Ferrograph

Abstract

The invention provides a ferrograph, and relates to the technical field of optical detection. The ferrograph provided by the invention comprises an extraction module, a magnetic module, an optical module and a control module, the extraction module is used for extracting a to-be-detected sample; the magnetic module is used for adsorbing first-particle-size particles in a to-be-detected sample to the first detection area and adsorbing second-particle-size particles in the to-be-detected sample to the second detection area; the particle size of the first particle size particles is larger than that of the second particle size particles; the optical module comprises a light source and a light detector, the light source is used for emitting detection light beams to the first detection area and the second detection area, and the light detector is used for detecting intensity information of the detection light beams penetrating through the first detection area and the second detection area; the control module is connected with the optical module and used for determining the distribution condition of the metal abrasion particles. The ferrograph provided by the invention can respectively detect the distribution conditions of the particles with the first particle size and the particles with the second particle size, so that the particles with different particle sizes can be respectively detected.

Description

Technical Field

[0001] The present invention relates to the field of optical detection technology, and in particular to a ferroscope. Background Art

[0002] Ferrograph is a trend analysis instrument for analyzing used oil. It is used to measure the number of metal particles in the oil sample. The value of the number of particles comes from a beam of monochromatic light passing through the glass part at the bottom of the deposition tube. A large amount of light is blocked and attenuated by the particles deposited in the glass tube. The amount of particle deposition and the attenuation of light are linear within a certain range. The light sensor reads the change of light. After being processed by the electronic circuit system and software algorithm, the upper computer software of the instrument industrial computer directly reads the value of the number of particles.

[0003] There are differences in the particle size of metal particles. Existing ferroscopes (such as CN110879192B) can measure metal particles by adsorbing them through a magnetic device, but they cannot further clearly distinguish metal particles based on their particle size, nor can they measure the readings and distribution of metal particles of different particle sizes separately. Summary of the invention

[0004] The embodiment of the present invention provides a ferrogram, which can detect the distribution of particles of a first particle size and particles of a second particle size respectively, and detect particles of different particle sizes respectively, so as to obtain the particle size distribution of metal wear particles.

[0005] An embodiment of the present invention provides a ferroscope, comprising an extraction module, a magnetic module, an optical module and a control module; The extraction module is used to extract the sample to be tested and make the sample to be tested flow through the detection area; The magnetic module is used to adsorb particles of a first particle size in the sample to be tested to the first detection area, and particles of a second particle size to the second detection area; The particle size of the particles of the first particle size is larger than the particle size of the particles of the second particle size, and the adsorption capacity of the magnetic module for the particles of the second particle size in the first detection area is smaller than the adsorption capacity of the magnetic module for the particles of the first particle size in the second detection area; The optical module includes a light source and a light detector, the light source is used to emit a detection light beam to the first detection area and the second detection area respectively, and the light detector is used to detect the intensity information of the detection light beam transmitted through the first detection area and the second detection area respectively; The control module is connected to the optical module and is used to determine the distribution of metal wear particles according to a first intensity signal of the light beam transmitted through the first detection area and a second intensity signal of the light beam projected through the second detection area.

[0006] Optionally, the magnetic module includes a plurality of magnetic units; The number of magnetic units in the first detection area is smaller than the number of magnetic units in the second detection area.

[0007] Optionally, the magnetic module includes a first magnetic unit located in the first detection area and a second magnetic unit located in the second detection area; the distance between the first magnetic unit and the first detection area is greater than the distance between the second magnetic unit and the second detection area.

[0008] Optionally, the ferroscope further comprises a sample detection module; The sample detection module is in communication connection with the control module, and is used to send a start detection signal to the control module after detecting that the sample to be tested enters the detection area; the detection area includes a first detection area and a second detection area; The control module is also used to control the light source to emit a detection beam after receiving a start detection signal.

[0009] Optionally, the light source includes a first light emitting unit and a second light emitting unit, and the light detector includes a first detection unit and a second detection unit; The first light emitting unit is used to emit a first detection light beam to the first detection area, and the first detection unit is used to detect the intensity of the first detection light beam transmitted through the first detection area, and send a first intensity signal to the control module; The second light emitting unit is used to emit a second detection light beam to the second detection area, and the second detection unit is used to detect the intensity of the second detection light beam transmitted through the second detection area and send a second intensity signal to the control module.

[0010] Optionally, the ferroscope further comprises an interaction module, and the interaction module is communicatively connected with the control module; The control module is also used to send the first intensity signal, the second intensity signal and the distribution of metal wear particles to the interaction module; The interactive module is used to display the first intensity signal, the second intensity signal and the distribution of metal wear particles, and is also used to receive a start detection signal input by an operator through the interactive module, and send the start detection signal to the control module; The control module is also used to control the extraction module to extract the sample to be tested after receiving the start detection signal.

[0011] Optionally, the extraction module includes a pump and a sample tube; The pump is used to extract the sample to be tested and move the sample to be tested in the sample tube.

[0012] Optionally, the ferrogram further includes a waste liquid tank, and the sample to be tested flows into the waste liquid tank after passing through the detection area; the detection area includes a first detection area and a second detection area.

[0013] Optionally, the ferroscope further comprises a sample rack, and the sample rack is used for placing the sample to be tested.

[0014] Optionally, the light source comprises a laser diode and the light detector comprises a photodiode.

[0015] In the ferrograph provided by an embodiment of the present invention, the adsorption capacity of the magnetic module for particles of the second size in the first detection area is smaller than the adsorption capacity for particles of the first size in the second detection area, so that particles of the first size are adsorbed in the first detection area and particles of the second size are adsorbed in the second detection area, so that the optical module can respectively detect the distribution of particles of the first size and particles of the second size, thereby realizing separate detection of particles of different sizes, thereby obtaining the particle size distribution of metal wear particles.

[0016] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. 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 these drawings without creative work.

[0018] Figure 1 is a structural block diagram of a ferroscope provided by an embodiment of the present invention; Figure 2 is a schematic structural diagram of an optical module provided by an embodiment of the present invention; Figure 3 is a structural schematic diagram of a magnetic module and a detection area provided by an embodiment of the present invention; Figure 4 is a schematic structural diagram of another magnetic module and a detection area provided by an embodiment of the present invention; Figure 5 is a structural schematic diagram of a ferroscope provided by an embodiment of the present invention; Figure 6 is a structural block diagram of a ferroscope provided by an embodiment of the present invention; Figure 7 is a schematic structural diagram of another optical module provided by an embodiment of the present invention; Figure 8 is a schematic diagram of a first operation interface provided by an embodiment of the present invention; Fig. 9 is a schematic diagram of a second operation interface provided by an embodiment of the present invention; Fig.10 is a schematic diagram of a third operation interface provided by an embodiment of the present invention; Fig.11 is a schematic diagram of a fourth operation interface provided by an embodiment of the present invention; Fig.12 is a schematic diagram of a fifth operation interface provided by an embodiment of the present invention; Fig.13 It is a schematic diagram of the sixth operation interface provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0020] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0021] An embodiment of the present invention provides a ferroscope, Figure 1 is a structural block diagram of a ferroscope provided by an embodiment of the present invention, with reference to Figure 1 The iron spectrometer includes an extraction module 100, a magnetic module ( Figure 1), an optical module 200 and a control module 300; an extraction module 100 is used to extract a sample to be tested and allow the sample to flow through the detection area; a magnetic module is used to adsorb particles of a first particle size in the sample to be tested to the first detection area, and particles of a second particle size to the second detection area; the particle size of the first particle size particles is larger than the particle size of the second particle size particles, and the adsorption capacity of the magnetic module for the second particle size particles in the first detection area is smaller than the adsorption capacity of the first particle size particles in the second detection area; the optical module 200 includes a light source 201 and a light detector 202, the light source 201 is used to emit a detection light beam to the first detection area and the second detection area respectively, and the light detector 202 is used to detect the intensity information of the detection light beam transmitted through the first detection area and the second detection area respectively; the control module 300 is connected to the optical module 200, and is used to determine the distribution of metal wear particles based on the first intensity signal of the light beam transmitted through the first detection area and the second intensity signal of the light beam projected through the second detection area.

[0022] refer to Figure 1, the extraction module 100 can extract the sample to be tested, and the sample to be tested is a fluid containing metal wear particles. The control module 300 is in communication connection with the extraction module 100. When the ferrogram starts detection, the control module 300 controls the extraction module 100 to extract the sample to be tested. The extraction module 100 includes a pipeline, in which the sample to be tested will move with the metal wear particles. When the sample to be tested flows through the detection area, the magnetic module can adsorb the metal wear particles in the sample to be tested to the detection area; wherein, the pipeline in the detection area is made of transparent material. The metal wear particles include first particle size particles and second particle size particles. The first particle size particles are metal wear particles with a particle size greater than or equal to a threshold particle size, and the second particle size particles are metal wear particles with a particle size less than a threshold particle size. The threshold particle size is the length used to distinguish between the first particle size particles and the second particle size particles. Exemplarily, the threshold particle size is 5μm. The volume of the first particle size particles is larger, and the volume of the second particle size particles is smaller. Since the metal wear particles are made of the same material, the magnetic field force on the metal wear particles is proportional to the particle size of the metal wear particles. At the same position, the adsorption effect of the magnetic module on the first particle size particles is greater than that on the second particle size particles. After the metal wear particles enter the detection area with the oil sample to be tested, they will first pass through the first detection area. Under the action of the magnetic module, the first particle size particles with a larger adsorption effect will first stop moving with the oil sample to be tested, and will be adsorbed and deposited in the first detection area, while the second particle size particles with a smaller adsorption effect will still move with the oil sample to be tested to the second detection area. In the second detection area, the magnetic module's adsorption capacity for metal wear particles is enhanced, that is, the magnetic module's adsorption capacity for the second particle size particles in the first detection area is less than the adsorption capacity for the first particle size particles in the second detection area, and the second particle size particles will be adsorbed and deposited in the second detection area. As a result, the first particle size particles and the second particle size particles are deposited in different areas respectively.

[0023] Figure 2 is a schematic diagram of the structure of an optical module provided in an embodiment of the present invention, with reference to Figure 2 , the light source 201 can emit a detection beam to the first detection area 401 and the second detection area 402 respectively, and the light detector 202 generates first light intensity data according to the detection beam transmitted through the first detection area 401, and generates second light intensity data according to the detection beam transmitted through the second detection area 402. The more metal wear particles adsorbed and deposited in the detection area, the more detection beams are absorbed by the metal wear particles, and the weaker the detection beam received by the light detector. Therefore, the control module can determine the distribution of particles of the first particle size according to the first light intensity data, and determine the distribution of particles of the second particle size according to the second light intensity data. The distribution includes but is not limited to the number and density of metal wear particles.

[0024] In the ferrograph provided by an embodiment of the present invention, the adsorption capacity of the magnetic module for particles of the second size in the first detection area is smaller than the adsorption capacity for particles of the first size in the second detection area, so that particles of the first size are adsorbed in the first detection area and particles of the second size are adsorbed in the second detection area, so that the optical module can respectively detect the distribution of particles of the first size and particles of the second size, thereby realizing separate detection of particles of different sizes, thereby obtaining the particle size distribution of metal wear particles.

[0025] Figure 3 is a schematic diagram of a magnetic module and a detection area provided by an embodiment of the present invention, with reference to Figure 3 , the magnetic module includes a plurality of magnetic units 403 ; the number of magnetic units 403 in the first detection area 401 is less than the number of magnetic units 403 in the second detection area 402 .

[0026] Specifically, for metal wear particles of the same particle size, the adsorption capacity of each magnetic unit for metal wear particles may be the same, and / or the adsorption capacity of the magnetic unit 403 located in the first detection area 401 for metal wear particles is less than the adsorption capacity of the magnetic unit 403 located in the second detection area 402 for metal wear particles. There is a sample to be tested containing metal wear particles in the sample tube 400, and the magnetic unit 403 is used to adsorb the metal wear particles in the sample tube 400. The first detection area 401 is provided with fewer magnetic units 403, so the magnetic module has a weaker adsorption capacity for metal wear particles in the first detection area 401, and the second detection area 402 has more magnetic units 403, so the magnetic module has a stronger adsorption capacity for metal wear particles in the second detection area 402. For the first detection area 401, the particles of the first particle size are larger in size and are subjected to a larger magnetic field force than the particles of the second particle size. In the first detection area 401, the particles of the first particle size will be adsorbed and stop moving with the oil sample to be tested, while the smaller particles of the second particle size will continue to move with the oil sample to be tested to the second detection area 402. In the second detection area, the magnetic module has an enhanced adsorption capacity for the particles of the second particle size, so the particles of the second particle size will stop moving with the oil sample to be tested and be adsorbed in the second detection area. As a result, the particles of the first particle size and the particles of the second particle size are adsorbed in different areas, so that the optical module can detect the distribution of the particles of the first particle size and the particles of the second particle size respectively.

[0027] Figure 4 is a schematic diagram of another magnetic module and detection area provided in an embodiment of the present invention, referring to Figure 4The magnetic module includes a first magnetic unit 404 located in the first detection area 401 and a second magnetic unit 405 located in the second detection area 402 ; a distance L1 between the first magnetic unit 404 and the first detection area 401 is greater than a distance L2 between the second magnetic unit 405 and the second detection area 402 .

[0028] Specifically, there is a sample to be tested containing metal wear particles in the sample tube 400, and the magnetic unit is used to adsorb the metal wear particles in the sample tube 400. The farther the distance between the magnetic unit and the metal wear particles, the weaker its adsorption capacity for the metal wear particles. Therefore, the adsorption capacity of the first magnetic unit 404 for the second particle size particles is less than the adsorption capacity of the second magnetic unit 405 for the first particle size particles. The larger first particle size particles will be adsorbed in the first detection area 401, while the smaller second particle size particles will continue to move to the second detection area 402 with the oil sample to be tested. In the second detection area 402, the adsorption capacity of the magnetic module for the second particle size particles is enhanced, and the smaller second particle size particles will be adsorbed in the second detection area 402, so that the optical module can detect the distribution of the first particle size particles and the second particle size particles respectively.

[0029] Figure 5 is a schematic structural diagram of a ferroscope provided by an embodiment of the present invention, Figure 6 is a structural block diagram of a ferroscope provided by an embodiment of the present invention, with reference to Figure 5 and Figure 6 , the extraction module 100 includes a pump ( Figure 5 and Figure 6 The pump is used to extract the sample to be tested and move the sample to be tested in the sample tube 400. Optionally, the pump may include a peristaltic pump. The peristaltic pump may squeeze the sample tube 400 to generate a pressure difference in the sample tube 400, thereby moving the sample to be tested in a directional manner. The peristaltic pump may extract the sample to be tested without contacting the sample to be tested, thereby avoiding interference or contamination of the sample to be tested.

[0030] refer to Figure 5 and Figure 6 The iron spectrometer also includes a sample detection module 500; the sample detection module 500 is communicated with the control module 300, and is used to send a start detection signal to the control module 300 after detecting that the sample to be tested enters the detection area; the detection area includes a first detection area and a second detection area; the control module 300 is also used to control the light source to emit a detection beam after receiving the start detection signal.

[0031] refer to Figure 5 and Figure 6The sample detection module 500 is arranged in the detection area and can detect the transmittance of the sample tube 400. When the sample to be tested flows through the sample tube 400 in the detection area, the transmittance of the sample tube 400 will decrease. When the sample detection module 500 detects that the transmittance of the sample tube 400 decreases, a start detection signal is sent to the control module 300. After receiving the start signal, the control module 300 controls the light source to emit a detection beam to start detecting metal wear particles in the oil sample to be tested. The sample detection module 500 can determine whether the sample to be tested enters the detection area, thereby determining the start timing of the light source, so that the light source is turned off when there is no oil sample in the detection area to avoid wasting electricity.

[0032] Figure 7 is a schematic diagram of the structure of another optical module provided by an embodiment of the present invention, referring to Figure 7 The light source 201 includes a first light-emitting unit 201a and a second light-emitting unit 201b, and the light detector 202 includes a first detection unit 202a and a second detection unit 202b; the first light-emitting unit 201a is used to emit a first detection light beam to the first detection area 401, and the first detection unit 202a is used to detect the intensity of the first detection light beam transmitted through the first detection area 401, and send a first intensity signal to the control module; the second light-emitting unit 201b is used to emit a second detection light beam to the second detection area 402, and the second detection unit 202b is used to detect the intensity of the second detection light beam transmitted through the second detection area 402, and send a second intensity signal to the control module.

[0033] refer to Figure 7 , the first particle size particles deposited in the first detection area 401 will absorb the first detection beam, and the second particle size particles deposited in the second detection area 402 will absorb the second detection beam. The more metal wear particles adsorbed and deposited in the detection area, the more detection beams absorbed by the metal wear particles, and the weaker the detection beam received by the light detector 202. The first light-emitting unit 201a and the second light-emitting unit 201b can be lit at the same time to simultaneously detect the first particle size particles in the first detection area 401 and the second particle size particles in the second detection area 402, or the first light-emitting unit 201a and the second light-emitting unit 201b can also be alternately lit to avoid the detection beams emitted by the first light-emitting unit 201a and the second light-emitting unit 201b from affecting each other. The first detection unit 202a and the second detection unit 202b can respectively receive detection light beams transmitted from different areas, so that the first detection unit 202a only receives the intensity of the first detection light beam transmitted through the first detection area 401, and the second detection unit 202b only receives the intensity of the second detection light beam transmitted through the second detection area 402, so that the first detection unit 202a is not affected by the second detection light beam, and the second detection unit 202b is not affected by the first detection light beam, so that the detection result is more accurate.

[0034] refer to Figure 5 and Figure 6 The iron spectrometer also includes an interactive module 600, which is communicatively connected to the control module 300; the control module 300 is also used to send the first intensity signal, the second intensity signal and the distribution of metal wear particles to the interactive module 600; the interactive module 600 is used to display the first intensity signal, the second intensity signal and the distribution of metal wear particles, and is also used to receive a start detection signal input by an operator through the interactive module 600, and send the start detection signal to the control module 300; the control module 300 is also used to control the extraction module 100 to extract the sample to be tested after receiving the start detection signal.

[0035] Optionally, the interactive module 600 may be a touch screen. The operator may input a start detection signal through the interactive module 600. After receiving the start detection signal, the interactive module 600 sends the start detection signal to the control module 300. The control module 300 then starts the detection process, controls the extraction of the sample to be tested, and then allows the sample to be tested to flow through the detection area for detection. Inputting the start detection signal through the interactive module 600 can improve the controllability of the entire detection process. The interactive module 600 can also display the information of the first intensity signal, the second intensity signal and the distribution of metal wear particles, so that the operator can obtain relevant information of the detection in a timely manner.

[0036] refer to Figure 5 The ferroscope also includes a waste liquid tank 700. The sample to be tested flows into the waste liquid tank 700 after passing through the detection area. The detection area includes a first detection area and a second detection area. The sample to be tested flowing through the detection area means that the sample to be tested has completed the detection. The waste liquid tank 700 can store the sample to be tested that has completed the detection to prevent the sample to be tested from contaminating the detection environment.

[0037] refer to Figure 5 The ferrogram also includes a sample rack 800, which is used to place the sample to be tested. The oil sample to be tested is usually placed in a test tube 901, and the sample rack 800 can be used to place the test tube 901, and one end of the sample tube 400 is placed in the test tube, and the sample to be tested can be extracted by starting the pump. The sample rack 800 can provide a stable storage position for the test tube 901 containing the sample to be tested.

[0038] Optionally, the light source includes a laser diode, and the light detector includes a photodiode. The laser diode is small in size and is easy to integrate into the ferroscope. The laser diode has high luminous efficiency, consumes less electric energy, and has high energy efficiency. The photodiode has a high response sensitivity to the light signal, and the photodiode has a fast response speed and can quickly capture changes in the intensity of the detection beam. In addition, the photodiode has a low noise level and can output a signal with a high signal-to-noise ratio.

[0039] Optionally, the ferrogram further includes a fixed spring clip 902, a pipe joint 903 and a fixed column 904, wherein the fixed spring clip 902 is used to fix the test tube 901. The pipe joint 903 is connected to the sample tube 400, and the pipe joint 903 is the inlet and outlet of the peristaltic pump, and is used to connect the peristaltic pump and the sample tube 400. The fixed column 904 is used to fix the sample tube 400.

[0040] Based on the above description of the various structures of the ferrogram, the method of using the ferrogram to detect the oil sample to be tested is explained next.

[0041] Figure 8 is a schematic diagram of a first operation interface provided by an embodiment of the present invention, with reference to Figure 8 The standard test option is in the lower left corner of the operation interface. Click the standard test button and pop-up options include "Start", "Enter Sample Number" and "Stop". Fig. 9 is a schematic diagram of a second operation interface provided by an embodiment of the present invention, with reference to Figure 8 and Fig. 9 , click "Enter sample number", a numeric keypad pops up, you can enter a numeric number, which is the sample number of the standard test page. If the number is entered incorrectly, you can use the "Clear" key to delete it. After entering, click "OK", the keypad disappears automatically and returns to the standard test page, and the sample number position records the entered numeric number. After the sample number is entered and confirmed, the "Start" button on the page will change from a gray non-clickable state to a clickable state. After clicking "Start", the extraction module extracts the sample to be tested, so that the sample to be tested enters the detection area along the sample tube, and the oil sample analysis begins.

[0042] Fig.10 is a schematic diagram of a third operation interface provided by an embodiment of the present invention, Fig.11 is a schematic diagram of a fourth operation interface provided by an embodiment of the present invention, Fig.12 is a schematic diagram of a fifth operation interface provided by an embodiment of the present invention, Fig.13 is a schematic diagram of a sixth operation interface provided by an embodiment of the present invention, with reference to Fig.10 , Fig.11 , Fig.12 and Fig.13, the following prompts are displayed in white font to let the operator know the progress of the test: "Waiting to start", "Waiting for oil", "Oil-Start test", "Waiting for oil sample to end" and "Complete-Waiting to start". When the test is completed, the pump will work and pump the residual oil in the sample tube to the waste tank. If you find that there is still residual oil in the test tube or sample tube, you can click "Pump" to manually operate the pump to rotate. The system default pump speed is set to 1, which can be changed in the menu. Low-concentration oil samples only need to set the peristaltic pump speed to 1 to start flowing, and thick oil samples require 2 or more revolutions. When "Complete-Waiting to start" appears, the reading will be frozen. At this time, just enter the serial number of this sample to record the oil sample reading. At this point, a complete standard test is over. Remove the used sample tube and test tube, and install new sample tubes and test tubes for the next test. Between "Standard Test" and the reading is the instrument analysis timing display number, which will show the test time (in seconds). When the device times to 720 seconds (6 minutes), it means that the analysis is abnormal, the software program automatically stops the analysis, and displays the word "timeout".

[0043] In summary, combined with the above-mentioned structure of the ferrogram and the detection method, the distribution detection of metal wear particles of different particle sizes in the sample to be tested can be realized.

[0044] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A ferrography instrument, characterized in that: It includes an extraction module, a magnetic module, an optical module and a control module; The extraction module is used to extract the sample to be tested, so that the sample to be tested flows through the detection area; The magnetic module is used to adsorb particles of a first particle size in the sample to be tested to a first detection area, and particles of a second particle size to a second detection area; The particle size of the particles of the first particle size is larger than the particle size of the particles of the second particle size, and the adsorption capacity of the magnetic module for the particles of the second particle size in the first detection area is smaller than the adsorption capacity of the magnetic module for the particles of the first particle size in the second detection area; The optical module comprises a light source and a light detector, wherein the light source is used to emit a detection light beam to the first detection area and the second detection area respectively, and the light detector is used to detect intensity information of the detection light beam transmitted through the first detection area and the second detection area respectively; The control module is connected to the optical module, and is used to determine the distribution of metal wear particles based on a first intensity signal of the light beam transmitted through the first detection area and a second intensity signal of the light beam projected through the second detection area.

2. The ferrography instrument according to claim 1, characterized in that The magnetic module includes a plurality of magnetic units; The number of the magnetic units in the first detection area is smaller than the number of the magnetic units in the second detection area.

3. The ferrography instrument according to claim 1, characterized in that: The magnetic module includes a first magnetic unit located in the first detection area and a second magnetic unit located in the second detection area; the distance between the first magnetic unit and the first detection area is greater than the distance between the second magnetic unit and the second detection area.

4. The ferrography instrument according to claim 1, characterized in that: The ferroscope also includes a sample detection module; The sample detection module is in communication with the control module, and is used to send a start detection signal to the control module after detecting that the sample to be tested enters a detection area; the detection area includes the first detection area and the second detection area; The control module is also used to control the light source to emit the detection light beam after receiving the start detection signal.

5. The ferrography instrument according to claim 1, characterized in that: The light source includes a first light emitting unit and a second light emitting unit, and the light detector includes a first detection unit and a second detection unit; The first light emitting unit is used to emit a first detection light beam to the first detection area, and the first detection unit is used to detect the intensity of the first detection light beam transmitted through the first detection area, and send the first intensity signal to the control module; The second light emitting unit is used to emit a second detection light beam to the second detection area, and the second detection unit is used to detect the intensity of the second detection light beam passing through the second detection area, and send the second intensity signal to the control module.

6. The ferrography instrument according to claim 1, characterized in that The ferroscope further comprises an interaction module, and the interaction module is communicatively connected with the control module; The control module is further used to send the first intensity signal, the second intensity signal and the distribution of the metal wear particles to the interaction module; The interactive module is used to display the first intensity signal, the second intensity signal and the distribution of the metal wear particles, and is also used to receive a start detection signal input by an operator through the interactive module, and send the start detection signal to the control module; The control module is also used to control the extraction module to extract the sample to be tested after receiving the start detection signal.

7. The ferrography instrument according to claim 1, characterized in that The extraction module includes a pump and a sample tube; The pump is used to extract the sample to be tested and move the sample to be tested in the sample tube.

8. The ferrography instrument according to claim 1, characterized in that: The ferrogram further includes a waste liquid tank, into which the sample to be tested flows after passing through the detection area; the detection area includes the first detection area and the second detection area.

9. The ferrography instrument according to claim 1, characterized in that: The ferrography instrument further comprises a sample rack, and the sample rack is used for placing the sample to be tested.

10. The ferrography instrument according to claim 1, characterized in that: The light source comprises a laser diode and the light detector comprises a photodiode.

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