Detection circuit and direct-reading ferrograph

Abstract

The embodiment of the utility model discloses a detection circuit and a direct-reading ferrograph. The detection circuit comprises a control module, a digital-to-analog conversion module is connected with the control module, and the digital-to-analog conversion module is used for converting a first control signal into a first analog signal and converting a third control signal into a second analog signal; the light emitting module is connected with the digital-to-analog conversion module and the control module, and the light emitting module is used for emitting light according to the first analog signal and the second control signal; the light sensing detection module directly faces the light emitting module, and the light sensing detection module is used for collecting at least one path of light sensing signal and generating at least one abrasive particle sensing signal according to the difference between the light sensing signal and the second analog signal; and the control module is used for determining the abrasive particle deposition amount according to the abrasive particle sensing signal corresponding to the detected initial illumination and the abrasive particle sensing signal corresponding to the detected current illumination, and outputting an abrasive particle concentration value according to the abrasive particle deposition amount. According to the technical scheme provided by the embodiment, the detection precision of the abrasive particles is improved.

Description

Technical Field

[0001] The embodiments of the utility model relate to the field of detection technology, and in particular to a detection circuit and a direct-reading ferroscope. Background Art

[0002] Ferrography uses high-intensity, high-gradient magnetic fields to separate ferromagnetic wear particles from oil, causing them to settle in an orderly fashion according to size, and then analyze and study them. Existing ferrography instruments are susceptible to interference from external signals when collecting and analyzing wear particles, resulting in poor detection accuracy.

[0003] The existing ferroscope is easily interfered by external signals when collecting and analyzing wear particles, and the problem of poor detection accuracy has become an urgent problem to be solved in the industry. Utility Model Content

[0004] The embodiments of the present invention provide a detection circuit and a direct-reading ferrogram to solve the problem that the existing ferrogram is easily interfered by external signals and has poor detection accuracy when performing wear particle collection and analysis.

[0005] In order to achieve the above technical problems, the present invention adopts the following technical solutions:

[0006] The present invention provides a detection circuit, comprising:

[0007] A control module, configured to output a first control signal, a second control signal, and a third control signal;

[0008] a digital-to-analog conversion module connected to the control module, the digital-to-analog conversion module being configured to convert the first control signal into a first analog signal and convert the third control signal into a second analog signal;

[0009] An optical transmission module, connected to the digital-to-analog conversion module and the control module, and configured to transmit an optical signal according to the first analog signal and the second control signal;

[0010] The optical sensing detection module is directly opposite to the optical emission module and is connected to the control module and the digital-to-analog conversion module. The optical sensing detection module is used to collect at least one optical sensing signal and generate at least one abrasive particle sensing signal based on the difference between the optical sensing signal and the second analog signal; the control module is used to determine the amount of abrasive particle deposition based on the abrasive particle sensing signal corresponding to the initial optical signal and the abrasive particle sensing signal corresponding to the current optical signal, and output the abrasive particle concentration value based on the amount of abrasive particle deposition.

[0011] Optionally, the optical transmission module includes:

[0012] At least two light-emitting control branches connected in parallel;

[0013] Each light-emitting control branch includes: a first amplifying unit, a first switching unit and a light-emitting unit;

[0014] The first input end of the first amplifying unit is connected to the first output end of the digital-to-analog conversion module, and the second input end of the first amplifying unit is connected to the output end of the first amplifying unit;

[0015] The first end of the first switch unit is connected to the output end of the first amplifying unit, the second end of the first switch unit is connected to the light emitting unit, and the control end of the first switch unit is connected to the control module.

[0016] Optionally, the first amplifying unit includes a first amplifier; the first switching unit includes a triode; and the light emitting unit includes an LED;

[0017] The in-phase input terminal of the first amplifier is connected to the first output terminal of the digital-to-analog conversion module, and the first input terminal of the first amplifier is used to input the first analog signal; the inverting input terminal of the first amplifier is used to be connected to the output terminal of the first amplifier; the first amplifier is used to output a first level signal when receiving the first analog signal;

[0018] The collector of the transistor is connected to the output end of the first amplifier, the emitter of the transistor is connected to the LED, the base of the transistor is connected to the output end of the control module, and the transistor is used to be turned on according to the second control signal;

[0019] The LED is used to emit light when the triode is turned on and the first amplifier outputs a first level signal.

[0020] Optional, light sensing detection module, including:

[0021] at least two light sensing control branches connected in parallel;

[0022] Each light sensing control branch includes: a second comparison unit, a filtering unit and a light sensing unit;

[0023] The first input end of the second comparison unit is connected to the second output end of the digital-to-analog conversion module, the second input end of the second comparison unit is connected to the light sensing unit, the output end of the second comparison unit is connected to the first end of the filtering unit, and the second end of the filtering unit is connected to the control module.

[0024] Optionally, the second comparing unit includes a second amplifier, the light sensing unit includes a light sensor, and the filtering unit includes a first inductor and a first capacitor;

[0025] The non-inverting input terminal of the second amplifier is connected to the second output terminal of the digital-to-analog conversion module, the inverting input terminal of the second amplifier is connected to the light sensor, the output terminal of the second amplifier is connected to the first terminal of the first inductor, the second terminal of the first inductor is connected to the first terminal of the first capacitor and the control module, and the second terminal of the first capacitor is grounded;

[0026] The optical sensor is used to collect the optical signal emitted by the optical transmitter module and convert the optical signal into an optical sensing signal;

[0027] The inverting input terminal of the second comparison unit is used to input the light sensing signal, the non-inverting input terminal of the second comparison unit is used to input the second analog signal, and the second comparison unit is used to generate the wear particle sensing signal according to the difference between the light sensing signal and the second analog signal;

[0028] The control module is used to determine the abrasive particle deposition amount according to the abrasive particle sensing signal, and output the abrasive particle concentration value according to the abrasive particle deposition amount.

[0029] Optionally, the second comparing unit further includes:

[0030] a first resistor and a second capacitor, the first resistor and the second capacitor being connected in parallel between the inverting input terminal of the second amplifier and the output terminal of the second comparison unit;

[0031] The first resistor and the second capacitor are used to increase the amplification factor of the second amplifier.

[0032] Optionally, the detection circuit further includes:

[0033] The oil sensing detection module is connected to the digital-to-analog conversion module and the control module; the control module is used to generate the fourth control signal and the fifth control signal; the digital-to-analog conversion module is used to convert the fourth control signal into a third analog signal;

[0034] The oil sensing detection module is used to generate a level signal according to the third analog signal output by the digital-to-analog conversion module, generate a transmission signal according to the level signal, and receive the transmission signal passing through the test tube to generate an oil sensing signal;

[0035] The control module is used to detect whether the oil sample has completely flowed through the test tube according to the oil sensor signal.

[0036] Optional oil sensing module, including:

[0037] a third amplifying unit, a transmitting tube, and a receiving tube; a non-inverting input terminal of the third amplifying unit is connected to the digital-to-analog conversion module, and an inverting input terminal of the third amplifying unit is connected to the output terminal of the third amplifying unit; the third amplifying unit is used to generate a level signal according to the third analog signal output by the digital-to-analog conversion module;

[0038] The receiving tube is directly opposite to the transmitting tube, and the test tube is arranged between the transmitting tube and the receiving tube, and the oil sample flows in the test tube;

[0039] The first end of the transmitting tube is connected to the output end of the third amplifying unit, the second end of the transmitting tube is grounded, and the transmitting tube is used to transmit a signal when the third amplifying unit outputs a level signal;

[0040] The first end of the receiving tube is connected to the power supply, and the second end of the receiving tube is connected to the control module. The receiving tube is used to output the oil sensing signal to the control module according to the transmission signal received from the transmitting tube.

[0041] Optionally, the third amplifying unit includes a third amplifier, and the oil sensing detection module further includes a second resistor and a third resistor;

[0042] The non-inverting input terminal of the third amplifier is connected to the digital-to-analog conversion module, the inverting input terminal of the third amplifier is connected to the output terminal of the third amplifier, the first end of the second resistor is connected to the output terminal of the third amplifier, the second end of the second resistor is connected to the first end of the transmitting tube, and the second end of the transmitting tube is grounded;

[0043] A first end of the third resistor is connected to the second end of the receiving tube, and a second end of the third resistor is grounded.

[0044] According to another aspect of the present invention, this embodiment provides a direct-reading ferroscope, comprising: the detection circuit proposed in any item of the first aspect.

[0045] The detection circuit provided in the embodiment of the present invention drives the light emitting module to emit a light signal through the control module and the digital-to-analog conversion module, and collects at least one light sensing signal through the light sensing detection module, and generates at least one abrasive particle sensing signal by calculating the difference between the light sensing signal and the second analog signal transmitted by the analog-to-digital conversion module. Based on the abrasive particle sensing signal, the control module compares the abrasive particle sensing signal corresponding to the current light signal with the abrasive particle sensing signal corresponding to the initial light signal before the deposition process begins, determines the amount of abrasive particle deposition, and outputs the abrasive particle concentration value based on the amount of abrasive particle deposition. The detection circuit provided in this embodiment coordinately controls the light emitting module and the light sensing detection module through the digital-to-analog conversion module and the control module, has a strong anti-interference ability, improves the detection accuracy of the abrasive particle concentration value output by the control module, and solves the problem that the existing iron spectrometer is easily interfered with by external signals when performing abrasive particle collection and analysis, and has poor detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0047] Figure 1 This is a schematic structural diagram of a detection circuit provided by an embodiment of the present utility model;

[0048] Figure 2This is a structural diagram of an optical transmission module of another detection circuit provided by an embodiment of the present utility model;

[0049] Figure 3 This is a structural diagram of a light sensing detection module of another detection circuit provided by an embodiment of the present utility model;

[0050] Figure 4 This is a structural diagram of another detection circuit provided by an embodiment of the present utility model;

[0051] Figure 5 It is a structural schematic diagram of a direct-reading ferrogram provided by an embodiment of the present utility model. DETAILED DESCRIPTION

[0052] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0053] Based on the above technical problems, this embodiment proposes the following solutions:

[0054] Figure 1 This is a schematic diagram of the structure of a detection circuit provided by an embodiment of the present utility model. Figure 1 The detection circuit 100 provided by the embodiment of the present invention includes: a control module 1, which is used to output a first control signal, a second control signal and a third control signal; a digital-to-analog conversion module 2, which is connected to the control module 1, and the digital-to-analog conversion module 2 is used to convert the first control signal into a first analog signal, and convert the third control signal into a second analog signal; a light transmitting module 3, which is connected to the digital-to-analog conversion module 2 and the control module 1, and the transmitting module is used to transmit a light signal according to the first analog signal and the second control signal; a light sensing detection module 4, which is opposite to the light transmitting module 3, and the light sensing detection module 4 is connected to the control module 1 and the digital-to-analog conversion module 2, and the light sensing detection module 4 is used to collect at least one light sensing signal and generate at least one wear particle sensing signal by the difference between the light sensing signal and the second analog signal; the control module 1 is used to determine the amount of abrasive deposition based on the wear particle sensing signal corresponding to the initial light signal and the wear particle sensing signal corresponding to the current light signal, and output the abrasive concentration value according to the amount of abrasive deposition.

[0055] Specifically, the control module may include a controller such as a single-chip microcomputer, an FPGA (Field Programmable Gate Array), or the like. The control module may output a first control signal, a second control signal, and a third control signal in response to a detection operation requirement. The first control signal may be a voltage signal. The first control signal may be a digital voltage signal. The digital-to-analog conversion module 2 converts the first control signal into a first analog signal. The first analog signal may be an analog voltage signal. The second control signal may be a digital voltage signal. The third control signal may be a digital voltage signal, and the third control signal is converted into a second analog signal by the digital-to-analog conversion module 2. The second analog signal may be an analog voltage signal.

[0056] The direct-reading ferroscope is used to detect the abrasive particle concentration and particle size distribution of the oil flowing through the test tube. The optical transmitter module 3 is controlled by a second control signal transmitted by the control module 1 and driven by a first analog signal transmitted by the digital-to-analog converter module 2 to emit an optical signal. The optical signal is emitted in a direction directly facing the test tube to be tested. If abrasive particles are present in the test tube, they will block the optical signal.

[0057] The optical sensing module 4 and the optical emitting module 3 are located on opposite sides of the test tube. The optical sensing module 4 detects the light signal transmitted through the oil and, based on its intensity, converts it into a light sensing signal. The light sensing signal is an electrical signal, such as a voltage signal. The size of the light sensing signal that can be converted varies depending on the size of the abrasive particles and the degree of light obstruction they cause.

[0058] The optical sensing module 4 generates an abrasive particle sensing signal based on the difference between the detected optical sensing signal and the second analog signal. The abrasive particle sensing signal can be a level signal. The control module 1 determines the current abrasive particle deposition amount based on the abrasive particle sensing signal and the relationship between the abrasive particle deposition amount. The control module 1 can output an abrasive particle concentration value based on the abrasive particle deposition amount and the relationship between the abrasive particle deposition amount and the abrasive particle concentration.

[0059] Since the optical sensing detection module 4 can collect at least one optical sensing signal, such a configuration can collect optical sensing signals at different positions of the test tube as needed, and detect the wear particle concentration at different positions as needed.

[0060] The detection circuit powers the light emitting module 3, which generates a light signal that illuminates the test tube. A light sensing module 4 is placed on the other side of the test tube, opposite the light signal. This module is used to measure light intensity. Before the deposition process begins, the light sensing module 4 measures the initial light intensity of the light emitting module 3. After the deposition process begins, abrasive particles in the oil in the test tube gradually settle within the test tube under the influence of gravity and magnetic fields. While the light beam emitted by the light emitting module 3 remains constant, the light intensity measured by the light sensing module 4 changes accordingly. In response to the detection operation instruction, the control module 1 collects the abrasive particle sensing signal generated by the light sensing module 4. Using an algorithm within the microprocessor of the control module 1, the abrasive particle sensing signal corresponding to the current light signal is compared with the abrasive particle sensing signal corresponding to the initial light signal before the deposition process begins, thereby calculating the corresponding abrasive particle concentration value. The abrasive particle concentration value is a direct reading of the abrasive particle concentration.

[0061] The detection circuit provided in this embodiment drives the light emitting module 3 to emit a light signal through the control module 1 and the digital-to-analog conversion module 2, and collects at least one light sensing signal through the light sensing detection module 4. The difference between the light sensing signal and the second analog signal transmitted by the analog-to-digital conversion module is used to generate at least one abrasive particle sensing signal. Based on the abrasive particle sensing signal, the control module 1 compares the abrasive particle sensing signal corresponding to the current light signal with the abrasive particle sensing signal corresponding to the initial light signal before the deposition process begins, determines the amount of abrasive particle deposition, and outputs an abrasive particle concentration value based on the amount of abrasive particle deposition. The detection circuit provided in this embodiment coordinates the control module 2 and the digital-to-analog conversion module 2 and the control module 1 to control the light emitting module 3 and the light sensing detection module 4. It has strong anti-interference capabilities, improves the detection accuracy of the abrasive particle concentration value output by the control module 1, and solves the problem that the existing ferroscope is easily interfered with by external signals when performing abrasive particle collection and analysis, resulting in poor detection accuracy.

[0062] Optional, Figure 2 This is a schematic diagram of the structure of the optical transmitter module of another detection circuit provided by the embodiment of the present utility model. Figure 2 The optical transmission module 3 includes: at least two light-emitting control branches 30 connected in parallel; each light-emitting control branch 30 includes: a first amplifying unit 31, a first switching unit 32 and a light-emitting unit 33; the first input end of the first amplifying unit 31 is connected to the first output end of the digital-to-analog conversion module 2, and the second input end of the first amplifying unit 31 is connected to the output end of the first amplifying unit 31; the first end of the first switching unit 32 is connected to the output end of the first amplifying unit 31, the second end of the first switching unit 32 is connected to the light-emitting unit 33, and the control end of the first switch unit 32 is connected to the control module 1.

[0063] Specifically, each light control branch 30 is used to transmit a light signal. The light transmitting module 3 can provide at least two light signals. One light signal can be set at the entrance of the test tube, and the other can be set at the exit of the test tube to respectively detect the distribution and concentration of large and small abrasive particles. The light emitting unit 33 can be connected to the second end of the first switch unit 32 via a terminal. When the first switch unit 32 is turned on in response to the second control signal received at its control end, the output end of the first amplifying unit 31 is connected to the light emitting unit 33.

[0064] The first input terminal of the first amplifier unit 31 is used to input a first analog signal, and the second input terminal of the first amplifier unit 31 is connected to the output terminal of the first amplifier unit 31. The first amplifier unit 31 may include an operational amplifier. When a second control signal is transmitted to the first input terminal of the first amplifier unit 31, the second control signal is amplified with the electrical signal at the first input terminal to generate a voltage signal. The voltage signal is transmitted to the light-emitting unit 33 through the conductive first switch unit 32, thereby driving the light-emitting unit 33 to emit light and output a light signal to the test tube.

[0065] Optionally, based on the above embodiments, see Figure 2 The first amplifying unit 31 includes a first amplifier 311; the first switching unit 32 includes a transistor 321; the light-emitting unit 33 includes an LED; the non-inverting input terminal of the first amplifier is connected to the first output terminal of the digital-to-analog conversion module 2, and the first input terminal of the first amplifier is used to input a first analog signal; the inverting input terminal of the first amplifier is used to be connected to the output terminal of the first amplifier; the first amplifier is used to output a first level signal when receiving the first analog signal; the collector of the transistor 321 is connected to the output terminal of the first amplifier, the emitter of the transistor 321 is connected to the LED, the base of the transistor 321 is connected to the output terminal of the control module 1, and the transistor 321 is used to be turned on according to the second control signal; the LED is used to emit light when the transistor 321 is turned on and the first amplifier outputs the first level signal.

[0066] Specifically, the first amplification unit 31 includes a first amplifier 311. The output of the first amplifier 311 amplifies and follows the first analog signal input to the first input, outputting a first-level signal. The first switching unit 32 can be a transistor 321. Transistor 321 can be an NPN-type small-signal bipolar transistor. The transistor 321 used in this embodiment has a collector current of 600 mA and a collector-base voltage of 60 V, making it suitable for medium-power amplification and switching applications and capable of effectively controlling current flow. When transistor 321 is turned on in response to the second control signal and the first amplifier outputs a first-level signal, the first-level signal drives an LED to emit light, which then outputs a light signal to the test tube. The light signal passes through the test tube and then through the oil to be tested. In the initial detection state, when there is no oil in the test tube, the light signal is relatively strong. When the oil to be tested is present in the test tube and wear particle detection is performed, the light signal cannot pass through the wear particles, and the light signal is blocked and reflected where the wear particles are present.

[0067] Optional, Figure 3 This is a schematic diagram of the structure of a light sensing detection module of another detection circuit provided by the embodiment of the present utility model. Figure 3 The light sensing detection module 4 includes: at least two light sensing control branches 40 connected in parallel; each light sensing control branch 40 includes: a second comparing unit 41, a filtering unit 42 and a light sensing unit 43; a first input end of the second comparing unit 41 is connected to the second output end of the digital-to-analog conversion module 2, a second input end of the second comparing unit 41 is connected to the light sensing unit 43, an output end of the second comparing unit 41 is connected to a first end of the filtering unit 42, and a second end of the filtering unit 42 is connected to the control module 1.

[0068] Specifically, the optical sensing detection module 4 includes at least two optical sensing control branches 40. Each optical sensing control branch 40 is capable of detecting one optical signal. The number of optical sensing control branches 40 can be set as needed. Optionally, the number of optical sensing control branches 40 can be set to correspond one-to-one with the number of light emission control branches 30 of the optical emission module 3.

[0069] The second comparison unit 41 performs comparison and amplification functions. The first input of the second comparison unit 41 is used to receive the second analog signal transmitted by the digital-to-analog conversion module 2. The second input of the second comparison unit 41 is used to receive the light sensor signal. The second comparison unit 41 compares the received light sensor signal with the second analog signal, generates an initial wear particle sensor signal based on the comparison result, and amplifies the initial wear particle sensor signal to generate an amplified initial wear particle sensor signal. The filtering unit 42 filters the initial wear particle sensor signal to generate a wear particle sensor signal. The wear particle sensor signal is transmitted to the control module 1.

[0070] Optionally, based on the above embodiments, continue to refer to Figure 3 The second comparison unit 41 may include a second amplifier 411, the light sensing unit 43 includes a light sensor 431, and the filtering unit 42 includes a first inductor L1 and a first capacitor C1; the non-inverting input terminal of the second amplifier 411 is connected to the second output terminal of the digital-to-analog conversion module 2, the inverting input terminal of the second amplifier 411 is connected to the light sensor 431, the output terminal of the second amplifier 411 is connected to the first end of the first inductor L1, the second end of the first inductor L1 is connected to the first end of the first capacitor C1 and the control module 1, and the second end of the first capacitor C1 is grounded; the light sensor 431 is used to collect the light signal emitted by the light transmitting module 3 and convert the light signal into a light sensing signal; the inverting input terminal of the second comparison unit 41 is used to input the light sensing signal, and the non-inverting input terminal of the second comparison unit 41 is used to input the second analog signal, and the second comparison unit 41 is used to generate an abrasive particle sensing signal according to the difference between the light sensing signal and the second analog signal; the control module 1 is used to determine the abrasive particle deposition amount according to the abrasive particle deposition amount, and output the abrasive particle concentration value according to the abrasive particle deposition amount.

[0071] Specifically, in the initial phase before detection begins, the second amplifier 411 compares and amplifies the optical sensor signal and the second analog signal to generate an abrasive particle sensor signal corresponding to the initial optical signal. After detection begins, the second amplifier 411 compares and amplifies the current optical sensor signal and the second analog signal. The second comparison unit 41 generates a current abrasive particle sensor signal based on the difference between the current optical sensor signal and the second analog signal. The control module 1 is configured to determine the amount of abrasive particle deposition based on the abrasive particle sensor signal corresponding to the initial optical signal and the abrasive particle sensor signal corresponding to the current optical signal, and output an abrasive particle concentration value based on the amount of abrasive particle deposition.

[0072] Optionally, based on the above embodiments, continue to refer to Figure 3 The second comparison unit 41 also includes: a first resistor R1 and a second capacitor C2, the first resistor R1 and the second capacitor C2 are connected in parallel between the inverting input terminal of the second amplifier 411 and the output terminal of the second comparison unit 41; the first resistor R1 and the second capacitor C2 are used to increase the amplification factor of the second amplifier 411.

[0073] Specifically, the first resistor R1 serves as a gain resistor. The first resistor R1 and the second capacitor C2 are used to adjust the gain value of the second amplifier 411. The resistance value of the first resistor R1 and the capacitance value of the second capacitor C2 can be set as needed, and are not limited here.

[0074] Optional, Figure 4 This is a schematic diagram of another detection circuit provided by the embodiment of the present utility model. Figure 4The detection circuit also includes: an oil sensing detection module 5, which is connected to the digital-to-analog conversion module 2 and the control module 1; the control module 1 is used to generate a fourth control signal and a fifth control signal; the digital-to-analog conversion module 2 is used to convert the fourth control signal into a third analog signal; the oil sensing detection module 5 is used to generate a level signal according to the third analog signal output by the digital-to-analog conversion module 2, generate a transmission signal according to the level signal, and receive the transmission signal passing through the test tube to generate an oil sensing signal; the control module 1 is used to detect whether the oil sample has completely flowed through the test tube according to the oil sensing signal.

[0075] Specifically, the oil sensing module 5 is used to detect whether the entire oil sample has flowed through the test tube. The oil sensing module 5 generates a level signal based on the third analog signal output by the digital-to-analog conversion module 2, and then generates a transmission signal based on the level signal. The transmission signal can be a light signal. After passing through the test tube, the transmission signal is received by the receiving end of the oil sensing module 5, which generates an oil sensing signal. The oil sensing signal is transmitted to the control module 1. The control module 1 determines whether the oil sample has completely flowed through the test tube based on the difference between the current oil sensing signal and the oil sensing signal in the initial state when no oil sample has flowed through the test tube.

[0076] Optionally, based on the above embodiments, continue to refer to Figure 4 The oil sensing detection module 5 includes: a third amplifying unit 51, a transmitting tube 52 and a receiving tube 53; the non-inverting input end of the third amplifying unit 51 is connected to the digital-to-analog conversion module 2, and the inverting input end of the third amplifying unit 51 is connected to the output end of the third amplifying unit 51; the third amplifying unit 51 is used to generate a level signal according to the third analog signal output by the digital-to-analog conversion module 2; the receiving tube 53 is directly opposite to the transmitting tube 52, and a test tube is arranged between the transmitting tube 52 and the receiving tube 53, and an oil sample flows in the test tube; a first end of the transmitting tube 52 is connected to the output end of the third amplifying unit 51, and a second end of the transmitting tube 52 is grounded. The transmitting tube 52 is used to transmit a signal when the third amplifying unit 51 outputs a level signal; a first end of the receiving tube 53 is connected to a power supply, and a second end of the receiving tube 53 is connected to the control module 1. The receiving tube 53 is used to output an oil sensing signal to the control module 1 according to the transmission signal received from the transmitting tube 52.

[0077] Specifically, the third amplifying unit 51 amplifies the input third analog signal and outputs a level signal, the voltage of which may be, for example, 1.25V. The level signal is transmitted to the transmitting tube 52, which generates a transmission signal under the drive of the level signal. The transmission signal may be a light signal. The receiving tube 53 directly opposite the transmitting tube 52 receives the transmission signal passing through the test tube, and the receiving tube 53 outputs an oil sensing signal to the control module 1 based on the transmission signal received from the transmitting tube 52. The control module 1 determines whether the oil sample has completely flowed through the test tube based on the difference between the current oil sensing signal and the oil sensing signal when no oil sample flows through the test tube in the initial state. The test ends after the oil sample has completely flowed through the test tube.

[0078] Optionally, based on the above embodiments, continue to refer to Figure 4 The third amplifying unit 51 includes a third amplifier 511, and the oil sensing detection module 5 also includes a second resistor R2 and a third resistor R3; the non-inverting input terminal of the third amplifier 511 is connected to the digital-to-analog conversion module 2, the inverting input terminal of the third amplifier 511 is connected to the output terminal of the third amplifier 511, the first end of the second resistor R2 is connected to the output terminal of the third amplifier 511, the second end of the second resistor R2 is connected to the first end of the transmitting tube 52, and the second end of the transmitting tube 52 is grounded; the first end of the third resistor R3 is connected to the second end of the receiving tube 53, and the second end of the third resistor R3 is grounded.

[0079] Specifically, the third amplifier 511 performs voltage following and amplification functions, and the second resistor R2 and the third resistor R3 perform current limiting protection functions.

[0080] This embodiment provides a direct-reading ferroscope. Figure 5 This is a schematic diagram of the structure of a direct-reading ferroscope provided by the embodiment of the present utility model. Figure 5 This embodiment provides a direct-reading ferrogram 200 including the detection circuit 100 provided by any of the above embodiments, and has the beneficial effects of the detection circuit provided by any of the above embodiments, which will not be repeated here.

[0081] Note that the above are merely preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will appreciate that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions are possible for those skilled in the art without departing from the scope of protection of the present invention. Therefore, while the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the scope of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A detection circuit, characterized in that: include: A control module, configured to output a first control signal, a second control signal, and a third control signal; a digital-to-analog conversion module connected to the control module, configured to convert the first control signal into a first analog signal and convert the third control signal into a second analog signal; an optical transmission module, connected to the digital-to-analog conversion module and the control module, the transmission module being configured to transmit an optical signal according to the first analog signal and the second control signal; The optical sensing detection module is directly opposite to the optical emission module and is connected to the control module and the digital-to-analog conversion module. The optical sensing detection module is used to collect at least one optical sensing signal and generate at least one abrasive particle sensing signal based on the difference between the optical sensing signal and the second analog signal; the control module is used to determine the amount of abrasive particle deposition based on the abrasive particle sensing signal corresponding to the initial optical signal and the abrasive particle sensing signal corresponding to the current optical signal, and output the abrasive particle concentration value based on the amount of abrasive particle deposition.

2. The detection circuit according to claim 1, characterized in that: The optical transmission module includes: At least two light-emitting control branches connected in parallel; Each of the light-emitting control branches includes: a first amplifying unit, a first switching unit and a light-emitting unit; The first input end of the first amplifying unit is connected to the first output end of the digital-to-analog conversion module, and the second input end of the first amplifying unit is connected to the output end of the first amplifying unit; A first end of the first switch unit is connected to the output end of the first amplifying unit, a second end of the first switch unit is connected to the light emitting unit, and a control end of the first switch unit is connected to the control module.

3. The detection circuit according to claim 2, characterized in that: The first amplifying unit includes a first amplifier; the first switching unit includes a transistor; the light emitting unit includes an LED; The non-inverting input terminal of the first amplifier is connected to the first output terminal of the digital-to-analog conversion module, and the first input terminal of the first amplifier is used to input the first analog signal; the inverting input terminal of the first amplifier is used to be connected to the output terminal of the first amplifier; the first amplifier is used to output a first level signal when receiving the first analog signal; The collector of the transistor is connected to the output end of the first amplifier, the emitter of the transistor is connected to the LED, the base of the transistor is connected to the output end of the control module, and the transistor is used to be turned on according to the second control signal; The LED is configured to emit light when the transistor is turned on and the first amplifier outputs a first level signal.

4. The detection circuit according to claim 1, characterized in that: The light sensing detection module includes: at least two light sensing control branches connected in parallel; Each of the light sensing control branches includes: a second comparison unit, a filtering unit and a light sensing unit; The first input end of the second comparing unit is connected to the second output end of the digital-to-analog conversion module, the second input end of the second comparing unit is connected to the light sensing unit, the output end of the second comparing unit is connected to the first end of the filtering unit, and the second end of the filtering unit is connected to the control module.

5. The detection circuit according to claim 4, characterized in that: The second comparing unit includes a second amplifier, the light sensing unit includes a light sensor, and the filtering unit includes a first inductor and a first capacitor; A non-inverting input terminal of the second amplifier is connected to the second output terminal of the digital-to-analog conversion module, an inverting input terminal of the second amplifier is connected to the light sensor, an output terminal of the second amplifier is connected to the first terminal of the first inductor, a second terminal of the first inductor is connected to the first terminal of the first capacitor and the control module, and a second terminal of the first capacitor is grounded; The optical sensor is used to collect the optical signal emitted by the optical transmission module and convert the optical signal into an optical sensing signal; The inverting input terminal of the second comparing unit is used to input the light sensing signal, the non-inverting input terminal of the second comparing unit is used to input the second analog signal, and the second comparing unit is used to generate the wear particle sensing signal according to the difference between the light sensing signal and the second analog signal; The control module is used to determine the abrasive particle deposition amount according to the abrasive particle sensing signal, and output an abrasive particle concentration value according to the abrasive particle deposition amount.

6. The detection circuit according to claim 5, characterized in that: The second comparing unit further includes: a first resistor and a second capacitor, wherein the first resistor and the second capacitor are connected in parallel between the inverting input terminal of the second amplifier and the output terminal of the second comparing unit; The first resistor and the second capacitor are used to increase the amplification factor of the second amplifier.

7. The detection circuit according to claim 1, characterized in that: The detection circuit further includes: an oil sensing detection module connected to the digital-to-analog conversion module and the control module; the control module is used to generate a fourth control signal and a fifth control signal; the digital-to-analog conversion module is used to convert the fourth control signal into a third analog signal; The oil sensing detection module is used to generate a level signal according to the third analog signal output by the digital-to-analog conversion module, generate a transmission signal according to the level signal, and receive the transmission signal passing through the test tube to generate an oil sensing signal; The control module is used to detect whether the oil sample has completely flowed through the test tube according to the oil sensor signal.

8. The detection circuit according to claim 7, characterized in that: The oil sensing detection module includes: a third amplifying unit, a transmitting tube, and a receiving tube; a non-inverting input terminal of the third amplifying unit is connected to the digital-to-analog conversion module, and an inverting input terminal of the third amplifying unit is connected to the output terminal of the third amplifying unit; the third amplifying unit is used to generate a level signal according to the third analog signal output by the digital-to-analog conversion module; The receiving tube is directly opposite to the transmitting tube, the testing tube is arranged between the transmitting tube and the receiving tube, and the oil sample flows in the testing tube; The first end of the transmitting tube is connected to the output end of the third amplifying unit, the second end of the transmitting tube is grounded, and the transmitting tube is used to transmit a signal when the third amplifying unit outputs a level signal; The first end of the receiving tube is connected to the power supply, and the second end of the receiving tube is connected to the control module. The receiving tube is used to output the oil sensing signal to the control module according to the transmission signal received from the transmitting tube.

9. The detection circuit according to claim 8, characterized in that: The third amplifying unit includes a third amplifier, and the oil sensing detection module also includes a second resistor and a third resistor; The non-inverting input terminal of the third amplifier is connected to the digital-to-analog conversion module, the inverting input terminal of the third amplifier is connected to the output terminal of the third amplifier, the first end of the second resistor is connected to the output terminal of the third amplifier, the second end of the second resistor is connected to the first end of the transmitting tube, and the second end of the transmitting tube is grounded; The first end of the third resistor is connected to the second end of the receiving tube, and the second end of the third resistor is grounded.

10. A direct-reading ferrogram, characterized in that: include: The detection circuit according to any one of claims 1 to 9.

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