Mobile terminal protection shell with nuclear radiation detection function

Abstract

The utility model discloses a mobile terminal protective shell with a nuclear radiation detection function. The mobile terminal protective shell comprises a shell body, the nuclear radiation detection device comprises a shell and a nuclear radiation detection module, the nuclear radiation detection module is embedded into the shell and comprises a scintillator, a SiPM silicon photomultiplier and a signal reading and converting circuit, and the signal reading and converting circuit and the scintillator are integrated in the shell. When rays generated by nuclear radiation interact with the scintillator to generate scintillation light, photons enter the SiPM silicon photomultiplier to trigger electron avalanche, so that the SiPM silicon photomultiplier outputs analog voltage pulse signals, the signal read-out and conversion circuit converts the analog voltage pulse signals into digital signals, the number and amplitude of pulses are counted, and the number and amplitude of the pulses are calculated. And pulse signal data are provided. According to the utility model, the data transmission between the nuclear radiation detection module and the mobile terminal can be realized, the nuclear radiation detection function is realized, the size of the nuclear radiation detection module can be reduced, and the use of various types of mobile phone shells or tablet personal computer protection shells can be met.

Description

Technical Field

[0001] The utility model relates to a mobile terminal protective shell with a nuclear radiation detection function. Background Art

[0002] A nuclear radiation detector is an important device for measuring and monitoring the nuclear radiation level in the environment, helping people understand whether there is a radiation source and the intensity of the radiation in the surrounding environment.

[0003] Common nuclear radiation detection technologies include:

[0004] 1. Gas detector: Utilize the ionization effect generated by nuclear radiation in gas, mainly the Geiger tube. Ionized electrons and positive ions form an electric current in an electric field, and the radiation intensity can be estimated by measuring the intensity of the current.

[0005] 2. Semiconductor detector: Detect nuclear radiation by using the ionization effect in semiconductor materials. The generation and movement of electron-hole pairs generate an electric current in the semiconductor, thereby enabling the measurement of the radiation level.

[0006] 3. Scintillator detector: Through the interaction between nuclear radiation and a scintillation crystal, scintillation light is generated. Different types of radiation will produce different scintillation characteristics in the crystal, and the radiation type and energy are determined by measuring the intensity of the scintillation light.

[0007] Nuclear radiation detectors can use one or more technologies for nuclear radiation detection. For example, the German Kora handheld R700 nuclear radiation detector can be equipped with an external plastic scintillator, a sodium iodide scintillator, and a Geiger tube probe; the domestic Finiris FNIRSIGC-01 personal portable nuclear radiation detector has a built-in Geiger tube and can detect the intensity of α, β, and γ rays; the wristwatch-type personal dosimeter IRD-4 launched by Ditek in China has a built-in cadmium zinc telluride crystal, etc.

[0008] However, the handheld and wristwatch-type nuclear radiation detectors in the prior art are independent instruments with a relatively large thickness and need to be carried separately. Content of the Utility Model

[0009] The purpose of the utility model is to provide a technical solution for a mobile terminal protective shell with a nuclear radiation detection function aiming at the deficiencies of the prior art. It can not only realize data transmission between the nuclear radiation detection module and the mobile terminal, have a nuclear radiation detection function, but also reduce the volume of the nuclear radiation detection module, meet the use of various types of mobile phone cases or tablet computer cases, and is convenient to carry.

[0010] To solve the above technical problems, the utility model adopts the following technical solutions:

[0011] A mobile terminal protective shell with a nuclear radiation detection function, characterized by comprising

[0012] A housing;

[0013] And a nuclear radiation detection module, the nuclear radiation detection module is embedded in the housing, and the nuclear radiation detection module includes a scintillator, a SiPM silicon photomultiplier tube, and a signal reading and conversion circuit. The signal reading and conversion circuit and the scintillator are integrated in the housing;

[0014] The mobile terminal is placed in the housing. When the rays generated by nuclear radiation interact with the scintillator and generate scintillation light, photons enter the SiPM silicon photomultiplier tube to trigger an electron avalanche, so that the SiPM silicon photomultiplier tube outputs an analog voltage pulse signal. The signal reading and conversion circuit converts the analog voltage pulse signal into a digital signal, counts the number and amplitude of the pulses, and gives the pulse signal data. The nuclear radiation detection module transmits the detected surrounding nuclear radiation data to the mobile terminal to realize the display of the nuclear radiation dose on the mobile terminal; Through the design of the above structure, not only can the data transmission between the nuclear radiation detection module and the mobile terminal be realized, with the nuclear radiation detection function, but also the volume of the nuclear radiation detection module can be reduced, meeting the use of various types of mobile phone cases or tablet computer cases, and being convenient to carry.

[0015] Furthermore, the signal reading and conversion circuit includes a TIA transimpedance amplifier, an operational amplifier, an A / D converter, and an MCU single-chip microcomputer. The TIA transimpedance amplifier is electrically connected to the SiPM silicon photomultiplier tube and the operational amplifier respectively. The operational amplifier is electrically connected to the MCU single-chip microcomputer through the A / D converter. The TIA transimpedance amplifier receives the current signal of the SiPM silicon photomultiplier tube and converts it into a voltage signal and transmits it to the operational amplifier. The operational amplifier amplifies the voltage signal and then transmits it to the A / D converter. The voltage signal is converted into a digital signal through the A / D converter and transmitted to the MCU single-chip microcomputer, and data is output.

[0016] Furthermore, the signal reading and conversion circuit uses a flexible circuit board, which can reduce the thickness.

[0017] Furthermore, the nuclear radiation detection module is connected to a power supply module. The power supply module includes a battery, a converter, and an LDO linear voltage regulator. The battery is connected to the converter, the LDO linear voltage regulator, and the Type-C interface respectively, and is used to supply power to the nuclear radiation detection module. The converter includes a DC-DC boost converter or a voltage inverter.

[0018] Furthermore, the scintillator is a plastic scintillator, and the thickness of the scintillator is 2 mm.

[0019] Furthermore, the thickness of the nuclear radiation detection module is less than 4 mm.

[0020] Furthermore, the nuclear radiation detection module is connected to the communication module, and the communication module adopts one of Bluetooth, Zigbee, WiFi, 4G or 5G communication modules to meet the data transmission requirements of different communication protocols.

[0021] Furthermore, the protective case is a mobile phone case or a tablet computer protective case.

[0022] Furthermore, the material of the protective case is at least one of PC, leather, silica gel, cloth, hard plastic, leather case, metal tempered glass or soft plastic.

[0023] Due to the adoption of the above technical solutions, the utility model has the following beneficial effects:

[0024] 1. The utility model can not only realize the data transmission between the nuclear radiation detection module and the mobile terminal, has the nuclear radiation detection function, but also can reduce the volume of the nuclear radiation detection module, meet the use of various types of mobile phone cases or tablet computer protective cases, and is convenient to carry.

[0025] 2. When the rays generated by nuclear radiation interact with the scintillator and generate scintillation light, photons enter the silicon photomultiplier tube to trigger an electron avalanche, so that the SiPM silicon photomultiplier tube outputs an analog voltage pulse signal. The signal readout and conversion circuit converts the analog voltage pulse signal into a digital signal, counts the number and amplitude of the pulses, and gives the pulse signal data. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The following further describes the utility model with reference to the drawings:

[0027] Figure 1 is the effect diagram of a mobile terminal protective case with a nuclear radiation detection function in the utility model;

[0028] Figure 2 is Figure 1 the top view of;

[0029] Figure 3 is the schematic diagram of radiation detection in the utility model;

[0030] Figure 4 is the circuit diagram of the TIA transimpedance amplifier in the utility model;

[0031] Figure 5 is the secondary amplification circuit diagram of the operational amplifier in the utility model;

[0032] Figure 6 is the circuit diagram of the DC-DC boost converter in the utility model;

[0033] Figure 7 is the circuit diagram of the voltage inverter in the utility model;

[0034] Figure 8 This is the circuit diagram of the LDO linear voltage regulator in the present utility model.

[0035] In the figure: 1 - housing; 2 - nuclear radiation detection module; 3 - power supply module; 4 - signal reading and conversion circuit; 5 - SiPM silicon photomultiplier; 6 - scintillator; 7 - communication module; 8 - TIA transimpedance amplifier; 9 - operational amplifier; 10 - A / D converter; 11 - MCU single-chip microcomputer; 12 - battery; 13 - DC-DC boost converter; 14 - LDO linear voltage regulator. Specific embodiments

[0036] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present utility model will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0037] In order to enable those skilled in the art to better understand the solution of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0038] It should be noted that the terms "first", "second", etc. in the specification and claims of the present utility model and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion.

[0039] As Figures 1 to 3 shown, a mobile terminal protective case with a nuclear radiation detection function according to the present utility model includes a housing 1 and a nuclear radiation detection module 2, and the nuclear radiation detection module 2 is embedded in the housing 1. The housing 1 provides physical protection for the mobile terminal and houses each module with the nuclear radiation detection function.

[0040] The mobile terminal can be a mobile phone, a tablet computer or other mobile devices with signal transceiver and display functions. An APP program is installed in the mobile terminal, and the mobile phone client is taken as an example for specific description in the present application.

[0041] After the mobile terminal is placed in the housing 1, the nuclear radiation detection module 2 transmits the detected ambient nuclear radiation data to the mobile terminal, enabling the mobile terminal to display the nuclear radiation dose. Through the design of the above structure, not only can data transmission between the nuclear radiation detection module 2 and the mobile terminal be achieved, with nuclear radiation detection function, but also the volume of the nuclear radiation detection module 2 can be reduced to meet the use of various types of mobile phone cases or tablet computer cases, and it is convenient to carry.

[0042] The nuclear radiation detection module 2 includes a scintillator 6, a SiPM silicon photomultiplier tube 5, and a signal readout and conversion circuit 4. The signal readout and conversion circuit 4 and the scintillator 6 are integrated in the housing 1, and the signal readout and conversion circuit 4 is provided on one side of the scintillator 6. The nuclear radiation detection module 2 is responsible for detecting and preliminarily processing nuclear radiation signals.

[0043] The signal readout and conversion circuit 4 uses a flexible circuit board, which can reduce the thickness.

[0044] The scintillator 6 is preferably a plastic scintillator, and the thickness of the scintillator 6 is 2 mm.

[0045] The signal readout and conversion circuit 4 includes a TIA transimpedance amplifier 8, an operational amplifier 9, an A / D converter 10, and an MCU single-chip microcomputer 11. The TIA transimpedance amplifier 8 is electrically connected to the SiPM silicon photomultiplier tube and the operational amplifier 9 respectively. The operational amplifier 9 is electrically connected to the MCU single-chip microcomputer 11 through the A / D converter 10. The TIA transimpedance amplifier 8 receives the current signal of the SiPM silicon photomultiplier tube and converts it into a voltage signal and transmits it to the operational amplifier 9. The operational amplifier 9 amplifies the voltage signal and transmits it to the A / D converter 10. The voltage signal is converted into a digital signal through the A / D converter 10 and transmitted to the MCU single-chip microcomputer 11, and data is output for converting the analog voltage pulse signal into a digital signal, counting the number and amplitude of the pulses, and giving the pulse signal data.

[0046] The specific circuit of the TIA transimpedance amplifier 8 is as Figure 4 shown. The main function of the circuit is to convert the weak optical signal into a measurable voltage signal. When the SiPM silicon photomultiplier tube D3 receives the optical signal, a weak current signal proportional to the light intensity is generated. When the current flows through the feedback resistor R10 of the TIA transimpedance amplifier 8, according to Ohm's law, the current will be converted into a voltage signal proportional to it, and this voltage is the output voltage of the TIA transimpedance amplifier 8. At the same time, the output voltage of the TIA transimpedance amplifier 8 returns to the negative input terminal through the feedback loop, realizing that when the input current signal changes slightly, the output voltage also changes accordingly. The capacitor at the power input terminal is used for filtering, and the feedback capacitor C18 plays roles such as improving the anti-interference ability of the amplifier, improving the output waveform, and increasing the gain bandwidth.

[0047] The specific circuit of the operational amplifier 9 is as follows Figure 5 As shown, the main function of the circuit is to use the operational amplifier 9 to amplify and filter the input voltage signal with high gain to ensure that the output signal is stable and pure. The input signal passes through resistors and capacitors for preliminary filtering, impedance matching, and voltage division to reach the inverting input terminal of the operational amplifier 9. The feedback loop composed of the feedback resistor R11 and the capacitor C19 determines the gain and frequency response of the operational amplifier 9, and the gain of the amplifier can be set by adjusting the value of the feedback resistor. The capacitor at the power input terminal is used for filtering, and the feedback capacitor plays roles such as improving the anti-interference ability of the amplifier, improving the output waveform, and increasing the gain bandwidth. The output signal of the operational amplifier 9 is decoupled and filtered through the capacitor at the output terminal, and then the magnitude of the output signal is further adjusted through a resistor.

[0048] The SiPM silicon photomultiplier tube is connected to the scintillator 6. When the rays generated by nuclear radiation interact with the scintillator 6 and generate scintillation light, photons enter the SiPM silicon photomultiplier tube 5 to trigger an electron avalanche, causing the SiPM silicon photomultiplier tube 5 to output an analog voltage pulse signal. The signal readout and conversion circuit 4 converts the analog voltage pulse signal into a digital signal, counts the number and amplitude of the pulses, and gives the pulse signal data.

[0049] The thickness of the nuclear radiation detection module 2 is less than 4 mm.

[0050] The nuclear radiation detection module 2 is connected to the power supply module 3. The power supply module 3 includes a battery 12, a converter, and an LDO linear voltage regulator 14. The battery 12 is respectively connected to the converter, the LDO linear voltage regulator 14, and the Type-C interface to supply power to the nuclear radiation detection module 2. The converter includes a DC-DC boost converter or a voltage inverter.

[0051] When the converter uses a DC-DC boost converter 13, its specific circuit can be as follows Figure 6 As shown, the DC-DC boost converter can use MC34063A. The circuit realizes efficient conversion from a lower input voltage to a higher output voltage through the DC-DC boost converter 13. The input voltage enters the input terminal of the MC34063A chip through the inductor L1 and the diode D2. The oscillator, PWM controller, and switching transistor contained inside the chip work together to generate a high-frequency switching signal. When the switching transistor is turned on, the inductor L1 is charged, and the current increases through the inductor. When the switching transistor is turned off, the energy stored in the inductor is released through the diode D2 to increase the output voltage. The output voltage is sent back to the feedback input terminal of the MC34063A through the feedback network composed of R8 and R9 for adjusting and stabilizing the output voltage. The output voltage is then filtered through the subsequent capacitors and inductors to reduce fluctuations and noise. The ratio of R8 and R9 in the circuit determines the magnitude of the output voltage. C5 is used to adjust the frequency of the switch, and the Schottky diode D2 is used to convert AC to DC.

[0052] When the converter uses a voltage inverter, its specific circuit can be as Figure 7 shown. The voltage inverter can use MAX660. The circuit is used to convert positive voltage to negative voltage. MAX660 is a CMOS charge pump voltage converter. It controls the charging and discharging processes of charge pump capacitors C9 and C16 by alternately switching the CMOS switches inside the device, transfers the charge in capacitor C9 to C16, and realizes the inversion of the positive voltage input into a stable negative voltage output. Capacitors C7 and C8 are used for input filtering, and C17 is used for output filtering.

[0053] The specific circuit of the LDO linear voltage regulator 14 is as Figure 8 shown. The LDO linear voltage regulator can use LM317L, which can ensure the normal operation of each module under different voltage requirements. The circuit is used to regulate the input voltage to the required bias voltage and filter the bias voltage at the same time. The input voltage is connected to pin 3, and the output voltage is adjusted by the sizes of resistors R3, R4, and R2 connected to the output terminal and the adjustment terminal pins. Capacitors C2 and C4 are used to filter the output voltage, and diode D1 is used as a protection diode to prevent reverse current from damaging the device.

[0054] The nuclear radiation detection module 2 is connected to the communication module 7. The communication module 7 uses one of the communication modules of Bluetooth, Zigbee, WiFi, 4G, or 5G to meet the data transmission requirements of different communication protocols.

[0055] When the mobile terminal is a mobile phone, the protective case can be a mobile phone case; when the mobile terminal is a tablet computer, the protective case can be a tablet computer protective case.

[0056] The material of the protective case is at least one of PC, leather, silica gel, cloth, hard plastic, leather case, metal tempered glass, or soft plastic.

[0057] When the present utility model is actually used, the mobile terminal is covered with the protective case. The α, β, and γ rays generated by nuclear radiation interact with the plastic scintillator to generate scintillation light. After the photons enter the SiPM silicon photomultiplier tube, an electron avalanche will be triggered, causing the SiPM silicon photomultiplier tube to output an analog voltage pulse signal. The signal readout and conversion circuit converts the analog voltage pulse signal into a digital signal, and counts the number and amplitude of the pulses, provides parameters such as the duration and height of the pulse signal. The communication module transmits the parameters to the mobile terminal, and the mobile terminal App converts the received pulse parameters into a nuclear radiation dose value and displays it in real time.

[0058] The above are only specific embodiments of the present utility model, but the technical features of the present utility model are not limited thereto. Any simple changes, equivalent substitutions, or modifications made based on the present utility model to achieve substantially the same technical effects are all covered by the protection scope of the present utility model.

Claims

1. A mobile terminal protective shell with nuclear radiation detection function, characterized in that: include a housing; and a nuclear radiation detection module, the nuclear radiation detection module is embedded in the housing, the nuclear radiation detection module comprises a scintillator, a SiPM silicon photomultiplier tube and a signal readout and conversion circuit, the signal readout and conversion circuit and the scintillator are integrated in the housing; The mobile terminal is placed in the shell. When the rays generated by nuclear radiation interact with the scintillator and generate scintillation light, photons enter the SiPM silicon photomultiplier tube to trigger electron avalanche, causing the SiPM silicon photomultiplier tube to output an analog voltage pulse signal. The signal readout and conversion circuit converts the analog voltage pulse signal into a digital signal, counts the number and amplitude of the pulses, and gives the pulse signal data. The nuclear radiation detection module transmits the detected surrounding nuclear radiation data to the mobile terminal, so that the mobile terminal can display the nuclear radiation dose in real time.

2. The mobile terminal protective shell with nuclear radiation detection function according to claim 1, characterized in that: The signal readout and conversion circuit includes a TIA transimpedance amplifier, an operational amplifier, an A / D converter and an MCU microcontroller. The TIA transimpedance amplifier is electrically connected to the SiPM silicon photomultiplier tube and the operational amplifier, respectively. The operational amplifier is electrically connected to the MCU microcontroller through the A / D converter. The TIA transimpedance amplifier receives the current signal of the SiPM silicon photomultiplier tube and converts it into a voltage signal and transmits it to the operational amplifier. The operational amplifier amplifies the voltage signal and transmits it to the A / D converter. The voltage signal is converted into a digital signal through the A / D converter and transmitted to the MCU microcontroller, and data is output.

3. The mobile terminal protective shell with nuclear radiation detection function according to claim 2, characterized in that: The signal readout and conversion circuit adopts a flexible circuit board.

4. The mobile terminal protective shell with nuclear radiation detection function according to claim 1, characterized in that: The nuclear radiation detection module is connected to a power supply module, which includes a battery, a converter and an LDO linear regulator. The battery is respectively connected to the converter, the LDO linear regulator and the Type-C interface for supplying power to the nuclear radiation detection module. The converter includes a DC-DC boost converter or a voltage inverter.

5. The mobile terminal protective shell with nuclear radiation detection function according to claim 1, characterized in that: The scintillator is a plastic scintillator.

6. The mobile terminal protective shell with nuclear radiation detection function according to claim 1, characterized in that: The thickness of the nuclear radiation detection module is less than 4 mm.

7. The mobile terminal protective shell with nuclear radiation detection function according to claim 1, characterized in that: The nuclear radiation detection module is connected to a communication module, and the communication module adopts one of Bluetooth, Zigbee, WiFi, 4G or 5G communication modules.

8. The mobile terminal protective shell with nuclear radiation detection function according to claim 1, characterized in that: The protective shell is a mobile phone shell or a tablet computer protective shell.

9. The mobile terminal protective shell with nuclear radiation detection function according to claim 1, characterized in that: The material of the protective shell is at least one of PC, leather, silicone, cloth, hard plastic, leather case, metal tempered glass or soft plastic.

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