A one-to-many optical fiber receiving circuit module applied to a magnetic field environment

Abstract

The utility model relates to a kind of optical fiber receiving circuit module for one turns many under magnetic field environment, including two-way optical fiber plug input to output end, filter capacitor C1, filter capacitor C2, pull-up resistor R1, pull-up resistor R2, signal reverser, multi-or non gate output circuit and TTL level output circuit;The utility model relates to the technical field of optical fiber receiving circuit, the optical fiber receiving circuit module for one turns many under magnetic field environment, realizes two-way optical fiber signal result logic truth table to determine output, is converted into serial communication, with scalability simultaneously, after accumulation can realize one-to-many optical fiber communication, ensure normal communication under magnetic field environment, reduce cost, without separate optical fiber converter, scalable one-to-many, realize the design of multiple optical fiber module conversion serial port, can be realized stable in high magnetic field environment, communication without influence, for receiving instruction reduces the circuit design of redundancy, maximum degree improves stability and reduces cost.

Description

Technical Field

[0001] This utility model relates to the field of optical fiber receiving circuit technology, specifically to an optical fiber receiving circuit module that can be used in a magnetic field environment for multiple transfers. Background Technology

[0002] In a magnetic resonance imaging (MRI) environment, buttons need to be added to the magnet's exterior for user operation. However, achieving communication between the button panel and the control system is a challenge. With buttons on both sides of the magnet, both buttons need to control the microcontroller to manage the scanning bed. Fiber optic transmission is chosen for communication to minimize magnetic field interference. However, this requires designing a one-to-many fiber optic communication system. While fiber optic converters are commonly used, they only support one-to-one conversion, resulting in low cost and efficiency. Special environmental characteristics: Strong static magnetic field: A static magnetic field (typically 1.5T, 3T or higher) generated by a powerful superconducting magnet between magnets. This magnetic field attracts ferromagnetic objects, causing significant interference or even damage to conventional electronic equipment.

[0003] Time-varying gradient magnetic field: During imaging, the gradient coil rapidly switches currents to generate a strong time-varying magnetic field (used for spatial encoding). These magnetic field changes induce eddy currents, interfering with the electronic signal.

[0004] Strong radio frequency field: Radio frequency coils emit and receive high-frequency electromagnetic waves to excite and detect signals. This can cause serious interference to wireless communication. Radio frequency shielding chamber (Faraday cage): The entire magnet is enclosed in a metal shielding chamber (copper mesh or aluminum plate) to prevent external radio frequency noise from interfering with imaging, while also confining the radio frequency energy generated inside. This greatly hinders the entry and exit of electromagnetic waves (radio, WiFi, Bluetooth, etc.).

[0005] Patient safety: Any device or signal line introduced between magnets must ensure that it does not pose a risk of electric shock, burns, or other harm to the patient. Image quality: The signal transmission itself must not introduce noise that could interfere with the MRI image.

[0006] This patent designs a one-to-many fiber optic to serial converter circuit, which can enable the two side button boards to control the microcontroller simultaneously in a magnetic resonance high magnetic field environment, while avoiding communication interference with scanned images, and also avoiding interference from the magnetic field environment with communication transmission. Utility Model Content

[0007] To address the shortcomings of existing technologies, this invention provides a fiber optic receiver circuit module for use in magnetic field environments, solving the aforementioned problems.

[0008] To achieve the above objectives, this utility model is implemented through the following technical solution: a fiber optic receiver circuit module for use in a magnetic field environment, comprising two fiber optic plugs from input to output, filter capacitor C1, filter capacitor C2, pull-up resistor R1, pull-up resistor R2, signal inverter, multiplex OR gate output circuit and TTL level output circuit. Two fiber optic signal input interfaces are connected to the fiber optic outputs of the button panels on both sides respectively; After each fiber optic signal input, a filter capacitor, a pull-up resistor, and a signal inverter are connected in sequence. A multiplexed NOR gate output circuit, whose inputs are respectively connected to two inverted fiber optic signals; A TTL level output circuit is connected to the output terminal of the multiplexed NOR gate output circuit to convert the logic signal into a TTL level and output it to the microcontroller's serial port.

[0009] As a further embodiment of this invention: the filter capacitors are C1 and C2, which are connected in parallel between the two optical fiber signal input interfaces and ground.

[0010] As a further embodiment of this invention, pull-up resistors R1 and R2 are connected between each fiber optic signal line and the power supply, respectively.

[0011] As a further embodiment of this utility model, the signal inverter is an SN5451 type AND / OR inverting gate circuit.

[0012] As a further embodiment of this invention: a multi-channel NOR gate logic circuit is used to perform logical comparison and selection of two optical fiber signals and output a TTL signal.

[0013] As a further embodiment of this invention, the entire circuit is powered by a DC 5V power supply.

[0014] Compared with the prior art, the present invention has the following advantages: The circuit implements the logic truth table determination output of two-channel fiber optic signal results, converts them into serial communication, and is scalable. Through accumulation, it can achieve one-to-many fiber optic communication, ensuring normal communication in magnetic field environments, reducing costs, eliminating the need for a separate fiber optic converter, and can be expanded to one-to-many, realizing the design of multiple fiber optic modules to serial ports. It can achieve stable and unaffected communication in high magnetic field environments, and the circuit design for receiving instructions reduces redundancy, maximizing stability and reducing costs. Attached Figure Description

[0015] Figure 1 This is a circuit structure block diagram of the present invention. Detailed Implementation

[0016] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0017] Please see Figure 1 This utility model provides a technical solution: a multi-fiber receiving circuit module for use in magnetic field environments, including two fiber optic connectors from input to output, filter capacitors C1 and C2, pull-up resistors R1 and R2, a signal inverter, a multiplexer NOR gate, and a TTL level output circuit. The two fiber optic signals are compared and selected by the NOR gate logic to output a single TTL signal. This utility model relates to the field of multi-fiber optic signal conversion circuit technology. This multi-fiber optic signal conversion circuit uses NOR gates to process multiple fiber optic signals simultaneously. A single chip can generate a single TTL signal through two different fibers in a magnetic field, significantly reducing circuit space and PCB area. The pull-up resistors maintain the stability of the fiber optic signals. After inversion by the inverter, the level signal judgment logic fully conforms to the NOR gate logic, and the power supply uses DC 5V. The design and cost are well controlled. In a multi-fiber optic signal conversion system, each fiber optic path can remain independent, ensuring good stability and consistency of the output TTL level.

[0018] A fiber optic to serial converter circuit can simultaneously receive information from two keypads. Since the keypads do not need to receive data from the control system, a fiber optic receiver circuit is designed to process the data received from the two keypads simultaneously, and then convert it into serial communication for communication with the microcontroller, enabling the transmission of various motion commands of the scanning bed in a magnetic field environment.

[0019] Selecting the SN5451 AND / OR reverse door enables the simultaneous acceptance and output of control commands by two button panels.

[0020] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A fiber optic receiver circuit module for use in magnetic field environments, characterized in that: It includes two fiber optic connectors from input to output, filter capacitor C1, filter capacitor C2, pull-up resistor R1, pull-up resistor R2, signal inverter, multiplex OR gate output circuit and TTL level output circuit; Two fiber optic signal input interfaces are connected to the fiber optic outputs of the button panels on both sides respectively; After each fiber optic signal input, a filter capacitor, a pull-up resistor, and a signal inverter are connected in sequence. A multiplexed NOR gate output circuit, whose inputs are respectively connected to two inverted fiber optic signals; A TTL level output circuit is connected to the output terminal of the multiplexed NOR gate output circuit to convert the logic signal into a TTL level and output it to the microcontroller's serial port.

2. The fiber optic receiver circuit module for use in a magnetic field environment as described in claim 1, characterized in that: The filter capacitors are C1 and C2, which are connected in parallel between the two fiber optic signal input interfaces and ground.

3. The fiber optic receiver circuit module for use in a magnetic field environment as described in claim 1, characterized in that: Pull-up resistors R1 and R2 are connected between each fiber optic signal line and the power supply, respectively.

4. The fiber optic receiver circuit module for use in a magnetic field environment as described in claim 1, characterized in that: The signal inverter is an SN5451 AND / OR inverter circuit.

5. The fiber optic receiver circuit module for use in a magnetic field environment as described in claim 1, characterized in that: The multiplexed NOR gate logic circuit is used to perform logical comparison and selection of two fiber optic signals and output a TTL signal.

6. The fiber optic receiver circuit module for use in a magnetic field environment as described in claim 1, characterized in that: The entire circuit is powered by a DC 5V power supply.

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