Pre-amplification module of multi-mode vector hydrophone

Abstract

The invention provides a pre-amplification module of a multi-mode vector hydrophone, which can be programmed through pins and has multiple working modes so as to adapt to three main types of vector hydrophones, namely an accelerometer co-oscillation type vector hydrophone, a speedometer co-oscillation type vector hydrophone and a differential pressure vector hydrophone. Therefore, the integration difficulty of the hybrid vector array equipment is effectively reduced, and the maintainability of the equipment is improved. The pre-amplification module of the multi-mode vector hydrophone comprises an amplification unit, a constant current source unit, a filtering unit and a programming configuration unit, wherein a plurality of different circuit units are configured in the programming configuration unit and are respectively used for adapting to different types of vector hydrophones; and the programming configuration unit adapts to signals output by the front-end vector hydrophone by switching internal circuit units participating in signal processing.

Description

Technical Field

[0001] The present invention relates to a preamplification module, and more particularly to a multi-mode vector hydrophone preamplification module, belonging to the field of underwater acoustic electronics technology. Background Art

[0002] Sonar is an important tool for marine scientific research and marine resource development, used to measure marine environmental parameters such as seabed topography, ocean current velocity, ocean temperature, marine organisms, etc., as well as to detect marine resources such as offshore oil and gas fields, mineral deposits, and shipwrecks. With the development of sonar technology, vector hydrophone arrays are used more and more widely. Vector hydrophones are classified into multiple types according to different sensitive elements and sensing principles. The three most commonly used types are accelerometer co-vibration type vector hydrophones, velocimeter co-vibration type vector hydrophones, and pressure difference type vector hydrophones; the preamplifiers required for these three types of vector hydrophones are also different.

[0003] The preamplifier of the accelerometer co-vibration type vector hydrophone is generally divided into a sound pressure channel and a vector channel. The principle of the sound pressure channel is the same as that of the preamplifier of a conventional piezoelectric hydrophone. Since the internal sensitive software of the vector channel is an accelerometer, the corresponding channel of the preamplifier also requires a constant current source power supply function; for the pressure difference vector hydrophone, the signals of both the vector and sound pressure channels are generated by a combination of piezoelectric sensitive elements at fixed positions, and a signal synthesis circuit is often required to synthesize the signals to generate the signals of the vector and sound pressure channels to achieve signal pickup.

[0004] Currently, preamplifiers corresponding to hydrophones are often developed for different types of vector hydrophones. The general principles, compositions, and appearances of the preamplifiers for different types of vector hydrophones are different and cannot be used interchangeably. In the application scenario of joint arraying of multiple array elements, different array elements corresponding to different preamplifiers increase the integration difficulty of the equipment and reduce the maintainability of the equipment. Summary of the Invention

[0005] In view of this, the present invention provides a multi-mode vector hydrophone preamplification module, which can be programmed through pins and has multiple working modes to adapt to the three main types of vector hydrophones, namely accelerometer co-vibration type vector hydrophones, velocimeter co-vibration type vector hydrophones, and pressure difference vector hydrophones, thereby effectively reducing the integration difficulty of hybrid vector array equipment and improving the maintainability of the equipment.

[0006] The technical solution of the present invention is: a multi-mode vector hydrophone preamplification module, comprising: an amplification unit, a constant current source unit, a filtering unit, and a programming and configuration unit;

[0007] The amplification unit is used to amplify the signal output by the vector hydrophone and perform impedance transformation;

[0008] The constant current source unit is used to provide an excitation source for the velocity channel of the vector hydrophone;

[0009] The amplification unit outputs the amplified signal to the filtering unit for filtering to select the target signal;

[0010] The filtering unit outputs a signal to the programming and configuration unit, in which a variety of different circuit units are configured, respectively used to adapt to different types of vector hydrophones; the programming and configuration unit adapts the signal output by the front-end vector hydrophone by switching the circuit units participating in signal processing inside.

[0011] As a preferred embodiment of the present invention: a post-stage driving unit is further included, the programming and configuration unit outputs a signal to the post-stage driving unit, and the post-stage driving unit is used to increase the driving ability and reduce the interference and loss of signal transmission.

[0012] As a preferred embodiment of the present invention: three circuit units are configured in the programming and configuration unit, respectively used to adapt to the co-vibration mode vector hydrophone of the accelerometer, the co-vibration mode vector hydrophone of the velocimeter, and the differential pressure vector hydrophone.

[0013] As a preferred embodiment of the present invention: the programming control unit includes: a programming and configuration chip K1 and a programming and configuration chip K2;

[0014] The programming and configuration chip K1 uses a differential amplifier A, and the programming and configuration chip K2 uses a differential amplifier B;

[0015] One end of the resistor R1 serves as the first input interface, and the other end is connected to the negative input pin of the differential amplifier A; one end of the resistor R2 is connected to the positive input pin of the differential amplifier A; the capacitors C1 and C2 are power supply bypass capacitors of the differential amplifier A; the reference voltage pin of the differential amplifier A is grounded, and the detection pin is connected to its output pin;

[0016] The negative input pin of the differential amplifier B is grounded, one end of the resistor R4 serves as the second input interface, and the other end is connected to the positive input pin of the differential amplifier B; at the same time, the other end of the resistor R2 is connected to the second input interface; one end of the resistor R3 is connected to the first input interface, and the other end is connected to the reference voltage pin of the differential amplifier B; the capacitors C3 and C4 are power supply bypass capacitors of the differential amplifier B; the detection pin of the differential amplifier B is connected to its output pin;

[0017] The output pins of the differential amplifier A and the differential amplifier B are connected together and jointly serve as the output of the programming control unit;

[0018] When the output of the filtering unit is connected to the first input interface of the programming control unit, a first working mode is formed. At this time, the circuit participating in signal processing is the first circuit unit; when the output of the filtering unit is connected to the second input interface of the programming control unit, a second working mode is formed. At this time, the circuit participating in signal processing is the second circuit unit; when the output of the filtering unit is connected to the first input interface and the second input interface respectively, a third working mode is formed. At this time, the circuit participating in signal processing is the third circuit unit.

[0019] As a preferred embodiment of the present invention: the amplifying unit includes: an instrumentation amplifier K1 and a peripheral configuration circuit;

[0020] The peripheral configuration circuit includes: a gain adjustment resistor R3 connected between two gain setting pins of the instrumentation amplifier K1, a capacitor C1 connected to the negative input pin of the instrumentation amplifier K1, a capacitor C2 connected to the positive input pin of the instrumentation amplifier K1, a resistor R1 with one end grounded and the other end connected between the capacitor C1 and the negative input pin of the instrumentation amplifier K1, a resistor R2 with one end grounded and the other end connected between the capacitor C2 and the positive input pin of the instrumentation amplifier K1, a capacitor C3 with one end grounded and the other end connected to the positive power supply pin +VS, and a capacitor C4 with one end grounded and the other end connected to the negative power supply pin.

[0021] As a preferred embodiment of the present invention: the constant current source unit uses a high-precision voltage regulator and a regulating resistor to provide a stable output current.

[0022] As a preferred embodiment of the present invention: the filtering unit includes a cascaded connection of a high-pass filter and a low-pass filter;

[0023] Both the high-pass filter chip K1A and the low-pass filter chip K1B use operational amplifiers, which are operational amplifier A and operational amplifier B respectively;

[0024] One end of the capacitor C5 is connected to the output of the amplifying unit, and the other end is connected in series with the capacitor C6 and then connected to the positive input pin of the operational amplifier A. One end of the resistor R6 is connected to the negative input pin of the operational amplifier A, and the other end is connected between the capacitor C5 and the capacitor C6. One end of the resistor R7 is grounded, and the other end is connected to the positive input pin of the operational amplifier A; the capacitors C7 and C8 are power supply bypass capacitors of the operational amplifier A;

[0025] One end of the resistor R8 is connected to the output pin of the operational amplifier A, and the other end is connected in series with the resistor R9 and then connected to the positive input pin of the operational amplifier B; one end of the capacitor C9 is connected between the resistor R8 and the resistor R9, and the other end is connected to the negative input pin of the operational amplifier B; one end of the capacitor C10 is grounded, and the other end is connected to the positive input pin of the operational amplifier B.

[0026] As a preferred embodiment of the present invention: The post-stage drive unit uses negative feedback to achieve the matching between the output voltage and the input voltage.

[0027] Advantageous effects:

[0028] (1) The pre-amplification module of the multi-mode vector hydrophone of the present invention can have multiple working modes through pin programming to adapt to different types of vector hydrophones, thereby effectively reducing the integration difficulty of the hybrid vector array device and improving the maintainability of the device.

[0029] (2) In the pre-amplification module of the multi-mode vector hydrophone of the present invention, three circuit units are configured in the programming and configuration unit, which are respectively used to adapt to the co-vibration type vector hydrophone of the accelerometer, the co-vibration type vector hydrophone of the velocimeter, and the differential pressure vector hydrophone.

[0030] (3) In the present invention, by setting the constant current source unit, an excitation source can be provided for the vibration velocity channel of the vector hydrophone.

[0031] (4) In the present invention, a post-stage drive unit is further provided to increase the circuit drive ability, so as to greatly reduce the interference and loss of signal transmission and ensure the high-fidelity transmission of signals in the case of long cables and the like. Description of the drawings

[0032] Figure 1 is the overall architecture diagram of the pre-amplification module of the multi-mode vector hydrophone of the present invention;

[0033] Figure 2 is the circuit schematic diagram of the amplification unit in the pre-amplification module of the multi-mode vector hydrophone of the present invention;

[0034] Figure 3 is the circuit schematic diagram of the constant current source unit in the pre-amplification module of the multi-mode vector hydrophone of the present invention;

[0035] Figure 4 is the circuit schematic diagram of the filtering unit in the pre-amplification module of the multi-mode vector hydrophone of the present invention;

[0036] Figure 5 is the circuit schematic diagram of the programming and configuration unit in the pre-amplification module of the multi-mode vector hydrophone of the present invention;

[0037] Figure 6 is the circuit schematic diagram of the post-stage drive unit in the pre-amplification module of the multi-mode vector hydrophone of the present invention. Detailed implementation manners

[0038] The following further describes the present invention in detail with reference to the drawings and embodiments.

[0039] Embodiment 1:

[0040] This embodiment provides a preamplification module for a multi-mode vector hydrophone, which can provide three different working modes through pin programming to adapt to three main types of vector hydrophones: accelerometer co-vibration mode vector hydrophones, velocimeter co-vibration mode vector hydrophones, and differential pressure vector hydrophones, effectively reducing the integration difficulty of hybrid vector array devices and improving the maintainability of the devices.

[0041] As Figure 1 shown, the preamplification module for the multi-mode vector hydrophone includes: an amplification unit, a constant current source unit, a filtering unit, a programming configuration unit, and a post-stage driving unit, which can switch the circuit units participating in signal processing inside through the programming configuration unit to adapt to the front-end vector hydrophone and achieve their matching. Here, "programming configuration" refers to the selection of different hardware circuits to match the front-end hydrophone.

[0042] Among them, the vector hydrophone outputs a signal to the amplification unit (this signal is the input signal of the preamplifier for the multi-mode vector hydrophone), and the amplification unit is used to amplify the weak signal output by the vector hydrophone and perform functions such as impedance transformation.

[0043] The output terminal of the constant current source unit is connected between the vector hydrophone and the amplification unit, and is used to provide an excitation source for the vibration velocity channel of the vector hydrophone.

[0044] The amplification unit outputs the amplified signal to the filtering unit, and the filtering unit is used to allow the signals that meet the device frequency requirements to pass through while suppressing other frequency signals, thereby achieving noise removal and selecting the target signal.

[0045] The filtering unit outputs a signal to the programming configuration unit, and the programming configuration unit selects different circuit units by switching the circuit units participating in signal processing inside, so as to adapt to the signal output by the front-end vector hydrophone and make the two match.

[0046] As an example, three circuit units are configured in the programming configuration unit, which are respectively used to adapt to accelerometer co-vibration mode vector hydrophones, velocimeter co-vibration mode vector hydrophones, and differential pressure vector hydrophones; thus, the circuit unit matching the input signal of the front-end vector hydrophone (that is, the signal output by the vector hydrophone to the amplification unit) can be configured through pin programming.

[0047] The programming configuration unit outputs a signal to the post-stage driving unit, and the post-stage driving unit is used to increase the driving ability to greatly reduce the interference and loss of signal transmission and ensure the high-fidelity transmission of the signal in the case of long cables, etc.

[0048] Embodiment 2:

[0049] Next, the amplification unit, the constant current source unit, the filtering unit, the programming configuration unit, and the post-stage driving unit will be introduced in detail respectively.

[0050] The main function of the amplification unit is to amplify and perform impedance transformation on the weak electrical signals generated by the vector hydrophone at the proximal end without cable transmission loss. Considering that the ceramic hydrophone is a capacitive device, the preamplifier circuit of the general hydrophone is required to have a high input impedance. At the same time, the noise level of the receiving circuit mainly depends on the noise level of the preamplifier circuit. Therefore, the noise design of the preamplifier circuit is extremely important.

[0051] As Figure 1 shown, the amplification unit includes: an instrumentation amplifier K1 and its peripheral configuration circuit. As an example, the instrumentation amplifier K1 is a low-noise and high-precision instrumentation amplifier AD8421ARZ (differential amplifier), which has characteristics such as high common-mode rejection ratio, high input impedance, low noise, low linear error, and low offset drift, and also has a large bandwidth and excellent dynamic range response. Moreover, it has an excellent input current limiting protection function to protect the chip from being damaged under high-voltage input.

[0052] The instrumentation amplifier K1 has 8 pins, namely two gain setting pins R G ( Figure 1 pins 2 and 3 in Figure 1 ), the positive input pin +IN ( Figure 1 pin 4 in Figure 1 ), the negative input pin -IN ( OUT ( Figure 1 pin 1 in Figure 1 ), the reference voltage pin REF ( Figure 1 pin 6 in

[0053] ), the output pin V OUT ( Figure 1 pin 7 in Figure 1 ), the positive power supply pin +VS ( Figure 1 pin 8 in

[0053] ) and the negative power supply pin -VS ( Figure 1 pin 5 in

[0053] ).

[0054] The above capacitor C1, capacitor C2, resistor R1, and resistor R2 form an impedance matching circuit, which is used to match between the signal acquisition circuit and the subsequent conditioning circuit, enabling the subsequent conditioning circuit to obtain the maximum input voltage. This solution mainly receives weak voltage signals and is a voltage-driven circuit. At this time, the larger the input impedance, the more complete the signal flow to the subsequent stage, and a signal containing more complete information can be obtained. The hold-down R3 is a gain adjustment resistor, and different gains can be matched according to needs. Capacitor C3 and capacitor C4 are power supply bypass capacitors, which have a small impedance to high frequencies and can bypass high-frequency noise to the ground, providing a stable DC voltage for the circuit.

[0055] The constant current source unit uses a high-precision voltage regulator and a regulating resistor. As an example, the constant current source unit selects a three-terminal adjustable voltage regulator integrated chip, which has multiple protection circuits such as overload protection and safety zone protection, and can effectively protect the load; it also has characteristics such as a wide voltage regulation range, good voltage stabilization performance, and low noise. A constant current source is formed by a high-precision voltage regulator and a regulating resistor to provide an excitation source for the vibration velocity channel of the vector hydrophone.

[0056] As an example, as Figure 2 shown, the constant current source unit includes: a constant current source voltage regulator chip TA1, implemented by selecting LM317, which is a variable voltage regulator with three pins, namely the input terminal Vin ( Figure 2 pin 3 in Figure 2 ), the output terminal Vout ( Figure 2 pin 2 in ), and the adjustment terminal ADJ (

[0057] pin 1 in ); among them, the input terminal is connected to the input voltage, the output terminal is connected to the load (i.e., the vector hydrophone) to provide a stable output current, that is, the output terminal of the constant current source unit is connected between the output terminal of the vector hydrophone and capacitor C1 or capacitor C2 in the above amplification unit. When the amplification unit uses differential input, a constant current source unit is set at the front end of each of its positive input pin and negative input pin; an external resistor R11 is set between the adjustment terminal and the output terminal, and the adjustment terminal is used to adjust the magnitude of the output current through the external resistor R11, so as to provide the current required for the operation of the preamplifier inside the hydrophone. C13 is the power supply bypass capacitor of the constant current source unit, which has a small impedance to high frequencies and can bypass high-frequency noise to the ground, providing a stable DC voltage for the constant current source unit.

[0058] Figure 3

[0059] As an example, the high-pass filter chip K1A and the low-pass filter chip K1B use the low-noise and low-power rail-to-rail operational amplifier ADA4622-2ARZ, which has rail-to-rail output, high input impedance, and high load driving ability. It can drive a capacitive load of 350 pF and can provide at least 15 mA of current output ability. The operating frequency band is 200 Hz to 3 kHz, and technical requirements such as small in-band amplitude fluctuations and good phase-amplitude consistency can be achieved.

[0060] For convenience of description, let the operational amplifier used in the high-pass filter chip K1A be operational amplifier A, and the operational amplifier used in the low-pass filter chip K1B be operational amplifier B; the capacitor C5, capacitor C6, resistor R6, and resistor R7 form a high-pass filter series-parallel network; one end of the capacitor C5 is connected to the output of the amplification unit, and the other end is connected in series with the capacitor C6 and then connected to the positive input pin of the operational amplifier A. One end of the resistor R6 is connected to the negative input pin of the operational amplifier A, and the other end is connected between the capacitor C5 and the capacitor C6. One end of the resistor R7 is grounded, and the other end is connected to the positive input pin of the operational amplifier A; the required high-pass filtering characteristics can be obtained by reasonably selecting the resistor and capacitor values; the capacitors C7 and C8 are power supply bypass capacitors of the operational amplifier A, with low impedance to high frequencies, and can bypass high-frequency noise to the ground to provide a stable DC voltage.

[0061] The resistor R8, resistor R9, capacitor C9, and capacitor C10 form a low-pass filter series-parallel network. One end of the resistor R8 is connected to the output pin of the operational amplifier A, and the other end is connected in series with the resistor R9 and then connected to the positive input pin of the operational amplifier B; one end of the capacitor C9 is connected between the resistor R8 and the resistor R9, and the other end is connected to the negative input pin of the operational amplifier B; one end of the capacitor C10 is grounded, and the other end is connected to the positive input pin of the operational amplifier B; the required low-pass filtering characteristics can be obtained by reasonably selecting the resistor and capacitor values.

[0062] The programming configuration unit is provided with different circuit units, and can select a matching circuit unit through pin programming according to the different forms of the input signal of the front-end vector hydrophone.

[0063] As Figure 4 shown, the programming control unit includes: a programming configuration chip K1 and a programming configuration chip K2; both the programming configuration chip K1 and the programming configuration chip K2 use the INA105 differential amplifier, which can not only effectively amplify AC signals, but also effectively reduce the zero drift caused by power supply fluctuations and transistor temperature changes. It has a high common-mode rejection ratio and open-loop gain, forms a symmetric balanced structure, can obtain a high input impedance, effectively suppress the input common-mode signal, reduce common-mode interference, reduce the attenuation of the input weak signal, and can cancel the output error voltage generated by offset and temperature drift, etc.

[0064] For convenience of description, let the differential amplifier adopted by the programming configuration chip K1 be differential amplifier A, and the differential amplifier adopted by the programming configuration chip K2 be differential amplifier B; one end of the resistor R1 serves as the first input interface, and the other end is connected to the negative input pin of the differential amplifier A; one end of the resistor R2 is connected to the positive input pin of the differential amplifier A; the capacitors C1 and C2 are the power supply bypass capacitors of the differential amplifier A (that is, one end of the capacitor C1 is grounded and the other end is connected to the negative power supply pin of the differential amplifier A, one end of the capacitor C2 is grounded and the other end is connected to the positive power supply pin of the differential amplifier A), the reference voltage pin (REF) of the differential amplifier A is grounded, and the detection pin (Sense) of the differential amplifier A is connected to its output pin.

[0065] The negative input pin of the differential amplifier B is grounded, one end of the resistor R4 serves as the second input interface, and the other end is connected to the positive input pin of the differential amplifier B; at the same time, the other end of the resistor R2 is connected to the second input interface; one end of the resistor R3 is connected to the first input interface, and the other end is connected to the reference voltage pin (REF) of the differential amplifier B; the capacitors C3 and C4 are the power supply bypass capacitors of the differential amplifier B (that is, one end of the capacitor C3 is grounded and the other end is connected to the negative power supply pin of the differential amplifier B, one end of the capacitor C4 is grounded and the other end is connected to the positive power supply pin of the differential amplifier B); the detection pin (Sense) of the differential amplifier B is connected to its output pin.

[0066] The output pins of the differential amplifier A and the differential amplifier B are connected together and jointly serve as the output of the programming control unit.

[0067] In the above circuit structure, by setting the reference REF terminal as a non-inverting and inverting amplifier, the peripheral resistors R1 to R4 are configuration parameter configuration resistors. By changing their resistance values, the gain and output signal form can be adjusted. According to needs, vector signals X, Y, Z signals and scalar P signals can be generated, and it can be applied to three types of accelerometer co-vibration mode vector hydrophones, velocimeter co-vibration mode vector hydrophones, and differential pressure type vector hydrophones (when in use, according to the required vector hydrophone to be adapted, relevant parameters are configured), realizing the programming configuration of adapting three signal forms and sending them to the subsequent drive unit. The capacitors C1 to C4 are power supply bypass capacitors, with low impedance to high frequencies, which can bypass high-frequency noise to the ground and provide a stable DC voltage for the circuit.

[0068] When the output of the filtering unit is connected to the first input interface of the programming control unit, the first working mode is formed, and the circuit participating in signal processing at this time is the first circuit unit; when the output of the filtering unit is connected to the second input interface of the programming control unit, the second working mode is formed, and the circuit participating in signal processing at this time is the second circuit unit; when the output of the filtering unit is connected to the first input interface and the second input interface respectively, the third working mode is formed, and the circuit participating in signal processing at this time is the third circuit unit.

[0069] Thus, through different connection relationships between the filtering unit and the programming control unit, the programming control unit can provide three different working modes to adapt to different types of vector hydrophones.

[0070] The principle of the post-stage driving unit is to use negative feedback to achieve the matching between the output voltage and the input voltage. As Figure 5 shown, the post-stage driving unit includes an amplifier and a feedback circuit (i.e., the output of the amplifier is connected to its negative input to form negative feedback), compares the output signal with the input signal, and feeds back their difference to the input end of the amplifier through the feedback circuit to maintain the stability of the output voltage.

[0071] As an example, as Figure 6 shown, the post-stage driving unit includes: a driving chip K1A. As an example, the driving chip K1A selects the ADA4622-2 operational amplifier; this operational amplifier can be used as a buffer stage and an isolation stage as a voltage follower. The input end of the driving chip K1A is the signal after the programming configuration unit. Therefore, the driving chip generally requires a high slew rate and gain-bandwidth product. At the same time, in order to improve the subsequent driving ability, the driving chip also needs to have a high output current; its input impedance is very high, equivalent to an open circuit for the previous-stage circuit; and its output impedance is very low, equivalent to a constant voltage source for the subsequent-stage circuit, increasing the driving ability of the circuit, and the output voltage is not affected by the subsequent-stage impedance, that is, it realizes that the previous-stage and subsequent-stage circuits do not affect each other, playing the role of isolation and improving the driving ability. Capacitors C1 and C2 are power bypass capacitors of the driving chip K1A, with a small high-frequency impedance, which can bypass high-frequency noise to the ground and provide a stable DC voltage for the circuit.

[0072] Although the present invention has been described in detail with general descriptions and specific embodiments above, based on the present invention, some modifications or improvements can be made, which are obvious to those skilled in the art. Therefore, these modifications or improvements made without departing from the spirit of the present invention all fall within the scope of protection required by the present invention.

Claims

1. A multi-mode vector hydrophone preamplifier module, characterized in that: include: Amplification unit, constant current source unit, filtering unit and programming configuration unit; The amplification unit is used to amplify the signal output by the vector hydrophone and to perform impedance transformation; The constant current source unit is used to provide an excitation source for the vibration velocity channel of the vector hydrophone; The amplifying unit outputs the amplified signal to the filtering unit for filtering to select the target signal; The filtering unit outputs a signal to a programming configuration unit, wherein a plurality of different circuit units are configured in the programming configuration unit, respectively used to adapt different types of vector hydrophones; the programming configuration unit adapts the signal output by the front-end vector hydrophone by switching the internal circuit units involved in signal processing.

2. The multi-mode vector hydrophone preamplifier module according to claim 1, characterized in that: It also includes a post-stage driving unit, the programming configuration unit outputs a signal to the post-stage driving unit, and the post-stage driving unit is used to increase the driving capability and reduce the interference and loss of signal transmission.

3. The multi-mode vector hydrophone preamplifier module according to claim 1 or 2, characterized in that: The programming configuration unit is configured with three circuit units, which are respectively used to adapt the accelerometer isochronous type vector hydrophone, the velocity meter isochronous type vector hydrophone and the pressure difference vector hydrophone.

4. The multi-mode vector hydrophone preamplifier module according to claim 3, characterized in that: The programming control unit includes: a programming configuration chip K1 and a programming configuration chip K2; The programming configuration chip K1 adopts a differential amplifier A, and the programming configuration chip K2 adopts a differential amplifier B; One end of the resistor R1 is used as the first input interface, and the other end is connected to the negative input pin of the differential amplifier A; one end of the resistor R2 is connected to the positive input pin of the differential amplifier A; capacitors C1 and C2 are power supply bypass capacitors of the differential amplifier A; the reference voltage pin of the differential amplifier A is grounded, and the detection pin is connected to its output pin; The negative input pin of the differential amplifier B is grounded, one end of the resistor R4 is used as the second input interface, and the other end is connected to the positive input pin of the differential amplifier B; at the same time, the other end of the resistor R2 is connected to the second input interface; one end of the resistor R3 is connected to the first input interface, and the other end is connected to the reference voltage pin of the differential amplifier B; capacitors C3 and C4 are power supply bypass capacitors of the differential amplifier B; the detection pin of the differential amplifier B is connected to its output pin; The output pins of the differential amplifier A and the differential amplifier B are connected and serve together as the output of the programming control unit; When the output of the filtering unit is connected to the first input interface of the programming control unit, a first working mode is formed, and the circuit participating in signal processing is the first circuit unit; when the output of the filtering unit is connected to the second input interface of the programming control unit, a second working mode is formed, and the circuit participating in signal processing is the second circuit unit; when the output of the filtering unit is respectively connected to the first input interface and the second input interface, a third working mode is formed, and the circuit participating in signal processing is the third circuit unit.

5. The multi-mode vector hydrophone preamplifier module according to claim 1 or 2, characterized in that: The amplification unit includes: an instrument amplifier K1 and a peripheral configuration circuit; The peripheral configuration circuit includes: a gain adjustment resistor R3 connected between two gain setting pins of the instrument amplifier K1, a capacitor C1 connected to the negative input pin of the instrument amplifier K1, a capacitor C2 connected to the positive input pin of the instrument amplifier K1, a resistor R1 with one end grounded and the other end connected between the capacitor C1 and the negative input pin of the instrument amplifier K1, a resistor R2 with one end grounded and the other end connected between the capacitor C2 and the positive input pin of the instrument amplifier K1, a capacitor C3 with one end grounded and the other end connected to the positive power supply pin +VS, and a capacitor C4 with one end grounded and the other end connected to the negative power supply pin.

6. The multi-mode vector hydrophone preamplifier module according to claim 1 or 2, characterized in that: The constant current source unit adopts a high-precision voltage-stabilizing source and an adjusting resistor to provide a stable output current.

7. The multi-mode vector hydrophone preamplifier module according to claim 1 or 2, characterized in that: The filtering unit comprises a high-pass filter and a low-pass filter cascaded in series; The high-pass filter chip K1A and the low-pass filter chip K1B both use operational amplifiers, which are operational amplifier A and operational amplifier B respectively; One end of capacitor C5 is connected to the output of the amplification unit, and the other end is connected in series with capacitor C6 and then connected to the positive input pin of operational amplifier A. One end of resistor R6 is connected to the negative input pin of operational amplifier A, and the other end is connected between capacitor C5 and capacitor C6. One end of resistor R7 is grounded, and the other end is connected to the positive input pin of operational amplifier A. Capacitor C7 and capacitor C8 are power supply bypass capacitors of operational amplifier A. One end of the resistor R8 is connected to the output pin of the operational amplifier A, and the other end is connected in series with the resistor R9 and then connected to the positive input pin of the operational amplifier B; one end of the capacitor C9 is connected between the resistor R8 and the resistor R9, and the other end is connected to the negative input pin of the operational amplifier B; one end of the capacitor C10 is grounded, and the other end is connected to the positive input pin of the operational amplifier B.

8. The multi-mode vector hydrophone preamplifier module according to claim 2, characterized in that: The post-stage driving unit uses negative feedback to achieve matching between the output voltage and the input voltage.

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