Signal transmitting device for hydrophone performance test

Abstract

The utility model discloses a signal transmitting device for hydrophone performance testing, and belongs to the technical field of hydrophone testing. Comprising a test cavity; the test cavity is of a sealed structure, and a hydrophone, a sound player and a pressure sensor are installed in the test cavity; the signal generator is used for generating sine wave signals or cosine wave signals; the power amplifier is used for receiving the sine wave signal or the cosine wave signal output by the signal generator and amplifying the signal; wherein an output terminal of the signal generator is connected with an input terminal of the power amplifier, and an output terminal of the power amplifier is connected with an input terminal of the sound player through a data line. The hydrophone sound signal transmitting device has the advantages that the hydrophone sound signal transmitting device is used for transmitting hydrophone sound signals so as to test the performance of a hydrophone under different frequencies, and therefore the hydrophone can be comprehensively evaluated.

Description

Technical Field

[0001] The utility model belongs to the technical field of hydrophone testing, and in particular relates to a signal transmitting device for hydrophone performance testing. Background Art

[0002] A hydrophone is a device that converts sound signals into electrical signals based on the propagation characteristics of sound waves in water, thereby receiving sound signals in water. Hydrophones are often used in oil exploration, and the performance of the hydrophone directly determines its ability to receive sound signals. High-quality hydrophones can capture sound signals more accurately, including weak sound signals, thereby providing more accurate data. The quality of the hydrophone can be judged based on whether the sensitivity and phase-frequency characteristics of the hydrophone at different frequencies are within a certain error range. However, the test equipment commonly used in oil exploration currently tests the sensitivity of the hydrophone at 170Hz, that is, the sensitivity test of one frequency point, and cannot comprehensively evaluate the overall performance of the hydrophone. Therefore, it is urgent to develop a device to solve the above problems. Utility Model Content

[0003] The utility model aims to meet practical needs and provide a signal transmitting device for testing the performance of a hydrophone, which is used for transmitting a hydrophone sound signal to test the performance of the hydrophone at different frequencies, thereby comprehensively evaluating the hydrophone.

[0004] To achieve the above-mentioned purpose of the utility model, the purpose of the utility model is to provide a signal transmitting device for testing the performance of a hydrophone, comprising a test cavity; the test cavity is a sealed structure, and a hydrophone, a sound player and a pressure sensor are installed in the test cavity; outside the test cavity are arranged: a signal generator for generating a sine wave signal or a cosine wave signal; a power amplifier for receiving the sine wave signal or the cosine wave signal output by the signal generator and amplifying the signal; wherein: the output terminal of the signal generator is connected to the input terminal of the power amplifier, and the output terminal of the power amplifier is connected to the input terminal of the sound player through a data line.

[0005] In the above scheme of the signal transmitting device for testing the performance of a hydrophone, the signal generator, the pressure sensor and the hydrophone are connected to a computer terminal.

[0006] In the above scheme of the signal transmitting device for hydrophone performance testing, the frequency range of the signal generator output is 8 Hz to 250 Hz.

[0007] In the scheme of the signal transmitting device for testing the performance of the hydrophone, a resistor with a resistance of 1000Ω is connected in series at both ends of the hydrophone.

[0008] In the above scheme of the signal transmitting device for hydrophone performance testing, the pressure sensor model is MPXV7002DP pressure sensor, and the power amplifier adopts OPA549 power amplifier.

[0009] The advantages and positive effects of this application are:

[0010] The present application designs a signal transmitting device for testing the performance of a hydrophone, which can emit a sound signal at a specific frequency through a signal generator, a power amplifier and a sound player, and the pressure sensor collects the pressure values ​​corresponding to the sinusoidal signal before and after the emission of the signal at different frequencies, calculates the pressure difference, and can also collect the output voltage value of the hydrophone to calculate the sensitivity and phase difference of the hydrophone, thereby comprehensively evaluating the overall performance of the hydrophone. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0012] Figure 1 The schematic diagram shows the structure of a signal transmitting device for testing the performance of a hydrophone provided by an embodiment of the utility model. DETAILED DESCRIPTION

[0013] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0014] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0015] All numerical designations, such as temperature, length, frequency, flow, including ranges, are approximate. It is to be understood, although not always expressly stated, that all numerical designations are preceded by the term "about".

[0016] For ease of explanation, relational terms such as “first” and “second” etc. are used in the embodiments merely to distinguish one component from another having the same name, but do not necessarily require or imply any such actual relationship or order between these components.

[0017] In the description of the invention of the utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the invention of the utility model can be understood according to specific circumstances.

[0018] See also Figure 1 ;

[0019] First embodiment

[0020] The utility model provides a signal transmitting device for testing the performance of a hydrophone, such as Figure 1 As shown, including the following:

[0021] Test cavity; the test cavity is a sealed structure, in which a hydrophone, a sound player and a pressure sensor are installed;

[0022] Arranged outside the test cavity are: a signal generator for generating a sine wave signal or a cosine wave signal; a power amplifier for receiving the sine wave signal or the cosine wave signal output by the signal generator and amplifying the signal;

[0023] Wherein: the output terminal of the signal generator is connected to the input terminal of the power amplifier, and the output terminal of the power amplifier is connected to the input terminal of the sound player through a data line.

[0024] The signal generator, pressure sensor and hydrophone are connected to the computer terminal to realize data exchange and perform data processing in the computer terminal. It should be noted that the connection between the signal generator, pressure sensor and hydrophone and the computer terminal needs to be equipped with an adapter, converter or other equipment in the middle according to the actual situation, or install appropriate drivers or software on the computer so as to read and process the data from the sensor, etc., and also facilitate the computer to send instructions to drive related equipment. Among them, the voltage amplitude of the hydrophone output signal can be obtained by the computer using the FFT algorithm.

[0025] For example, the data of the pressure sensor and the output signal information of the hydrophone can be collected by the data acquisition card, and then transmitted to the computer terminal for processing. The instructions of the computer terminal can also be transmitted to the signal generator through the data acquisition card to generate a signal of a specified frequency. The data acquisition card used here has 16 synchronous acquisition differential channels, 4 analog output channels, a sampling rate of up to 250kSa / s / ch, a resolution of up to 16bit, and can output a sinusoidal signal of 8-250Hz and an amplitude of 0.96V.

[0026] Specifically, the power amplifier can amplify the sinusoidal signal output by the signal generator to compress the air inside the test cavity. Exemplarily, the power amplifier can be an OPA549 power amplifier, and related circuits can be set so that the amplification factor is adjustable, such as a magnification factor of 3.

[0027] The pressure sensor may be a MPXV7002DP pressure sensor. The MPXV7002DP pressure sensor can convert physical pressure signals into corresponding electrical signal outputs. The core part of the MPXV7002DP pressure sensor module is a piezoresistive element based on a single crystal silicon wafer. When subjected to pressure, the silicon wafer will deform, thereby changing its resistance value. At the same time, the sensor can output a high-precision analog signal proportional to the pressure it is subjected to.

[0028] It should be noted that the signal generator needs to output a sinusoidal signal with a frequency range of 8 to 250 Hz and an amplitude of 0.96 V. Correspondingly, the measurement frequency range of the hydrophone is also 8 to 250 Hz, which can ensure that the hydrophone detects sound signals in a larger frequency range.

[0029] In summary, the signal generated by the signal generator is amplified by the power amplifier and transmitted to the sound player in the test cavity. The sound player converts the electrical signal into an acoustic signal for propagation in the test cavity. The hydrophone records or monitors the sound signal, and the pressure sensor can detect changes in the air pressure in the test cavity.

[0030] Second embodiment

[0031] Based on the content of the first embodiment, the working principle of this application is:

[0032] The signal sent by the computer terminal driving the signal generator is amplified and then sent out by the sound player with specific parameters, which compresses the air in the test cavity to different degrees.

[0033] Compression causes the pressure in the test chamber to change, and the changes in pressure before and after are collected to calculate the pressure difference.

[0034] It can be seen that for each frequency of the sinusoidal signal, such as 8Hz, 40Hz or 250Hz, the pressure sensor monitors the change of the pressure corresponding to the frequency, collects the output voltage amplitude value of the hydrophone, and sends the pressure difference and voltage amplitude value to the computer terminal, where the following calculation is performed:

[0035] 1. Calculate the sensitivity of the hydrophone based on the pressure difference and output voltage amplitude.

[0036] 2. Convert the voltage signals of the pressure difference value and the output voltage amplitude value into frequency domain signals, and calculate the phase difference between the frequency domain signal of the pressure difference value and the frequency domain signal of the output voltage amplitude value.

[0037] In summary, this device can be used to test the sensitivity and phase-frequency characteristics of the hydrophone at different frequencies, and then comprehensively evaluate the overall performance of the hydrophone.

[0038] It should be noted that before testing the hydrophone, the resistance of the hydrophone can be measured. Specifically, a resistor with a resistance of 1000Ω is connected in series at both ends of the hydrophone, and a 5V voltage is applied to both ends of the hydrophone using a voltage-stabilized power supply, and then the resistance of the hydrophone can be obtained according to Ohm's law and the voltage division principle of the series circuit.

[0039] Based on the above device, a sound signal at a specific frequency can be emitted through a signal generator, a power amplifier and a sound player, and the pressure sensor can collect the pressure values ​​corresponding to the sinusoidal signal before and after the emission of the signal at different frequencies to calculate the pressure difference. The output voltage value of the hydrophone can also be collected to calculate the sensitivity and phase difference of the hydrophone, thereby comprehensively evaluating the overall performance of the hydrophone.

[0040] The above is only a preferred embodiment of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A signal transmitting device for hydrophone performance testing, characterized in that: The invention comprises a test cavity; the test cavity is a sealed structure, a hydrophone, a sound player and a pressure sensor are installed in the test cavity; outside the test cavity are arranged: A signal generator for generating a sine wave signal or a cosine wave signal; A power amplifier for receiving the sine wave signal or cosine wave signal output by the signal generator and amplifying the signal; wherein: The output terminal of the signal generator is connected to the input terminal of the power amplifier, and the output terminal of the power amplifier is connected to the input terminal of the sound player through a data line.

2. The signal transmitting device for hydrophone performance testing according to claim 1, characterized in that: The signal generator, pressure sensor and hydrophone are connected to a computer terminal.

3. The signal transmitting device for hydrophone performance testing according to claim 1, characterized in that: The frequency range of the signal generator output is 8 Hz to 250 Hz.

4. The signal transmitting device for hydrophone performance testing according to claim 1, characterized in that: A resistor with a resistance of 1000Ω is connected in series at both ends of the hydrophone.

5. The signal transmitting device for hydrophone performance testing according to claim 1, characterized in that: The pressure sensor model is MPXV7002DP pressure sensor, and the power amplifier adopts OPA549 power amplifier.

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