KR0126907Y1 - Temperature sensor interface circuit of sensor part of linear array acoustic wave detector - Google Patents

Abstract

The present invention relates to the temperature sensor interface circuit of the line array sonar sensor for accurately detecting the underwater temperature detected by the temperature sensor of the low frequency acoustic modules of the array sonar and transmitting it to the signal processor on the line, the low frequency sound of the line array sonar In the circuit for transmitting the temperature of the water sensed by the temperature sensor 37 of the module to the signal processing unit on the line, the constant voltage generator 37-1 for generating a constant voltage and the constant voltage generator 37-1 An amplification unit 37-2 for amplifying by adjusting the constant voltage to a predetermined level in the same manner as the signal applied from the temperature sensor 37, and removing noise for the signal amplified by the amplifying unit 37-2. Low-pass filter 37-3 for passing only a signal of the DC component, and a V / I converter 37- converting and outputting a voltage for the signal of the DC component passing through the low-pass filter 37-3 to current. 4) equipped with seniors To accurately detect the temperature of the water detected by the temperature sensor of the low frequency sonar, acoustic module is capable of transmitting a signal processing unit of the line.

Description

Temperature sensor interface circuit of line array sonar sensor

1 is an exemplary view schematically showing a sensor unit of a line array sonar.

2 is a block diagram showing the configuration of a line array sonar.

3 is a block diagram showing a temperature sensor interface circuit for solving the present invention.

4 is a detailed circuit diagram of FIG.

* Explanation of symbols for main parts of the drawings

10: tail rope assembly 20: array stabilization module

21: direction sensor 22: depth sensor

30: low frequency acoustic module 31, 32: roll sensor

33: hydrophone 34: shear amplifier

35: seawater noise compensation circuit 36: protection circuit

37: temperature sensor 37-1: constant voltage generator

37-2: Amplification part 37-3: Low pass filter (LEP)

37-4: V / I converter 40: signal transmission module

41: depth sensor 42: analog multiplexer

43: automatic gain adjustment amplifier 44: A / D converter

45: direction sensor 50: high frequency sound module

51: hydrophone 52: shear amplifier

53: seawater noise compensation circuit 54: protection circuit

60: vibration isolation module 61: buffer

62: tension 63: fine vibration buffer

64: fine vibration tension 65,66: acceleration sensor

70: towing cable

The present invention relates to a sensor unit of a linear array sonar that is connected to a ship or offshore structure by a tugboat and can target a 360 ° omnidirectional target, and in particular, accurately detects the underwater temperature detected by the temperature sensor of the linear array sonar low frequency acoustic module. The present invention relates to a temperature sensor interface circuit of a line array sonar sensor unit for detecting and transmitting the signal to a signal processing unit on a line.

In general, the way the sensor unit of the line array sonar detects the acoustic signal in the water is largely as shown in FIG. 1, the tail rope assembly 10 to finally attenuate the vibration, and the effect of noise due to the slight vibration An array stabilization module 20 for excluding the signal, a low frequency acoustic module 30 for receiving low frequency sound waves, a signal transmission module 40 for converting an input analog signal into a digital signal, and receiving a high frequency sound wave signal High frequency acoustic module 50, a vibration isolating module 60 to damp the vibration, and a towing cable 70 for connecting the line array sonar to the vessel or offshore structure.

The low frequency acoustic module 30 includes a low frequency hydrophone 33 for receiving sound of low frequency underwater, a low frequency shear amplifier 34 for amplifying an electric signal at an output terminal of the low frequency hydrophone 33, and a low frequency The seawater noise compensation circuit 35, which attenuates the noise component, is connected to a cascade.

The high frequency acoustic module 50 has the same configuration as that of the low frequency acoustic module 30, which amplifies an electric signal at the output of the high frequency hydrophone 51 and the high frequency hydrophone 51 for receiving high frequency of seawater. A high frequency shear amplifier 52 and a seawater noise compensation circuit 53 for amplifying high frequency signal components while attenuating noise of low frequency components are cascaded.

The signal transmission module 40 includes an analog multiplexer 42 for receiving analog output signals from the high frequency sound module 50 and the low frequency sound module 30, an automatic gain amplifier amplifier 43 for amplifying the signal, and an analog signal. The A / D converter 44 converts the digital signal into a digital signal, the orientation sensor 45 detecting the towing direction, and the depth sensor 41 detecting the water depth.

The vibration isolation module 60 includes a buffer 61 for buffering vibration, a tension 62 for damping vibrations, and a fine vibration buffer 63 for removing residual vibration components that are not removed from the tension 62, and fine vibrations. And a tension 64 and acceleration sensors 65 and 66.

The array stabilization module 20 is a module having a function of stabilizing the array by transmitting the vibration not attenuated from the vibration isolation module 60 to the depth sensor 22 for detecting the depth and the orientation sensor for detecting the towing direction ( 21).

In addition to the above arrangement, it consists of a tail rope assembly 10 which finally attenuates residual vibration.

The operation of the line array sonar sensor unit configured as described above will be described with reference to FIG.

The low frequency acoustic module 30 is a module for converting a low frequency signal among the received acoustic signals into an electrical signal. The vibration propagated by the mechanical small and tight action of seawater particles is directly proportional to the product of the square of frequency and amplitude. It causes a change in output to the low-frequency hydrophone 33 in size.

As a result, the piezoelectric element of the low frequency hydrophone 33 generates an electric signal at the output terminal.

The electrical signal induced above shows the effect of signal amplification and noise cancellation in the low frequency shear amplifier 34 at the rear stage.

Low frequency, that is, a signal in which most of the energy exists in the low frequency region, such as sound waves, does not cause a large frequency deviation due to the high frequency components of the same magnitude.

Therefore, the energy of the signal is not uniformly distributed over the allocated bandwidth, but the energy of the high frequency portion is less distributed, resulting in a very low signal to noise ratio (S / N) for the high frequency signal.

Pre-Emphasis and De-Emphasis methods to improve this weakness can be suppressed to a certain level with high signal level in the transmitter and noise can be suppressed by extending the high frequency compared to the low frequency Intentionally changing, the signal level is high in the receiver and the noise can be suppressed to some extent, so the signal to be demodulated should be intentionally changed by extending the low frequency compared to the high frequency.

The alteration of the signal to generate high frequency spreading is called pre-emphasis filtering, and the expansion of low frequency components as compared to high frequency is called de-emphasis.

This increases the signal-to-noise ratio (S / N) at the receiving end.

The pre-emphasis and the de-emphasis are collectively referred to as emphasis.

In the low frequency shear amplifier 34, the small signal of the hydrophone 33 is amplified to a size suitable for signal processing.

In general, underwater sound waves are often present in the form of low frequency waves, so that a plurality of low frequency acoustic modules 30 are installed in the sensor unit of the line array sonar for accurate measurement of signals, so that low frequency signals of seawater can be captured. .

Since the noise is also amplified together in the signal, there are not only ambient noise but also the noise factor of the amplifier itself (1 / f noise, shot noise, and Johnson noise generated in the low pass filter frequency band).

1 / f noise occurs in the low pass band, Johnson noise, shot noise appears in the frequency band (Frequency Modulation: FM) band and evenly distributed in the frequency band, considering the elimination of the amplification circuit (microscopic) By limiting the bandwidth, the noise level is reduced.

In addition to the low frequency acoustic module 30, the operation of the high frequency acoustic module 50 for detecting the high frequency sound wave signal of the seawater is the same as the above method.

Next, in the signal transmission module 40, the acoustic module modulates the high frequency acoustic module 50 signal and the low frequency acoustic module 30 signal in the current form, and modulates the pulse code to digitalize the data. Pulse Code Modulation (PCM).

The pulse code modulation (PCM) is a method of transmitting a signal in sequence of numbers, and sampling and quantizing the signal according to the size and quantizing and leveling the sampled signal. Used.

Looking at the operation of the signal transmission module 40 of the towed line array sonar sensor through Figure 2 as follows.

When the signals received and amplified by the high frequency sound module 50 and the low frequency sound module 30 are sequentially input to the analog multiplexer 42 to digitally signal, the analog multiplexer 42 automatically gains the received signals sequentially. After the amplitude is amplified by the adjusting amplifier 43, the analog signal in the A / D converter 44 is sampled, quantized, and digitally signaled to a corresponding magnitude according to the magnitude of the amplitude.

Here, the analog signal is sampled and quantized into a corresponding digital signal according to its magnitude, and then digitally signaled.

In addition, the azimuth sensor 45 captures the towing direction, and the depth sensor 41 measures the depth information, respectively, and modulates the pulse code like a sound signal processing route in the signal transmission module 40 so that the digital signal is generated. As described above, the ship is transmitted to the signal processor (not shown).

Next, the vibration isolation module 60 is to attenuate the vibration generated from the towing and the towing cable 120. The vibration is detected by the tension 62 and the micro vibration tension 64 to generate a buffer ( 61) and the vibration damping in the fine vibration buffer 64, each acceleration sensor 65, 66 detects the acceleration during the sensor operation.

In addition, the tail rope assembly 10 stabilizes the arrangement by transmitting the vibrations that are not attenuated in the vibration module of the array stabilization module 20 through the tail rope assembly 10, and finally, the sensor part of the line array sonar finally remains. Prevent vibration

The towed line array sonar sensor unit can collect various data information about the depth of water, azimuth, etc., and can remove noise effect caused by the medium by separating low frequency and high frequency for high quality signal processing of collected information. In other words, defects indicating limitations have arisen in the area of precision detection and detection of large area exploration remote signals.

The present invention provides high-quality signal discrimination and ease of installation in fields requiring the sophistication of remote sensing 360 ° omnidirectional signal identification, and the temperature sensor of the line array sonar low frequency acoustic module to realize high speed signal detection. It is an object of the present invention to provide an interface circuit that accurately detects the temperature of the water sensed by and transmits it to a signal processor on board.

In the present invention, in the circuit for transmitting the temperature of the water sensed by the temperature sensor 37 of the line array sonar low frequency acoustic module to the signal processor on the line, the constant voltage generating means for generating a reference voltage by the constant voltage generator and the constant voltage generation Amplifying means for amplifying by adjusting the constant voltage generated by the means to a constant level in the same manner as the signal applied from the temperature sensor 37, and removes the noise of the signal amplified by the amplifying means to pass only the signal of the DC component It is a well-known feature to provide an interface circuit having a noise canceling means for converting a voltage and a voltage / current converting means for converting a voltage of a signal of a DC component passed through the noise removing means into a current.

This will be described with reference to the accompanying drawings.

In the circuit for transmitting the temperature of the water detected by the temperature sensor 37 of the line array sonar low frequency acoustic module to the signal processor on the line,

Amplification by amplifying by adjusting a constant voltage generator 37-1 for generating a constant voltage and a constant voltage generated by the constant voltage generator 37-1 to a predetermined level in the same manner as the signal applied from the temperature sensor 37 A low-pass filter 37-3 which removes noise with respect to the signal amplified by the amplifying unit 37-2 and passes only a signal of a DC component, and the low-pass filter 37-3. And a V / I converter 37-4 for converting the voltage of the DC component signal passed through the current into a current.

The constant voltage generator 37-1 includes a constant voltage generator for generating a constant voltage and a resistor R2 for reducing an offset voltage of a current output from the constant voltage generator.

The amplifying unit 37-2 adjusts the current value input from the constant voltage generating unit 37-1 and the variable resistor VR1 and the current value of the temperature sensor 37 and the variable resistor VR1. An amplifier OP1 for amplifying the current value to a predetermined level, a resistor R1 for determining the amplification degree of the amplifier OP1, and a variable resistor VR2.

The low pass filter 37-3 includes a resistor R4 and a condenser C3 that determine a value for removing the noise of the signal amplified by the amplifier OP1 and passing only the DC component signal.

The V / I converter 37-4 includes an amplifier OP2 for amplifying the signal input from the low pass filter 37-3 to a predetermined level, and a resistor R5 for determining an amplification ratio of the amplifier OP2. And a capacitor C4, an amplifier OP3 which amplifies and outputs the output signal of the amplifier OP2 and outputs it through the resistors R10 and R9, and a resistor that divides a signal input to the amplifier OP3. (R6) (R7) and a resistor (R3) for keeping the output signal of the amplifier (OP2) constant and outputting it to the output (out put).

Hereinafter, by the accompanying drawings will be described the operation and effect according to the present invention.

FIG. 1 is an exemplary view schematically showing a sensor unit of a line array sonar, FIG. 2 is a block diagram showing a configuration of a line array sonar, and FIG. 3 is a block diagram showing a temperature sensor interface circuit for solving the present invention. 4 is a detailed circuit diagram of FIG.

Since the sensor part of the line array sonar has already been described in the preceding section of the present invention, the effects of the present invention will be omitted.

The operation of the signal transmission module 40 of the towed line array sonar sensor unit will be briefly described with reference to FIG. 2.

When the signals received and amplified by the high frequency sound module 50 and the low frequency sound module 30 are sequentially input to the analog multiplexer 42 to digitally signal, the analog multiplexer 42 is input to the analog multiplexer 42. After the amplitude of the received signal is sequentially amplified by the automatic gain adjustment amplifier 43, the analog signal in the A / D converter 44 is sampled, quantized, and digitally signaled to a corresponding magnitude according to the magnitude of the amplitude.

At this time, the analog signal is sampled and quantized into a corresponding digital signal according to its magnitude, and then converted into a digital signal.

In addition, the azimuth sensor 45 captures the towing direction, and the depth sensor 41 measures the depth information, respectively, and pulse code modulates (PCM) the digital signal such as a sound signal processing route in the signal transmission module 40. Then, the sound signal is transmitted to the ship signal processor (not shown).

Then, the vibration isolation module 60 is to attenuate the vibration generated from the towing and the towing cable 120, by detecting the vibration caused by the towing by the tension 62 and the fine vibration tenshan 64 buffer ( 61) and the vibration damping in the fine vibration buffer 64, each acceleration sensor 65, 66 detects the acceleration during the sensor operation.

In addition, the tail rope assembly 10 is a vibration that is not attenuated by the vibration module of the array stabilization module 20 is transmitted through the tail rope assembly 10 to stabilize the arrangement to finally residual vibration of the sensor portion of the line array sonar To prevent.

Looking at the temperature sensor (450) to detect the temperature of the water to be treated as the main point in the present invention based on the third to fourth of the present invention as follows.

Underwater temperature detected by the temperature sensor 37 is output as a signal of the current is input to the inverting terminal (-) of the amplifier (OP1) of the amplifier 37-2.

The signal sensed by the temperature sensor 37 is input to the inverting terminal (-) of the amplifier OP1 of the amplifier 37-2 and the constant voltage generated by the constant voltage generator of the constant voltage generator 37-1 is a resistor ( The offset voltage is reduced via R2) and input to the inverting terminal (-) of the amplifier OP1 of the amplifier 37-2 through the variable resistor VR1.

At this time, adjust the variable resistance VR1 to be the same as the value input from the temperature sensor 37 (ex: 273㎂) to change the current value of the inverting terminal (-) of the amplifier OP1 to a certain level (for example, 0V). To be.

Therefore, if the current value input from the temperature sensor 37 inputted by the amplifier OP1 at 0V and the current value input from the constant voltage generator 37-1 are equal to each other, the resistance R1 and the variable resistor R1 and The amplification degree is determined by the adjustment value of the variable resistor VR2, and amplified to a predetermined level (for example, 100㎂ 1 ° C) and output.

The signal output from the amplifier OP1 of the amplifier 37-2 removes the noise of the signal amplified at the front end through the resistor R4 and the condenser C3 of the low pass filter 37-3. The signal of the component, i.e., a voltage, is passed through the V / I converter 37-4 and the non-inverting terminal (+) of the amplifier OP2.

The voltage input to the non-inverting terminal (+) of the amplifier (OP2) as a DC component has an amplification factor (eg: 10 times) by the values of the resistor R5 and the capacitor C4 already connected to the inverting terminal (-). The voltage inputted is amplified by 10 times and output as a current value.

Since the signal amplified and output from the amplifier OP2 is divided through the resistors R6 and R7 at the time when it is applied to the resistor R3 and input to the amplifier OP3, the amplifier OP3 amplifies it. Return to amplifier OP2.

Therefore, the signal amplified by the amplifier OP2 and output as a current value is output through the resistors R10 and R9 so that the voltage across the resistor R8 is kept constant at all times so that the signal sensed by the temperature sensor 37 is on-line. Correctly transmit to the signal processing unit.

As described above, the present invention provides high-quality signal discrimination and ease of installation in the field requiring the sophistication of the remote sensing 360 ° omnidirectional signal identification, and the array array sonar low frequency sound to realize high speed signal detection. It can accurately detect the underwater temperature detected by the temperature sensor of the module and transmit it to the signal processor on board.

Claims (5)

In the circuit for transmitting the temperature of the water sensed by the temperature sensor 37 of the line array sonar low frequency acoustic module to the signal processor on the line, a constant voltage generator 37-1 for generating a constant voltage, and the constant voltage generator ( An amplification unit 37-2 for amplifying by adjusting a constant voltage generated at 37-1 to a predetermined level in the same manner as a signal applied from the temperature sensor 37, and amplifying the amplification unit 37-2. A low pass filter 37-3 which removes noise of a signal and passes only a signal of a DC component, and V / which converts and outputs a voltage of a DC component signal passing through the low pass filter 37-3 into a current. A temperature sensor interface circuit of a line array sonar sensor section comprising an I converter section 37-4. The line array of claim 1, wherein the constant voltage generator 37-1 includes a constant voltage generator for generating a constant voltage, and a resistor R2 for reducing an offset voltage of a current output from the constant voltage generator. Temperature sensor interface circuit for sonar sensor. The variable amplifier VR1 of claim 1, wherein the amplifier 37-2 adjusts the current value input from the constant voltage generator 37-1, the current value and the variable resistor of the temperature sensor 37. An amplifier OP1 for amplifying the current value adjusted by VR1 to a predetermined level, a resistor R1 for determining the amplification degree of the amplifier OP1, and a variable resistor VR2. Temperature sensor interface circuit in the sensor section. The low pass filter 37-3 includes a resistor R4 and a capacitor C3 that determine a value for removing a noise of the signal amplified by the amplifier OP1 and allowing only a DC component signal to pass. Temperature sensor interface circuit of the line array sonar sensor. The V / I converter 37-4 further includes an amplifier OP2 for amplifying a signal input from the low pass filter 37-3 to a predetermined level, and an amplification ratio of the amplifier OP2. The resistor R5 and the capacitor C4 to be determined, the amplifier OP3 which amplifies and outputs the output signal of the amplifier OP2 and outputs it through the resistors R10 and R9, and is input to the amplifier OP3. And a resistor (R6) (R7) for dividing the signal, and a resistor (R3) for keeping the output signal of the amplifier (OP2) constant and outputting it to an output (out put). Temperature sensor interface circuit in the sensor section.