning components are installed inside the main housing 1, the bottom edge of the main housing 1 is fitted into the grooves of the bottom cover 2 and sealed by welding.
[0057] The main innovation of this invention lies in its integrated design. While ensuring detection functionality, it changes the original aerospace total dose detection mode: the total dose detector is redesigned from a bulky standalone unit into a highly integrated functional module. This innovative and improved functional module scheme has significant advantages in terms of size, power consumption, and weight, thus making its application more flexible.
[0058] This invention innovatively achieves a modular design, saving spacecraft resources. It not only maintains the functionality of previous on-orbit total dose detection, but also, due to its small size, low power consumption, and light weight, can be more flexibly mounted on spacecraft, enabling comprehensive, multi-depth dose monitoring and placement within the spacecraft. Previously, due to limited resources, large-scale dose monitoring point layout was impossible, requiring simulation for dose distribution analysis within spacecraft. This invention overcomes this technological limitation, making comprehensive layout possible, thereby improving the accuracy of detection data and filling this technological gap.
[0059] Based on ground calibration results, this detection module can achieve a detection accuracy of 1 rad (Si) according to detection requirements, and the maximum detection range can reach 1000 krad (Si), which meets the requirements for total dose detection in orbit.
[0060] The encapsulation design also better meets the requirements of miniaturized modules, with the packaged dose detection module measuring only 3.00cm × 2.43cm × 0.89cm. It can be installed as an independent detection module inside spacecraft or any payload, enabling the detection of total dose within the spacecraft or even within the payload itself, thus improving the flexibility of detection applications. Its small size and low power consumption facilitate multi-point installation, making large-scale deployment of detection possible. Once applied, it can respond in real-time to the total dose distribution across all directions and depths of the spacecraft, providing monitoring and early warning, ensuring spacecraft operational safety, and playing a significant role in promoting my country's space environment situational awareness.
[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art should understand that modifications or equivalent substitutions to the technical solutions of the present invention do not depart from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.
Claims
1. A space charged particle total dose detection device, comprising a housing and an integrated acquisition circuit; wherein, The encapsulation housing includes: a main housing (1), a bottom cover (2), and a trapezoidal channel (3); wherein, The main housing (1) has a first opening at the bottom and a second opening at the top; The bottom cover plate (2) covers the first opening and is connected to the main housing (1); The trapezoidal channel (3) serves as the particle injection channel, with a third opening at the top connected to the second opening, a fourth opening at the bottom, and extending into the encapsulation housing. The integrated acquisition circuit, fixed within the package housing, includes: a circuit board and a dose-sensitive sensor connected to the circuit board, wherein... The circuit board has a first side facing the trapezoidal channel (3) and a second side facing away from the trapezoidal channel (3); The dose-sensitive sensor, used to detect the total dose of charged particles, is disposed on the first side of the circuit board and located directly below the fourth opening, and receives the charged particles being measured.
2. The space charged particle total dose detection device according to claim 1, characterized in that, The integrated acquisition circuit also includes: a signal processing circuit, a power input connector, and a signal output connector; The signal processing circuit includes: a comparison sampling circuit, an amplification output circuit, a constant current source circuit, and a reference circuit; The power input connector is electrically connected to an external power source to power the dose-sensitive sensor and signal processing circuit. The constant current source circuit is used to provide a matching constant current source for the dose-sensitive sensor; The reference circuit is used to provide a reference voltage for the amplification output circuit; The threshold voltage drift output by the dose-sensitive sensor is processed sequentially by a comparison sampling circuit and an amplification output circuit before being output through a signal output connector.
3. The space charged particle total dose detection device according to claim 2, characterized in that, The signal processing circuit, power input connector, and signal output connector are located on the second side of the circuit board and are positioned away from the projection of the dose-sensitive sensor.
4. The space charged particle total dose detection device according to claim 3, characterized in that, Both the power input connector and the signal output connector adopt a pin-type design; the bottom cover plate (2) is provided with a through hole that matches the pin (4) one by one and has a diameter larger than the pin (4); one end of the pin (4) is soldered to the second side of the circuit board, and the other end passes through the through hole.
5. The space charged particle total dose detection device according to claim 4, characterized in that, The device further includes: a positioning element (5), located inside the packaging housing, which is fixedly connected to the packaging housing and the integrated acquisition circuit respectively, for supporting the integrated acquisition circuit, and also provided with a lead-out hole (51) for the pin (4).
6. The space charged particle total dose detection device according to claim 5, characterized in that, The positioning element (5) is made of polyimide.
7. The space charged particle total dose detection device according to claim 1, characterized in that, The trapezoidal channel (3) is integrally formed with the main shell (1).
8. The space charged particle total dose detection device according to claim 1, characterized in that, The main housing (1) and the bottom cover (2) are made of copper.
9. The space charged particle total dose detection device according to claim 1, characterized in that, The bottom cover plate (2) is provided with a fitting groove that matches the first opening of the main housing (1); the first opening is embedded in the fitting groove and welded together.