Optical detection device and detection circuit

Abstract

The present application provides an optical detection device and a detection circuit, wherein the optical detection device includes an optical module and a detection circuit. The optical module includes a transmitting component, a conducting component and a sensing component; the transmitting component is used to transmit a preset white light signal to the conducting component; the conducting component is used to conduct a reflected light signal to the sensing component, and the reflected light signal is a preset white light signal after passing through the material to be tested in the conducting component; the sensing component is used to receive the reflected light signal and convert the reflected light signal into an electrical signal and output it to the detection circuit; the detection circuit is used to obtain the inspection result of the material to be tested according to the change of the electrical signal. By adopting the above-mentioned optical detection device, the detection of materials using white light is realized, which solves the problem that the traditional technology uses red or blue light optical sensors, resulting in a narrow range of materials that can be detected.

Description

Technical Field

[0001] The present application relates to the technical field of optical detection, and in particular to an optical detection device and a detection circuit. Background Art

[0002] Currently, most visible light sensors used to detect coils or textiles on the market are red or blue. However, since the spectral distribution of white light is wider than that of red and blue, it will have a wider range of applicability when used to detect a variety of colors and materials, especially when used to detect materials with low contrast, its detection effect is more prominent than other lights.

[0003] Based on the needs in the above-mentioned scenarios, the present application proposes an optical detection device and a detection circuit to realize material detection using white light. Summary of the invention

[0004] The present application provides an optical detection device and a detection circuit, which realize the detection of materials using white light, and solve the problem that the optical sensors using red or blue light in the traditional technology result in a limited range of detectable material types.

[0005] The first aspect of the present application provides an optical detection device, which includes an optical module and a detection circuit. The optical module includes a transmitting component, a conducting component and a sensing component; the transmitting component is used to transmit a preset white light signal to the conducting component; the conducting component is used to conduct a reflected light signal to the sensing component, and the reflected light signal is a preset white light signal after passing through the material to be tested in the conducting component; the sensing component is used to receive the reflected light signal and convert the reflected light signal into an electrical signal and transmit it to the detection circuit; the detection circuit is used to obtain the inspection result of the material to be tested according to the change of the electrical signal.

[0006] The present application adopts the above-mentioned device and white light signals to detect the material to be tested, thereby making the detection process of low-contrast materials more stable and reliable, and at the same time increasing the range of material types that can be detected.

[0007] Optionally, the emitting component includes an LED light-emitting tube and a first focusing lens; the wavelength range of the light emitted by the LED light-emitting tube is 450-650nm; the first focusing lens is used to focus the light emitted by the LED light-emitting tube into the conducting component.

[0008] Optionally, the transmission component includes a refractor, an intermediate lens and a reflector; the refractor is used to receive a preset white light signal and refract the preset white light signal to the reflector; it is also used to transmit the reflected light signal to the sensing component, and the intermediate lens is placed in the middle of the optical path of the refractor and the reflector, and is used to form an object path of the material to be measured together with the reflector.

[0009] By adopting the above device, the transmitting component and the sensing component can be located on the same side of the refractor in the conducting component, which simplifies the circuits required to configure the transmitting component and the sensing component, and helps to reduce the cost of the circuit and device structure.

[0010] Optionally, the sensing component is a phototransistor.

[0011] Optionally, the sampling current output by the sensing component is inversely proportional to the width of the object path blocked by the material being measured.

[0012] A second aspect of the present application provides a detection circuit, which is applied to any one of the above-mentioned optical detection devices. The detection circuit includes: a sensor component, a first sampling resistor, a second sampling resistor, a signal amplification module, a same-direction adder, a signal adjustment module and an inverse adder; one end of the first sampling resistor and the second sampling resistor is coupled to the sensor component, and the other end is coupled to one end of the signal amplification module; the other end of the amplification module is coupled to one end of the same-direction adder; the other end of the same-direction adder is coupled to one end of the inverse adder, and one end of the signal adjustment module is coupled to one end of the inverse adder; the other end of the inverse adder outputs a detection signal.

[0013] By adopting the detection circuit, the weak sampling signal is accurately amplified and filtered, thereby improving the detection accuracy.

[0014] Optionally, the signal amplification module includes a first reverse amplifier, a first reverse follower, a second reverse amplifier and a second reverse follower; the reverse input terminal of the first reverse amplifier is coupled to the other end of the first sampling resistor, and the output terminal is coupled to the reverse input terminal of the first reverse follower; the output terminal of the first reverse follower is coupled to the positive input terminal of the same-direction adder; the reverse input terminal of the second reverse amplifier is coupled to the other end of the second sampling resistor, and the output terminal is coupled to the reverse input terminal of the second reverse follower; the output terminal of the second reverse follower is coupled to the positive input terminal of the same-direction adder.

[0015] By adopting the above method, the detection circuit has better adaptability. By adjusting the parameters of the first reverse amplifier and the second reverse amplifier, the weak phototransistor current output conversion voltage signal can be amplified, and the first reverse follower and the second reverse follower can be adjusted by the first adjustable resistor and the second adjustable resistor to compensate for the difference between the two output pins of the phototransistor, thereby reducing the difference between the output signals of each sensor in mass production.

[0016] Optionally, it is characterized in that the signal adjustment module includes an adjustable resistor and a same-direction follower; one end of the adjustable resistor is coupled to the power supply end, and the other end is coupled to the positive input end of the same-direction follower; the output end of the same-direction follower is coupled to the reverse input end of the reverse adder.

[0017] Optionally, any one of the first reverse amplifier and the second reverse amplifier includes: a first resistor, a second resistor and an operational amplifier; one end of the first resistor is coupled to the reverse input terminal of the operational amplifier, and the other end is coupled to the other end of the first sampling resistor or the second sampling resistor; one end of the second resistor is coupled to the positive input terminal of the operational amplifier, and the other end is coupled to the output terminal of the operational amplifier.

[0018] Optionally, the signal amplification module further includes a first adjustable resistor and a second adjustable resistor; the first adjustable resistor is connected in series with the first reverse amplifier and the first reverse follower; the second adjustable resistor is connected in series with the second reverse amplifier and the second reverse follower.

[0019] By dividing the sampling signal into two parts and processing them separately, the stability of the system can be improved. Since the signal amplification module also includes a first adjustable resistor and a second adjustable resistor, the output difference between the first reverse follower and the second reverse follower can be reduced by adjusting the first adjustable resistor and the second adjustable resistor, thereby offsetting the difference between the two output ends of the sensor component.

[0020] Compared with the related art, the beneficial effects of this application are:

[0021] 1. The present application adopts the above-mentioned device and white light signals to detect the material to be tested, thereby making the detection process of materials with low contrast more stable and reliable, and at the same time increasing the range of materials that can be detected.

[0022] 2. By adopting the above device, the transmitting component and the sensing component can be located on the same side of the refractor in the conducting component, which simplifies the circuits required to realize the transmitting component and the sensing component, and helps to reduce the cost of the circuit and device structure.

[0023] 3. By adopting the above method, the detection circuit has better adaptability, and the weak phototransistor current output conversion voltage signal can be amplified by adjusting the parameters of the first reverse amplifier and the second reverse amplifier, and the first reverse follower and the second reverse follower are adjusted by the first adjustable resistor and the second adjustable resistor to compensate for the difference between the two output pins of the phototransistor, thereby reducing the difference between the output signals of each sensor in mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic diagram of the principle of an optical detection device provided in an embodiment of the present application;

[0025] Figure 2 It is a structural schematic diagram of a detection circuit provided in an embodiment of the present application.

[0026] Figure numerals: Rs1, first sampling resistor; Rs2, first sampling resistor; 10, signal amplification module; 101, first reverse amplifier; 102, first reverse follower; 103, second reverse amplifier; 104, second reverse follower; 20, same-direction adder; 30, signal adjustment module; 301, adjustable resistor; 302, same-direction follower; 40, reverse adder. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below in conjunction with the drawings in the embodiments of this specification. Obviously, the described embodiments are only part of the embodiments of this application, not all of the embodiments.

[0028] In the description of the embodiments of the present application, words such as "illustrative", "for example" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "illustrative", "for example" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "illustrative", "for example" or "for example" is intended to present related concepts in a specific way.

[0029] In the description of the embodiments of the present application, unless otherwise stated, the meaning of the term "multiple" refers to two or more. For example, multiple systems refer to two or more systems, and multiple screen terminals refer to two or more screen terminals. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. The terms "include", "comprise", "have" and their variations all mean "including but not limited to", unless otherwise specifically emphasized.

[0030] The present application embodiment provides an optical detection device, such as Figure 1 As shown, the device includes an optical module and a detection circuit, the optical module includes a transmitting component, a conducting component and a sensing component; the transmitting component is used to transmit a preset white light signal to the conducting component; the conducting component is used to conduct a reflected light signal to the sensing component, and the reflected light signal is a preset white light signal after passing through the material to be tested in the conducting component; the sensing component is used to receive the reflected light signal and convert the reflected light signal into an electrical signal and output it to the detection circuit; the detection circuit is used to obtain the inspection result of the material to be tested according to the change of the electrical signal.

[0031] The materials to be tested in the embodiments of the present application include coils and textiles. Specifically, various coils are included, such as paper, textiles, non-woven fabrics, plastic films, etc. These materials may have different colors, textures, pollution levels and other characteristics, and their quality and performance need to be evaluated by optical detection. In addition, the materials to be tested may also include various textiles, such as cotton, silk, wool, woolen yarn, etc. These materials may have different fiber types, weaves, thicknesses, weights and other characteristics, and their characteristics and quality need to be evaluated by optical detection. In addition, the materials to be tested may also include various plastic products, such as plastic films, plastic bottles, plastic bags, etc. These materials may have different colors, textures, transparency and other characteristics, and their characteristics and quality need to be evaluated by optical detection. In the embodiments of the present application, the specific use of the test results of the materials to be tested is not specifically limited. It can be understood that the test results of the materials to be tested in the embodiments of the present application can be applied to any of the above-mentioned specific uses.

[0032] In a possible implementation, Figure 1 As shown, the emitting component includes an LED light-emitting tube and a first focusing lens; the wavelength range of the light emitted by the LED light-emitting tube is 450-650nm; the first focusing lens is used to focus the light emitted by the LED light-emitting tube into the conducting component.

[0033] In the embodiment of the present application, since the light emitted by the LED light-emitting tube has a divergence problem during the propagation process, a first focusing lens is added in front of the LED light-emitting tube to allow the white light to be irradiated onto the refractor more concentratedly.

[0034] The preset white light signal in the embodiment of the present application adopts a specific type of LED light-emitting tube, so that the wavelength range of the emitted light is mainly 450-650nm.

[0035] In a possible implementation, Figure 1 As shown, the transmission component includes a refractor, an intermediate lens and a reflector; the refractor is used to receive a preset white light signal and refract the preset white light signal to the reflector; it is also used to transmit the reflected light signal to the sensing component, and the intermediate lens is placed in the middle of the optical path of the refractor and the reflector, and is used to form an object path of the material to be measured together with the reflector.

[0036] Specifically, if Figure 1 As shown, the transmitting component transmits the preset white light signal to the refractor. The transmitting component and the intermediate lens in the embodiment of the present application are placed horizontally, and there is a certain angle between the refractor and the transmitting component, so as to refract the preset white light signal into the intermediate lens. When there is no material to be tested in the object path formed by the intermediate lens and the reflector, the preset white light signal passes through the intermediate lens to reach the reflector, and the reflected light signal is transmitted to the sensor component through the intermediate lens, so that the sensor component sends an electrical signal and sends it to the detection circuit.

[0037] In the embodiment of the present application, when there is a material to be tested in the object path, the preset white light signal will be partially or completely blocked when it passes through the intermediate lens and irradiates the surface of the material to be tested, so that the intensity of the reflected light signal becomes low.

[0038] In a possible implementation, the sensing component is a phototransistor.

[0039] In the embodiment of the present application, the sensing component may also be a photodiode.

[0040] In a possible implementation, the sampling current output by the sensing component is inversely proportional to the width of the object path blocked by the material being measured.

[0041] In the embodiment of the present application, the sampling current output by the sensor component is proportional to the width of the object path blocked by the material being measured, which can more accurately reflect the characteristics of the material being measured.

[0042] The present application embodiment provides a detection circuit, which is applied to any of the above-mentioned optical detection devices, such as Figure 2 The detection circuit includes: a first sampling resistor Rs1, a second sampling resistor Rs2, a signal amplifying module 10, a non-inverting adder 20, a signal adjusting module 30 and an inverting adder 40; one end of the first sampling resistor Rs1 and the second sampling resistor Rs2 is coupled to the sensing component, and the other end is coupled to one end of the signal amplifying module 10; the other end of the amplifying module 10 is coupled to one end of the non-inverting adder 20; the other end of the non-inverting adder 20 is coupled to one end of the inverting adder 40, and one end of the signal adjusting module 30 is coupled to one end of the inverting adder 40; the other end of the inverting adder 40 outputs a detection signal.

[0043] In the embodiment of the present application, the first sampling resistor Rs1 and the second sampling resistor Rs2 are used to receive the current signal from the sensor component and convert it into a voltage signal. The signal amplification module 10 is a circuit module for amplifying the signal from the first sampling resistor Rs1 and the second sampling resistor Rs2, which can increase the amplitude of the signal, making the subsequent signal processing easier and more accurate. In the embodiment of the present application, the signal amplification module 10 includes a plurality of sub-modules connected in parallel, each of which can amplify part of the voltage signal and output it to the same direction adder 20; the signal adjustment module 30 adjusts the signal output by the same direction adder 20 to obtain a more accurate result. Finally, the signal output by the reverse adder 40 can be used as a detection signal to indicate the inspection result of the material under test.

[0044] In a possible implementation, the signal amplification module 10 includes a first reverse amplifier 101, a first reverse follower 102, a second reverse amplifier 103 and a second reverse follower 104; the reverse input terminal of the first reverse amplifier 101 is coupled to the other end of the first sampling resistor Rs1, and the output terminal is coupled to the reverse input terminal of the first reverse follower 102; the output terminal of the first reverse follower 102 is coupled to the positive input terminal of the same-direction adder 20; the reverse input terminal of the second reverse amplifier 103 is coupled to the other end of the second sampling resistor Rs2, and the output terminal is coupled to the reverse input terminal of the second reverse follower 104; the output terminal of the second reverse follower 104 is coupled to the positive input terminal of the same-direction adder 20.

[0045] In the embodiment of the present application, the reflected light signal reaching the sensor assembly turns on the photoelectric sensor in the sensor assembly, thereby generating a current. The current is converted into a voltage through a sampling resistor, and the voltage converted from the current is input into the first reverse amplifier 101 and the second reverse amplifier 103 in two ways, and then respectively input into the first reverse follower 102 and the second reverse follower 104. The output signals of the two reverse followers enter the same direction adder 20 at the same time, and then the same direction adder 20 enters the reverse adder 40 at the same time as the voltage divided signal provided by the -12V power supply output by the same direction follower 302 after voltage division by the adjustable resistor 301, and the output voltage of the reverse adder 40 is the sensor output voltage. Due to the different light intensities, the current generated by the photoelectric sensor is also different, and the sensor output voltage output by the reverse adder 40 varies between 0-5V.

[0046] Specifically, the signal amplification module 10 divides the sampling signal into two parts for processing, and then inputs them together into the same direction adder 20. By dividing the sampling signal into two parts, the output difference between the first reverse follower and the second reverse follower is reduced by adjusting the first adjustable resistor and the second adjustable resistor, thereby offsetting the difference between the two output ends of the sensor component. Since the first reverse amplifier and the second reverse amplifier have the same structure, their performance is also the same, so that the weak phototransistor current output conversion voltage signal is amplified, and the first adjustable resistor and the second adjustable resistor are used to adjust the first reverse follower and the second reverse follower to compensate for the difference between the two output pins of the phototransistor, thereby reducing the difference between the output signals of each sensor in mass production.

[0047] In one possible implementation, the signal adjustment module 30 includes an adjustable resistor 301 and a same-direction follower 302; one end of the adjustable resistor 301 is coupled to the power supply end, and the other end is coupled to the positive input end of the same-direction follower 302; the output end of the same-direction follower is coupled to the reverse input end of the reverse adder 40.

[0048] In a possible implementation, any one of the first reverse amplifier 101 and the second reverse amplifier 103 includes: a first resistor, a second resistor, and an operational amplifier; one end of the first resistor is coupled to the reverse input terminal of the operational amplifier, and the other end is coupled to the other end of the first sampling resistor Rs1 or the second sampling resistor Rs2; one end of the second resistor is coupled to the positive input terminal of the operational amplifier, and the other end is coupled to the output terminal of the operational amplifier.

[0049] In a possible implementation, the signal amplification module 10 further includes a first adjustable resistor and a second adjustable resistor; the first adjustable resistor is connected in series with the first reverse amplifier 101 and the first reverse follower 102; the second adjustable resistor is connected in series with the second reverse amplifier 103 and the second reverse follower 104.

[0050] In an embodiment of the present application, a first adjustable resistor and a second adjustable resistor are provided to adjust the parameters of the first reverse amplifier and the second reverse amplifier. By adjusting the first adjustable resistor and the second adjustable resistor, the output difference between the first reverse follower and the second reverse follower is reduced, thereby offsetting the difference between the two output ends of the sensor component.

[0051] By adopting the above embodiments, the present application can achieve one or more of the following beneficial effects:

[0052] 1. The present application adopts the above-mentioned device and white light signals to detect the material to be tested, thereby making the detection process of materials with low contrast more stable and reliable, and at the same time increasing the range of materials that can be detected.

[0053] 2. By adopting the above device, the transmitting component and the sensing component can be located on the same side of the refractor in the conducting component, which simplifies the circuits required to realize the transmitting component and the sensing component, and helps to reduce the cost of the circuit and device structure.

[0054] 3. By adopting the above method, the detection circuit has better adaptability. The parameters of the first reverse amplifier and the second reverse amplifier can be adjusted to amplify the weak phototransistor current output conversion voltage signal. The first reverse follower and the second reverse follower are adjusted by the first adjustable resistor and the second adjustable resistor to compensate for the difference between the two output pins of the phototransistor, thereby reducing the difference between the output signals of each sensor in mass production.

[0055] It should be noted that: when the device provided in the above embodiment realizes its function, it only uses the division of the above-mentioned functional modules as an example. In actual application, the above-mentioned functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0056] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0057] In the several embodiments provided in the present application, it should be understood that the disclosed devices can be implemented in other ways. For example, the device embodiments described above are only schematic, such as the division of the units, which is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some service interfaces, and the indirect coupling or communication connection of devices or units can be electrical or other forms.

[0058] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0059] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0060] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable memory. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, which is stored in a memory and includes several instructions for a computer device (which can be a personal computer, server or network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned memory includes: various media that can store program codes, such as USB flash drives, mobile hard drives, magnetic disks or optical disks.

[0061] The above is only an exemplary embodiment of the present disclosure and cannot be used to limit the scope of the present disclosure. That is, any equivalent changes and modifications made according to the teachings of the present disclosure are still within the scope of the present disclosure. After considering the disclosure of the specification and the truth of practice, it will be easy for those skilled in the art to think of other embodiments of the present disclosure. This application is intended to cover any variation, use or adaptive change of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary technical means in the technical field that are not recorded in the present disclosure.

Claims

1. An optical detection device, characterized in that: The device comprises an optical module and a detection circuit, wherein the optical module comprises a transmitting component, a conducting component and a sensing component; The transmitting component is used to transmit a preset white light signal to the conducting component; The transmission component is used to transmit the reflected light signal to the sensing component, and the reflected light signal is a preset white light signal after passing through the material to be tested in the transmission component; The sensing component is used to receive the reflected light signal and convert the reflected light signal into an electrical signal to send to the detection circuit; The detection circuit is used to obtain the inspection result of the tested material according to the change of the electrical signal. The transmission component includes a refractor, an intermediate lens and a reflector; The refractor is used to receive the preset white light signal and refract the preset white light signal to the reflector; and is also used to transmit the reflected light signal to the sensor component. The intermediate lens is placed between the optical paths of the refractor and the reflector, and is used to form an object path of the material to be measured together with the reflector. The emission assembly includes an LED light-emitting tube and a first focusing lens; The wavelength range of the light emitted by the LED light-emitting tube is 450-650nm; The first condensing lens is used to collect the light emitted by the LED light-emitting tube into the conducting component.

2. The device according to claim 1, characterized in that The sensing component is a phototransistor, and the peak wavelength of the phototransistor is 570nm.

3. The device according to claim 1, characterized in that The sampling current output by the sensing component is inversely proportional to the width of the object path blocked by the material being measured.

4. A detection circuit, characterized in that: The detection circuit is applied to the optical detection device according to any one of claims 1 to 3, and comprises: the sensor component, a first sampling resistor (Rs1), a second sampling resistor (Rs2), a signal amplification module (10), a same direction adder (20), a signal adjustment module (30) and a reverse adder (40); One end of the first sampling resistor (Rs1) and the second sampling resistor (Rs2) is coupled to the sensing component, and the other end is coupled to one end of the signal amplification module (10); The other end of the signal amplification module (10) is coupled to one end of the in-phase adder (20); The other end of the in-direction adder (20) is coupled to one end of the in-direction adder (40), and one end of the signal adjustment module (30) is coupled to one end of the in-direction adder (40); The other end of the inverse adder (40) outputs a detection signal.

5. The circuit according to claim 4, characterized in that The signal amplification module (10) comprises a first reverse amplifier (101), a first reverse follower (102), a second reverse amplifier (103) and a second reverse follower (104); The inverting input terminal of the first inverting amplifier (101) is coupled to the other end of the first sampling resistor (Rs1), and the output terminal is coupled to the inverting input terminal of the first inverting follower (102); The output end of the first reverse follower (102) is coupled to the positive input end of the in-phase adder (20); The inverting input terminal of the second inverting amplifier (103) is coupled to the other end of the second sampling resistor (Rs2), and the output terminal is coupled to the inverting input terminal of the second inverting follower (104); The output terminal of the second reverse follower (104) is coupled to the positive input terminal of the non-inverting adder (20).

6. The circuit according to claim 4, characterized in that The signal adjustment module (30) comprises an adjustable resistor (301) and a same-direction follower (302); One end of the adjustable resistor (301) is coupled to the power supply end, and the other end is coupled to the positive input end of the in-phase follower (302); The output end of the in-direction follower is coupled to the inverting input end of the inverting adder (40).

7. The circuit according to claim 5, characterized in that Any one of the first reverse amplifier (101) and the second reverse amplifier (103) comprises: a first resistor, a second resistor and an operational amplifier; One end of the first resistor is coupled to the inverting input end of the operational amplifier, and the other end is coupled to the other end of the first sampling resistor (Rs1) or the second sampling resistor (Rs2); One end of the second resistor is coupled to the positive input terminal of the operational amplifier, and the other end of the second resistor is coupled to the output terminal of the operational amplifier.

8. The circuit according to claim 5, characterized in that The signal amplification module (10) further comprises a first adjustable resistor and a second adjustable resistor; The first adjustable resistor is connected in series with the first reverse amplifier (101) and the first reverse follower (102); The second adjustable resistor is connected in series with the second reverse amplifier (103) and the second reverse follower (104).

Images