Accelerometer single-channel precision shielded sampler

Abstract

The utility model discloses an accelerometer single -channel precision shielding sampler, including shielding shell and the detection circuit of being established in it, shielding shell is including detachable connection's upper casing and lower casing, and the upper casing is seted up with the upper through -hole, and the upper through -hole is equipped with the metal connector, the lower casing is seted up with the lower through -hole, and the lower through -hole is equipped with the metal grounding column, the signal input point of metal connector is connected with the accelerometer of being measured, and the signal output point of metal connector is connected with digital voltmeter, the utility model discloses the detection circuit including precision sampling resistance is seted up in shielding shell, like this makes the whole signal conversion link all is in the continuous shielding environment, has realized the collection, conditioning of accelerometer weak current signal, possesses excellent anti -environment electromagnetic interference ability.

Description

Technical Field

[0001] This utility model belongs to the field of accelerometer sampling technology, and relates to an accelerometer single-channel precision shielded sampler. Background Technology

[0002] Accelerometers are an important component of inertial navigation systems. Their output is a current signal proportional to the magnitude of acceleration. Since the current signal cannot be directly acquired, it needs to be converted and then acquired by the back-end processing circuit.

[0003] When converting the current from an existing accelerometer into a pulse or frequency signal, the traditional analog current-to-frequency conversion circuit mainly consists of a constant current source, an integrator, a comparator, and a switching circuit. The integrator integrates the input current, and the resulting voltage value is compared with a comparator of a fixed value. The output control signal controls the constant current source to charge and discharge the integrating capacitor of the integrator, thereby generating a corresponding proportional pulse signal to achieve the current-to-frequency conversion function. This solution places extremely high precision requirements on the integrating circuit, constant current source, and analog switches; conventional components are unlikely to meet the expected accuracy requirements.

[0004] When converting the current of an existing accelerometer to I / V, the accuracy of the front-end I / V conversion circuit is high, the on-board ADC has high noise, the overall accuracy is low, and the implementation cost is high.

[0005] For accelerometers, it is usually necessary to reduce noise and improve output sensitivity, especially in the case of collecting weak currents in electromagnetic interference environments, which is a major challenge. Summary of the Invention

[0006] The technical problem solved by this utility model is to provide a single-channel precision shielded sampler for accelerometers, which has excellent resistance to environmental electromagnetic interference.

[0007] This utility model is achieved through the following technical solution:

[0008] An accelerometer single-channel precision shielded sampler includes a shielding shell and a detection circuit disposed therein;

[0009] The shielding shell includes a detachably connected upper shell and a lower shell. The upper shell has an upper through hole, and a metal connector is installed in the upper through hole. The lower shell has a lower through hole, and a metal grounding post is installed in the lower through hole.

[0010] The signal input point of the metal connector is connected to the accelerometer being measured, and the signal output point of the metal connector is connected to the digital voltmeter.

[0011] The detection circuit includes a center contact, and a detection element is connected to the center contact via a connecting line. The input of the center contact is connected to the signal input point of the metal connector, and the output is connected to the signal output point of the metal connector. The detection element includes a sampling resistor and an RC filter circuit.

[0012] The RC filter circuit includes a resistor R2 and capacitors C1 and C2 connected in parallel, and the sampling resistor R1 is connected in series with the resistor R2.

[0013] The detection circuit is connected to a metal connector via a nut;

[0014] The metal grounding post is connected to the lower shell via double nuts;

[0015] The upper shell and the lower shell are connected by threads.

[0016] The detection elements are connected to the center contact via a curved connecting wire, and the detection elements are evenly distributed around the metal connector.

[0017] Furthermore, the current signal output by the accelerometer under test enters the detection circuit through the signal input point of the metal connector. After the detection circuit performs current-to-voltage conversion and filtering conditioning, the conditioned signal is output to the digital voltmeter through the signal output point of the metal connector.

[0018] Compared with the prior art, the present invention has the following beneficial technical effects:

[0019] The single-channel precision shielded sampler for accelerometers provided by this utility model uses an upper shell and a lower shell to form a shielded shell, with metal connectors and metal grounding posts at both ends. The detection circuit, including a precision sampling resistor, is cleverly placed inside the shielded shell, so that the entire signal conversion process is in a continuously shielded environment: the weak current signal output by the device under test enters the detection circuit inside the shielded shell through the metal connector, is conditioned into a voltage signal by the precision sampling resistor and RC filter circuit, and is then output through the metal connector for acquisition by a high-precision voltmeter. This utility model realizes the acquisition and conditioning of weak current signals from accelerometers and has excellent resistance to environmental electromagnetic interference. Attached Figure Description

[0020] Figure 1 This is an exploded view of the structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the structure of this utility model;

[0022] Figure 3 This is a structural diagram of the detection circuit of this utility model;

[0023] Among them, 1 is a metal connector, 2 is a resistance value label, 3 is the upper shell, 4 is a nut, 5 is a detection circuit, 6 is a double nut, 7 is the lower shell, and 8 is a metal grounding post. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings. These descriptions are intended to explain the present invention and not to limit it.

[0025] See Figure 1 , Figure 2 An accelerometer single-channel precision shielded sampler includes a shielding shell and a detection circuit 5 disposed therein;

[0026] The shielding shell includes a detachably connected upper shell 3 and a lower shell 7. The upper shell 3 has an upper through hole, and a metal connector 1 is provided in the upper through hole; the lower shell 7 has a lower through hole, and a metal grounding post 8 is provided in the lower through hole.

[0027] The signal input point of metal connector 1 is connected to the accelerometer under test, and the signal output point of metal connector 1 is connected to the digital voltmeter.

[0028] The detection circuit 5 includes a center contact, and the detection element is connected to the center contact via a connecting line. The input of the center contact is connected to the signal input point of the metal connector 1, and the output is connected to the signal output point of the metal connector 1. The detection element includes a sampling resistor and an RC filter circuit.

[0029] See Figure 3 The RC filter circuit includes a resistor R2 and capacitors C1 and C2 connected in parallel, and the sampling resistor R1 is connected in series with the resistor R2; wherein the resistor R2 is 10kΩ, C1 is 10μF, and C2 is 0.1μF.

[0030] Specifically, the detection circuit 5 is connected to the metal connector 1 via the nut 4;

[0031] The metal grounding post 8 is connected to the lower shell 7 via double nuts 6;

[0032] The upper shell 3 and the lower shell 7 are connected by threads, and both the upper shell 3 and the lower shell 7 are made of aluminum alloy.

[0033] This combination of the upper shell 3, lower shell 7, metal connector 1, and metal grounding post 8 forms a complete shielded environment, which facilitates signal input and output while ensuring that the entire signal conversion process is in a continuously shielded environment.

[0034] Furthermore, in order to house the detection circuit within the limited space inside the shielding shell, the connecting wires are bent and heat-treated to form a shape that can both connect the detection element and provide support for it.

[0035] This method connects the detection elements to the center contact via a bent connecting wire, with the detection elements evenly distributed around the metal connector; thus, the detection circuit is cleverly arranged within the shielded housing.

[0036] The single-channel precision shielded sampler for accelerometers provided by this utility model allows the current signal output by the accelerometer under test to enter the detection circuit through the signal input point of the metal connector during accelerometer signal testing. After the detection circuit performs current-to-voltage conversion and filtering conditioning, the conditioned signal is output to the digital voltmeter through the signal output point of the metal connector, thereby completing the acquisition of a weak output signal from the accelerometer.

[0037] The single-channel precision shielded sampler for accelerometers provided by this utility model is in a continuously shielded environment throughout the entire signal conversion process, enabling the acquisition and conditioning of weak current signals from the accelerometer and possessing excellent resistance to environmental electromagnetic interference.

[0038] The embodiments given above are preferred examples of implementing this utility model, and this utility model is not limited to the above embodiments. Any non-essential additions or substitutions made by those skilled in the art based on the technical features of the technical solution of this utility model shall fall within the protection scope of this utility model.

Claims

1. A single-channel precision shielded sampler for accelerometers, characterized in that, Includes a shielding shell and a detection circuit housed within it; The shielding shell includes a detachably connected upper shell and a lower shell. The upper shell has an upper through hole, and a metal connector is installed in the upper through hole. The lower shell has a lower through hole, and a metal grounding post is installed in the lower through hole. The signal input point of the metal connector is connected to the accelerometer being measured, and the signal output point of the metal connector is connected to the digital voltmeter. The detection circuit includes a center contact, and a detection element is connected to the center contact via a connecting line. The input of the center contact is connected to the signal input point of the metal connector, and the output is connected to the signal output point of the metal connector. The detection element includes a sampling resistor and an RC filter circuit.

2. The single-channel precision shielded sampler for accelerometers as described in claim 1, characterized in that, The RC filter circuit includes a resistor R2 and capacitors C1 and C2 connected in parallel, and the sampling resistor R1 is connected in series with the resistor R2.

3. The single-channel precision shielded sampler for accelerometers as described in claim 1, characterized in that, The detection circuit is connected to a metal connector via a nut; The metal grounding post is connected to the lower shell via double nuts; The upper shell and the lower shell are connected by threads.

4. The single-channel precision shielded sampler for accelerometers as described in claim 1, characterized in that, The detection elements are connected to the center contact via a curved connecting wire, and the detection elements are evenly distributed around the metal connector.

5. The single-channel precision shielded sampler for accelerometers as described in claim 1, characterized in that, The current signal output by the accelerometer under test enters the detection circuit through the signal input point of the metal connector. After the detection circuit performs current-to-voltage conversion and filtering conditioning, the conditioned signal is output to the digital voltmeter through the signal output point of the metal connector.

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