CN214040145U - Liquid pipe detection circuit and sample analyzer - Google Patents

Abstract

The application relates to a liquid pipe detection circuit and sample analyzer, under the condition of pipe liquid detector input power signal, according to the different states of the liquid that holds in waiting to detect the liquid pipe, can generate different high current signal. And then, voltage sampling is carried out through a voltage sampling circuit, a corresponding voltage signal is obtained and sent to an analog-to-digital converter connected with the voltage sampling circuit, the voltage signal is converted into a voltage digital signal through analog-to-digital conversion, and finally the voltage digital signal is transmitted to a processor for analysis to obtain the state information of the liquid in the liquid pipe to be detected. Through above-mentioned scheme, directly adopt analog to digital converter to gather different voltage signal and hold the state information analysis of liquid in waiting to detect the liquid pipe, to the equal ability matching analysis of different voltage digital signal obtain corresponding state information, be suitable for because hold the multiple different state analysis that the colour depth of liquid and whether have the bubble to arouse in waiting to detect the liquid pipe, have the advantage that the detection state is many.

Description

Liquid pipe detection circuit and sample analyzer

Technical Field

The application relates to the technical field of detection circuits, in particular to a liquid tube detection circuit and a sample analyzer.

Background

The liquid tube is a tube for holding liquid, such as a sample tube for storing a liquid sample, which is common in biomedicine. The liquid measure and the type that hold liquid in the liquid pipe are all not unique, if the manual liquid state that holds in to the liquid pipe of user differentiates, not only consume the manpower, but also easy identification mistake. Therefore, the liquid pipe detection device is designed to automatically detect the liquid containing state of the liquid pipe, and is particularly important in application scenes such as liquid pipe classification storage and the like.

Traditional liquid pipe detection device gathers the magnitude of voltage value and the fixed voltage value comparison of output behind the liquid pipe, finally according to the comparative result output empty pipe with have the pipe and have two kinds of testing results of liquid. However, in actual production and life, the presence or absence of bubbles in the liquid tube and the color depth of the liquid are also indexes which are concerned by users, and the traditional liquid tube detection device cannot meet the detection requirements of the users. Therefore, the traditional liquid pipe detection device has the defect of single detection state.

SUMMERY OF THE UTILITY MODEL

Therefore, it is necessary to provide a liquid tube detection circuit and a sample analyzer for solving the problem of single detection state of the conventional liquid tube detection device.

A liquid tube detection circuit comprising: the tube liquid detector is used for generating a current signal corresponding to the state of liquid contained in the liquid tube to be detected according to an input power signal; the voltage sampling circuit is connected with the tube liquid detector and is used for sampling the current signal to obtain a voltage signal; the analog-to-digital converter is connected with the voltage sampling circuit and is used for performing analog-to-digital conversion on the voltage signal to obtain a corresponding voltage digital signal; and the processor is connected with the analog-to-digital converter and used for obtaining the state information of the liquid contained in the liquid pipe to be detected according to the voltage digital signal.

In one embodiment, the liquid pipe detection circuit further comprises a filtering and amplifying circuit, and the voltage sampling circuit is connected with the analog-to-digital converter through the filtering and amplifying circuit.

In one embodiment, the filter amplifying circuit comprises an in-phase filter amplifying circuit and an anti-aliasing filter circuit, the in-phase filter amplifying circuit is connected with the voltage sampling circuit, the in-phase filter amplifying circuit is connected with the anti-aliasing filter circuit, and the anti-aliasing filter circuit is connected with the analog-to-digital converter.

In one embodiment, the in-phase filter amplifying circuit includes a first amplifier, a first resistor, a second resistor, and a first capacitor, a forward input terminal of the first amplifier is connected to the voltage sampling circuit, a reverse input terminal of the first amplifier is connected to one end of the first resistor, one end of the second resistor, and one end of the first capacitor, the other end of the first resistor is grounded, the other end of the second resistor is connected to the other end of the first capacitor and the output terminal of the first amplifier, and the output terminal of the first amplifier is connected to the anti-aliasing filter circuit.

In one embodiment, the anti-aliasing filter circuit comprises a third resistor and a second capacitor, one end of the third resistor is connected with the in-phase filter amplification circuit, the other end of the third resistor is connected with one end of the second capacitor and the analog-to-digital converter, and the other end of the second capacitor is grounded.

In one embodiment, the filter amplifying circuit further includes a filter capacitor, one end of the filter capacitor is connected to the voltage sampling circuit and the in-phase filter amplifying circuit, and the other end of the filter capacitor is grounded.

In one embodiment, the liquid tube detection circuit further comprises a constant current source driving circuit connected to the liquid tube detector.

In one embodiment, the constant current source driving circuit includes a second amplifier, a switch tube and a fourth resistor, a forward input end of the second amplifier is connected to a power supply, a reverse input end of the second amplifier is connected to one end of the fourth resistor, the other end of the fourth resistor is grounded, an output end of the second amplifier is connected to a control end of the switch tube, a first end of the switch tube is connected to the tube liquid detector, and a second end of the switch tube is connected to one end of the fourth resistor.

In one embodiment, the tube liquid detector comprises a light emitting diode and a phototransistor, the light emitting diode and the phototransistor are oppositely arranged on the outer wall of the liquid tube to be detected, the anode of the light emitting diode is connected with a power supply, the cathode of the light emitting diode is connected with the constant current source driving circuit, the control end of the phototransistor is used for receiving light emitted by the light emitting diode and transmitted by the liquid tube to be detected, the first end of the phototransistor is connected with the voltage sampling circuit, and the second end of the phototransistor is connected with the power supply.

The utility model provides a sample analyzer, includes detection module and circuit module, detection module connects circuit module, circuit module includes as above liquid pipe detection circuitry, detection module is arranged in treating to hold liquid among the liquid pipe and carries out detection analysis.

Above-mentioned liquid pipe detection circuitry and sample analysis appearance under the condition of pipe liquid detector input power signal, according to the different states of the liquid that hold in waiting to survey the liquid pipe, can generate the current signal of different heights. And then, voltage sampling is carried out through a voltage sampling circuit, a corresponding voltage signal is obtained and sent to an analog-to-digital converter connected with the voltage sampling circuit, the voltage signal is converted into a voltage digital signal through analog-to-digital conversion, and finally the voltage digital signal is transmitted to a processor for analysis to obtain the state information of the liquid in the liquid pipe to be detected. Through above-mentioned scheme, directly adopt analog to digital converter to gather different voltage signal and hold the state information analysis of liquid in waiting to detect the liquid pipe, to the equal ability matching analysis of different voltage digital signal obtain corresponding state information, be suitable for because hold the multiple different state analysis that the colour depth of liquid and whether have the bubble to arouse in waiting to detect the liquid pipe, have the advantage that the detection state is many.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic diagram of a liquid tube detection circuit according to an embodiment;

FIG. 2 is a diagram illustrating a mapping relationship between voltage signals and state information of a fluid contained therein according to an embodiment;

FIG. 3 is a schematic diagram of a liquid tube detection circuit according to another embodiment;

FIG. 4 is a schematic diagram of a liquid tube detection circuit according to yet another embodiment;

fig. 5 is a schematic diagram of a liquid tube detection circuit according to yet another embodiment.

Detailed Description

To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present application are illustrated in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Referring to fig. 1, a liquid tube detection circuit includes: the tube liquid detector 10 is used for generating a current signal corresponding to the state of liquid contained in the liquid tube to be detected according to an input power signal; the voltage sampling circuit 20 is connected with the tube liquid detector 10 and is used for sampling the current signal to obtain a voltage signal; the analog-to-digital converter 30 is connected with the voltage sampling circuit 20 and is used for performing analog-to-digital conversion on the voltage signal to obtain a corresponding voltage digital signal; and the processor 40 is connected with the analog-to-digital converter 30 and used for obtaining the state information of the liquid contained in the liquid pipe to be detected according to the voltage digital signal.

Specifically, the tube liquid detector 10 is a device capable of detecting a liquid state in the liquid tube to be detected, the tube liquid detector 10 provided in this embodiment starts to operate when a power supply signal is input, and in an operation process, current signals of different magnitudes are responded according to states such as whether liquid exists in the liquid tube to be detected, the color depth of the liquid, whether bubbles exist in the liquid, and the like. The voltage sampling circuit 20 is a device capable of sampling and analyzing the current signal and converting the current signal into a voltage signal with a corresponding magnitude. The voltage signal obtained after sampling by the voltage sampling circuit 20 is an Analog signal, and therefore, after the voltage sampling circuit 20 samples the voltage signal according to the corresponding current signal of the tube liquid detector 10, Analog-to-Digital conversion is performed by using an Analog-to-Digital Converter (ADC) 30 to obtain a voltage Digital signal, which is convenient for state analysis of the liquid contained in the subsequent process.

After the analog-to-digital converter 30 converts the voltage signal into a digital voltage signal, the digital voltage signal is transmitted to the processor 40 for analysis and processing, and corresponding state information under the current digital voltage signal, that is, state information of the liquid contained in the liquid pipe to be detected, is directly obtained. It can be understood that, in order to implement mapping of the digital voltage signal to the state information of the liquid contained in the liquid pipe to be tested, in an embodiment, a state database representing a corresponding relationship between the digital voltage signal and the state information is pre-stored in the processor 40, and after the processor 40 receives the voltage digital signal, the processor is directly matched with the state database, and according to a preset voltage digital signal threshold range where the currently acquired voltage digital signal is located, the corresponding state information can be obtained.

It should be noted that the form of the preset status database is not exclusive, and in one embodiment, referring to fig. 2, six sets of preset voltage digital signal threshold ranges may be set according to whether the tube liquid detector 10 is disposed in the liquid tube to be detected, whether the liquid tube to be detected contains liquid, the color of the liquid contained in the liquid tube, whether bubbles exist in the liquid contained in the liquid tube, and the like, where each set of preset voltage digital signal threshold ranges corresponds to one status information. The corresponding six groups of mapping relations are respectively as follows: under the first group of preset voltage digital signal threshold value ranges V1, the state information is empty pipe (that is, the liquid pipe to be detected is not arranged at the pipe liquid detector 10); in the second set of preset voltage digital signal threshold range V2, the status information indicates whether there is liquid in the tube (i.e. the liquid tube to be detected is arranged at the tube-liquid detector 10, but there is no liquid in the liquid tube to be detected); under the third group of preset voltage digital signal threshold value ranges V3, the state information is that a tube is filled with light-colored liquid and bubbles are contained in the liquid; under the fourth group of preset voltage digital signal threshold value ranges V4, the state information is that the liquid is light-colored and has no bubble in the liquid; under a fifth group of preset voltage digital signal threshold value ranges V5, the state information is that dark liquid exists in the liquid, and bubbles exist in the liquid; and under the sixth group of preset voltage digital signal threshold value range V6, the state information is that dark liquid exists in the liquid, and no bubble exists in the liquid. The specific values of V1-V6 can be determined by multiple tests, and finally stored in the processor 40 together with the corresponding state information.

In another embodiment, more corresponding relations between preset voltage digital signal threshold ranges and state information can be further set for storing the color depth and/or the number of bubbles in liquid, and the like. In other embodiments, the preset state information may also be information representing whether a liquid pipe to be detected leaks or not, and the preset state information may be any state information that can be represented by current signals with different magnitudes and responses of the pipe liquid detector 10, and specifically, in the actual use process, what type of state database is specifically adopted, and different settings may be performed according to user requirements.

It should be noted that the specific type of the analog-to-digital converter 30 and the specific type of the processor 40 are not exclusive, for example, in one embodiment, an MCU (Micro Control Unit) may be used as the processor 40, and the analog-to-digital converter 30 may be implemented by an ADS1248 analog-to-digital converter 30.

Referring to fig. 3, in an embodiment, the liquid tube detection circuit further includes a filtering and amplifying circuit 50, and the voltage sampling circuit 20 is connected to the analog-to-digital converter 30 through the filtering and amplifying circuit 50.

Specifically, the filtering and amplifying circuit 50 is a circuit capable of amplifying and filtering the voltage signal output from the voltage sampling circuit 20. In the actual test process, because the current signal phase difference is less when the liquid that holds that the electric current signal that the pipe liquid detector 10 generated is under different states, in order to facilitate follow-up state information analysis, this embodiment will carry out amplification processing to the voltage signal after obtaining the voltage signal. After the voltage sampling or voltage amplification process, some interference components may exist in the voltage signal, and in order to ensure the accuracy of the finally obtained voltage digital signal, the filtering and amplifying circuit 50 is further used to filter the voltage signal in this embodiment.

Referring to fig. 4, in an embodiment, the filter amplifying circuit 50 includes an in-phase filter amplifying circuit 51 and an anti-aliasing filter circuit 52, the in-phase filter amplifying circuit 51 is connected to the voltage sampling circuit 20, the in-phase filter amplifying circuit 51 is connected to the anti-aliasing filter circuit 52, and the anti-aliasing filter circuit 52 is connected to the analog-to-digital converter 30.

Specifically, in the present embodiment, the filtering and amplifying circuit 50 includes two parts, i.e., an in-phase filtering and amplifying circuit and an anti-aliasing filtering circuit, the in-phase filtering and amplifying circuit 51 is an amplifying circuit and a filtering circuit based on an in-phase amplifier, and the anti-aliasing filtering circuit 52 is used for filtering the output of the in-phase filtering and amplifying circuit 51, so as to reduce the aliasing frequency component in the output voltage of the in-phase filtering and amplifying circuit 51 to a negligible degree, and effectively improve the reliability of voltage sampling in the liquid pipe detection circuit.

It should be noted that the specific form of the in-phase filter amplifier circuit 51 and the anti-aliasing filter circuit 52 is not exclusive, and referring to fig. 4 in combination, in an embodiment, the in-phase filter amplifier circuit 51 includes a first amplifier S1, a first resistor R1, a second resistor R2 and a first capacitor C1, a forward input terminal of the first amplifier S1 is connected to the voltage sampling circuit 20, a backward input terminal of the first amplifier S1 is connected to one end of the first resistor R1, one end of the second resistor R2 and one end of the first capacitor C1, the other end of the first resistor R1 is grounded, the other end of the second resistor R2 is connected to the other end of the first capacitor C1 and the output terminal of the first amplifier S1, and an output terminal of the first amplifier S1 is connected to the anti-aliasing filter circuit 52.

Similarly, referring to fig. 4, in an embodiment, the anti-aliasing filter circuit 52 includes a third resistor R3 and a second capacitor C2, one end of the third resistor R3 is connected to the in-phase filter amplifier circuit 51, the other end of the third resistor R3 is connected to one end of the second capacitor C2 and the analog-to-digital converter 30, and the other end of the second capacitor C2 is grounded.

Specifically, after the voltage sampling circuit 20 samples a voltage signal related to the state of the liquid in the liquid tube to be measured, the voltage signal is input from the positive input end of the first amplifier S1, is subjected to in-phase amplification and filtering under the actions of the first amplifier S1, the first resistor R1, the second resistor R2 and the first capacitor C1, is output to the anti-aliasing filter circuit 52 through the output end of the first amplifier S1, is specifically received by the third resistor R3 of the anti-aliasing filter circuit 52, is subjected to anti-aliasing filtering processing through the third resistor R3 and the second capacitor C2, and finally is transmitted to the analog-to-digital converter 30 for analog-to-digital conversion.

Referring to fig. 4, in an embodiment, the filter amplifying circuit 50 further includes a filter capacitor C, one end of the filter capacitor C is connected to the voltage sampling circuit 20 and the in-phase filter amplifying circuit 51, and the other end of the filter capacitor C is grounded.

Specifically, in this embodiment, a filter capacitor C is further disposed between the in-phase filter amplifier circuit 51 and the voltage sampling circuit 20, and the voltage signal sampled by the voltage sampling circuit 20 is first filtered by the filter capacitor C, and then is transmitted to the pass filter amplifier circuit 50 for in-phase amplification and filtering. Therefore, the voltage signal sampled by the voltage sampling circuit 20 is prevented from being directly transmitted to the in-phase filtering and amplifying circuit 51 for amplification, so that the interference component in the voltage signal is also amplified, and the working reliability of the liquid tube detection circuit is further ensured.

Referring to fig. 5, in one embodiment, the liquid tube detection circuit further includes a constant current source driving circuit 60, and the constant current source driving circuit 60 is connected to the liquid tube detector 10.

Specifically, the type of the power signal input by the tube liquid detector 10 is not exclusive, and specifically, the power signal may be a constant current power signal, a constant voltage power signal, or the like, as long as it is ensured that the tube liquid detector 10 can generate different current signals according to different states of the liquid in the liquid tube to be detected under the action of the input power signal. In the present embodiment, the constant current power signal is used as an example for explanation, and in order to ensure that the output current signal of the tube liquid detector 10 can reasonably reflect the state of the liquid in the liquid tube to be detected at the tube liquid detector 10, the input signal of the tube liquid detector 10 must be a constant value. Therefore, in this embodiment, the constant current source driving circuit 60 is provided to ensure that the input current of the tube liquid detector 10 is constant, and under a certain input condition, if the states of the liquid contained in the liquid tube to be detected are different, the corresponding current signals which can cause the effect output of the tube liquid detector 10 are also different, so as to realize the liquid state detection operation of the liquid tube.

It should be noted that the specific form of the constant current source driving circuit 60 is not exclusive, as long as the input of the constant current level signal to the input of the tube liquid detector 10 can be controlled when the user needs to detect the liquid tube. For example, referring to fig. 4, in an embodiment, the constant current source driving circuit 60 includes a second amplifier S2, a switch tube T1 and a fourth resistor R4, a positive input terminal of the second amplifier S2 is connected to the power supply, a negative input terminal of the second amplifier S2 is connected to one end of the fourth resistor R4, the other end of the fourth resistor R4 is grounded, an output terminal of the second amplifier S2 is connected to a control terminal of the switch tube T1, a first terminal of the switch tube T1 is connected to the tube liquid detector 10, and a second terminal of the switch tube T1 is connected to one end of the fourth resistor R4.

Specifically, when the second amplifier S2 is powered on and starts to operate, the output end of the second amplifier S2 outputs a high level or low level signal (which may be designed differently according to the type of the switching tube T1), and under the action of the output signal of the second amplifier S2, the switching tube T1 is in a conducting state, so that the corresponding device in the tube-liquid detector 10 is turned on, and starts to operate under a current signal of a constant magnitude. It is understood that the specific type of the switching tube T1 is not exclusive, and may be a transistor or a MOS transistor, etc., as long as the constant current driving control of the tube liquid detector 10 can be realized. Further, in one embodiment, the switch transistor T1 is an NPN transistor.

Similarly, the specific type of the tube liquid detector 10 is not exclusive, and referring to fig. 4, in an embodiment, the tube liquid detector 10 includes a light emitting diode D and a phototransistor T2, the light emitting diode D and the phototransistor T2 are disposed opposite to an outer wall (not shown) of the liquid tube to be detected, an anode of the light emitting diode D is connected to the power supply, a cathode of the light emitting diode D is connected to the constant current source driving circuit 60, a control terminal of the phototransistor T2 is configured to receive light emitted by the light emitting diode D and transmitted through the liquid tube to be detected, a first terminal of the phototransistor T2 is connected to the voltage sampling circuit 20, and a second terminal of the phototransistor T2 is connected to the power supply.

Specifically, the light emitting diode D is a diode capable of generating light when it is in an energized and conductive state. The phototransistor T2 is a functional crystal with photoelectric conversion, and has many kinds, such as an optical crystal, a laser crystal, a nonlinear optical crystal, an electro-optic crystal, a piezoelectric crystal, a scintillation crystal, a magneto-optic crystal, and the like, and the phototransistor T2 can receive an optical signal and convert the optical signal into an electrical signal.

In the embodiment, the light emitting diode D and the phototransistor T2 are oppositely disposed on the outer wall of the liquid tube to be detected, and light generated by the light emitting diode D passes through the liquid tube to be detected and is transmitted to the control end (i.e., the base) of the phototransistor T2 to be received, so as to be converted into current signals with different magnitudes. In addition, the light generated by the led D may be attenuated or concentrated to different degrees due to different states of the liquid in the liquid tube during the transmission process, so that the intensity of the light finally transmitted to the phototransistor T2 may be different even under the action of the constant current source. When the liquid tube is filled with liquid, the liquid tube is equivalent to a convex lens and has a light condensation effect, at the moment, the light transmitted to the phototransistor T2 is enhanced, and the corresponding current value responded by the phototransistor T2 is also enhanced; when there is a bubble in the liquid tube, the light collection will be directly affected, and the current value of the response of the phototransistor T2 is relatively weak. Moreover, the light transmission is also affected to a certain extent by the color depth of the liquid in the phototransistor T2, and the darker the color of the liquid is, the more the light generated by the light emitting diode D is blocked, and the output current value is relatively smaller at this time; the lighter the color is, the less the light generated by the led D is blocked, and the output current is relatively larger. Therefore, in this embodiment, the light emitting diode D and the phototransistor T2, which are disposed on the outer wall of the liquid tube, respond to different current levels to distinguish different liquid states.

It should be noted that the specific form of the voltage sampling circuit 20 is not exclusive, and referring to fig. 4, in an embodiment, the voltage sampling circuit 20 is a sampling resistor, one end of the sampling resistor is connected to the tube liquid detector 10 and the filter amplifying circuit 50 (specifically, one end of the filter capacitor C connected to the filter amplifying circuit 50), and the other end of the sampling resistor is grounded.

The liquid pipe detection circuit can generate current signals with different heights according to different states of liquid in a liquid pipe to be detected under the condition that the power supply signal is input to the liquid pipe detector 10. And then, voltage sampling is carried out through the voltage sampling circuit 20, a corresponding voltage signal is obtained and is sent to the analog-to-digital converter 30 connected with the voltage sampling circuit 20, the voltage signal is converted into a voltage digital signal through analog-to-digital conversion, and the voltage digital signal is finally transmitted to the processor 40 for analysis to obtain the state information of the liquid in the liquid pipe to be detected. Through above-mentioned scheme, directly adopt analog to digital converter 30 to gather different voltage signal and hold the state information analysis of liquid in waiting to detect the liquid pipe, to the equal ability matching analysis of different voltage digital signal and obtain corresponding state information, be suitable for because hold the multiple different state analysis that the colour depth of liquid and whether have the bubble to arouse in waiting to detect the liquid pipe, have the advantage that the detection state is many.

The utility model provides a sample analyzer, includes detection module and circuit module, and detection module connects circuit module, and circuit module includes like the liquid pipe detection circuitry that each embodiment above shows, and detection module is arranged in treating the liquid pipe and holds liquid and carry out the detection and analysis.

Specifically, the liquid tube detection circuit is as shown in the above embodiments and the accompanying drawings, in this embodiment, the liquid tube detection circuit is used in combination with the corresponding detection module, and the sample detection module is combined with the liquid tube detection circuit to detect the state information of the liquid contained in the liquid tube to be detected, so as to finally realize the operations of component detection and analysis of the liquid contained in the liquid tube. The specific state detection manner of the liquid tube detection circuit is shown in the above embodiments, and is not described herein again.

The sample analyzer can generate current signals with different heights according to different states of liquid contained in a liquid pipe to be detected under the condition that the pipe liquid detector 10 inputs a power supply signal. And then, voltage sampling is carried out through the voltage sampling circuit 20, a corresponding voltage signal is obtained and is sent to the analog-to-digital converter 30 connected with the voltage sampling circuit 20, the voltage signal is converted into a voltage digital signal through analog-to-digital conversion, and the voltage digital signal is finally transmitted to the processor 40 for analysis to obtain the state information of the liquid in the liquid pipe to be detected. Through above-mentioned scheme, directly adopt analog to digital converter 30 to gather different voltage signal and hold the state information analysis of liquid in waiting to detect the liquid pipe, to the equal ability matching analysis of different voltage digital signal and obtain corresponding state information, be suitable for because hold the multiple different state analysis that the colour depth of liquid and whether have the bubble to arouse in waiting to detect the liquid pipe, have the advantage that the detection state is many.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. A liquid tube detection circuit, comprising:

the tube liquid detector is used for generating a current signal corresponding to the state of liquid contained in the liquid tube to be detected according to an input power signal;

the voltage sampling circuit is connected with the tube liquid detector and is used for sampling the current signal to obtain a voltage signal;

the analog-to-digital converter is connected with the voltage sampling circuit and is used for performing analog-to-digital conversion on the voltage signal to obtain a corresponding voltage digital signal;

and the processor is connected with the analog-to-digital converter and used for obtaining the state information of the liquid contained in the liquid pipe to be detected according to the voltage digital signal.

2. The fluid tube detection circuit of claim 1, further comprising a filter and amplifier circuit, wherein the voltage sampling circuit is connected to the analog-to-digital converter through the filter and amplifier circuit.

3. The fluid tube detection circuit according to claim 2, wherein the filter amplifier circuit comprises an in-phase filter amplifier circuit and an anti-aliasing filter circuit, the in-phase filter amplifier circuit is connected to the voltage sampling circuit, the in-phase filter amplifier circuit is connected to the anti-aliasing filter circuit, and the anti-aliasing filter circuit is connected to the analog-to-digital converter.

4. The fluid tube detection circuit according to claim 3, wherein the in-phase filter amplifying circuit comprises a first amplifier, a first resistor, a second resistor and a first capacitor, a forward input end of the first amplifier is connected to the voltage sampling circuit, a reverse input end of the first amplifier is connected to one end of the first resistor, one end of the second resistor and one end of the first capacitor, the other end of the first resistor is grounded, the other end of the second resistor is connected to the other end of the first capacitor and an output end of the first amplifier, and an output end of the first amplifier is connected to the anti-aliasing filter circuit.

5. The fluid tube detection circuit according to claim 3, wherein the anti-aliasing filter circuit comprises a third resistor and a second capacitor, one end of the third resistor is connected to the in-phase filter amplification circuit, the other end of the third resistor is connected to one end of the second capacitor and the analog-to-digital converter, and the other end of the second capacitor is grounded.

6. The liquid pipe detection circuit according to any one of claims 3 to 5, wherein the filter amplifier circuit further comprises a filter capacitor, one end of the filter capacitor is connected to the voltage sampling circuit and the in-phase filter amplifier circuit, and the other end of the filter capacitor is grounded.

7. The fluid tube detection circuit of claim 1, further comprising a constant current source drive circuit connected to the tube fluid detector.

8. The liquid tube detection circuit according to claim 7, wherein the constant current source driving circuit comprises a second amplifier, a switch tube and a fourth resistor, a forward input end of the second amplifier is connected to a power supply, a reverse input end of the second amplifier is connected to one end of the fourth resistor, the other end of the fourth resistor is grounded, an output end of the second amplifier is connected to a control end of the switch tube, a first end of the switch tube is connected to the liquid tube detector, and a second end of the switch tube is connected to one end of the fourth resistor.

9. The liquid pipe detection circuit according to any one of claims 7-8, wherein the liquid pipe detector comprises a light emitting diode and a phototransistor, the light emitting diode and the phototransistor are oppositely disposed on the outer wall of the liquid pipe to be detected, the anode of the light emitting diode is connected to a power supply, the cathode of the light emitting diode is connected to the constant current source driving circuit, the control end of the phototransistor is used for receiving the light emitted by the light emitting diode and transmitted through the liquid pipe to be detected, the first end of the phototransistor is connected to the voltage sampling circuit, and the second end of the phototransistor is connected to the power supply.

10. A sample analyzer, comprising a detection module and a circuit module, wherein the detection module is connected to the circuit module, the circuit module comprises the fluid tube detection circuit according to any one of claims 1-9, and the detection module is used for detecting and analyzing the fluid contained in the fluid tube to be detected.

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