Data acquisition device

Abstract

The utility model relates to the technical field of electronic information data acquisition, in particular to a data acquisition device which comprises a sensor, an amplification module, a filtering module, a data processing module and a detection module, the sensor, the amplification module and the filtering module are electrically connected in sequence, the data processing module and the detection module are both electrically connected with the filtering module, and the detection module is electrically connected with the data processing module. The data processing module is in signal connection with the detection module. The detection module is used for detecting the working condition of the sensor. According to the utility model, the detection module detects the current when the sensor works, whether the sensor works normally is judged through the data processing module, and when the sensor is abnormal, a user is reminded in time, so that the measurement accuracy is ensured.

Description

Technical Field

[0001] This utility model relates to the field of electronic information data acquisition technology, and more specifically, to a data acquisition device. Background Technology

[0002] In today's era of rapid digital development, the accuracy and reliability of data are of paramount importance. Various sensors are widely used in many fields such as industrial production, scientific research experiments, and environmental monitoring to achieve accurate detection of different physical quantities. However, because sensors are in various complex working environments for a long time, they may be affected by factors such as temperature, humidity, and electromagnetic interference, leading to unstable working conditions or even malfunctions.

[0003] If a sensor malfunctions, the collected data may contain errors, which will have a serious negative impact on subsequent data analysis, decision-making, and system control. For example, in industrial automated production, inaccurate sensor data may cause deviations in the production process and affect product quality. In the field of environmental monitoring, erroneous sensor data may mislead the judgment of environmental conditions and prevent timely and effective countermeasures.

[0004] Therefore, in order to ensure the accuracy and reliability of data acquisition, a data acquisition device is needed that can effectively detect whether the sensor is working properly. Utility Model Content

[0005] The purpose of this invention is to provide a data acquisition device to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A data acquisition device includes a sensor, an amplification module, a filtering module, a data processing module, and a detection module. The sensor, the amplification module, and the filtering module are electrically connected in sequence. The data processing module and the detection module are both electrically connected to the filtering module. The data processing module and the detection module are signal connected. The detection module is used to detect the working status of the sensor.

[0008] Preferably, the amplification module includes capacitors C1, C2, C3, and C4, an operational amplifier U1, resistors R1 and R2;

[0009] The first terminals of capacitors C1 and C2 are respectively connected to the two ends of the sensor. The second terminal of capacitor C1 is connected to the non-inverting input terminal of operational amplifier U1, and the second terminal of capacitor C2 is connected to the inverting input terminal of operational amplifier U1. The first terminal of capacitor C3 is connected to the second terminal of capacitor C2, and the second terminal of capacitor C3 is grounded. The first terminal of resistor R1 is connected to the second terminal of capacitor C2, and the second terminal of resistor R1 is grounded. The first terminal of capacitor C4 is connected to the second terminal of capacitor C1, and the second terminal of capacitor C4 is connected to the output terminal of operational amplifier U1. The first terminal of resistor R2 is connected to the first terminal of capacitor C4, and the second terminal of resistor R2 is connected to the second terminal of capacitor C4.

[0010] Preferably, the filtering module includes a resistor R3 and a capacitor C5;

[0011] The first terminal of resistor R3 is the output terminal of operational amplifier U1, the second terminal of resistor R3 is connected to the first terminal of capacitor C5, and the second terminal of capacitor C5 is grounded.

[0012] Preferably, the detection module includes a power supply VCC, resistors R4 and R5, operational amplifier U2, diode D1, resistors R6 and R7, operational amplifier U3, and diode D2.

[0013] The first terminal of resistor R4 is connected to power supply VCC, the second terminal of resistor R4 is connected to the first terminal of resistor R5, and the second terminal of resistor R5 is grounded. The inverting input terminal of operational amplifier U2 is connected to the second terminal of resistor R4, the non-inverting input terminal of operational amplifier U2 is connected to the second terminal of resistor R3, and the output terminal of operational amplifier U2 is connected to the positive terminal of diode D1. The first terminal of resistor R6 is connected to power supply VCC, the second terminal of resistor R6 is connected to the first terminal of resistor R7, and the second terminal of resistor R7 is grounded. The inverting input terminal of operational amplifier U3 is connected to the second terminal of resistor R3, the non-inverting input terminal of operational amplifier U3 is connected to the second terminal of resistor R6, and the output terminal of operational amplifier U3 is connected to the positive terminal of diode D2. The negative terminal of diode D2 is connected to the negative terminal of diode D1. The negative terminal of diode D1 also serves as an output terminal connected to the input port of the data processing module.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] This invention uses a detection module to detect the current of the sensor during operation and a data processing module to determine whether the sensor is working properly. When the sensor malfunctions, it promptly alerts the user to ensure the accuracy of the measurement. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 This is a circuit diagram of the amplification module in the utility model.

[0018] Figure 3 This is a circuit diagram of the filter module in the utility model.

[0019] Figure 4 This is a circuit diagram of the detection module in the utility model.

[0020] In the picture:

[0021] 1. Sensors;

[0022] 2. Amplification module;

[0023] 3. Filtering module;

[0024] 4. Data processing module;

[0025] 5. Detection module. Detailed Implementation

[0026] The technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0027] Please see Figures 1-4 The present invention provides the following technical solution:

[0028] A data acquisition device includes a sensor 1, an amplification module 2, a filtering module 3, a data processing module 4, and a detection module 5. The sensor 1, amplification module 2, and filtering module 3 are electrically connected in sequence. The data processing module 4 and the detection module 5 are both electrically connected to the filtering module 3. The data processing module 4 and the detection module 5 are signal connected. The detection module 5 is used to detect the working status of the sensor 1. The data processing module 4 needs to have built-in analog-to-digital conversion, display, and alarm functions. Common microprocessors can be used. If high-speed data processing is required, a corresponding microprocessor needs to be selected.

[0029] In this embodiment, the amplification module 2 includes capacitors C1, C2, C3, and C4, an operational amplifier U1, resistors R1 and R2;

[0030] The first terminals of capacitors C1 and C2 are connected to the two ends of sensor 1 respectively. The second terminal of capacitor C1 is connected to the non-inverting input terminal of operational amplifier U1, and the second terminal of capacitor C2 is connected to the inverting input terminal of operational amplifier U1. The first terminal of capacitor C3 is connected to the second terminal of capacitor C2, and the second terminal of capacitor C3 is grounded. The first terminal of resistor R1 is connected to the second terminal of capacitor C2, and the second terminal of resistor R1 is grounded. The first terminal of capacitor C4 is connected to the second terminal of capacitor C1, and the second terminal of capacitor C4 is connected to the output terminal of operational amplifier U1. The first terminal of resistor R2 is connected to the first terminal of capacitor C4, and the second terminal of resistor R2 is connected to the second terminal of capacitor C4. Amplification module 2 is an AC-coupled capacitor feedback amplifier circuit. The AC-coupled capacitor feedback amplifier replaces the amplification branch with a smaller capacitor area, which effectively reduces power consumption.

[0031] Specifically, filter module 3 includes resistor R3 and capacitor C5;

[0032] The first terminal of resistor R3 is the output terminal of operational amplifier U1, and the second terminal of resistor R3 is connected to the first terminal of capacitor C5. The second terminal of capacitor C5 is grounded. Filter module 3 is a common low-pass filter circuit, and the cutoff frequency is determined by capacitor C5 and resistor R3.

[0033] Furthermore, the detection module 5 includes power supply VCC, resistor R4, resistor R5, operational amplifier U2, diode D1, resistor R6, resistor R7, operational amplifier U3, and diode D2;

[0034] Resistor R4 is connected to power supply VCC at its first terminal, and to resistor R5 at its second terminal. Resistor R5 is grounded at its second terminal. Operational amplifier U2's inverting input is connected to resistor R4 at its second terminal, and its non-inverting input is connected to resistor R3 at its second terminal. The output of operational amplifier U2 is connected to the positive terminal of diode D1. Resistor R6 is connected to power supply VCC at its first terminal, and to resistor R7 at its second terminal. Resistor R7 is grounded at its second terminal. Operational amplifier U3's inverting input is connected to resistor R3 at its second terminal, and its non-inverting input is connected to resistor R... 6. At the second terminal, the output terminal of operational amplifier U3 is connected to the positive terminal of diode D2, and the negative terminal of diode D2 is connected to the negative terminal of diode D1. The negative terminal of diode D1 also serves as the output terminal connected to the input port of data processing module 4. The voltages at the inverting input terminal of operational amplifier U2 and the non-inverting input terminal of operational amplifier U3 are used as two detection thresholds. The specific thresholds can be determined based on resistors R4, R5, R6, and R7. The voltage at the inverting input terminal of operational amplifier U2 is used as the upper threshold, and the voltage at the non-inverting input terminal of operational amplifier U3 is used as the lower threshold.

[0035] When using the data acquisition device of this utility model, taking temperature measurement as an example, sensor 1 can be a simple thermistor, or other measurement methods can be used. Amplification module 2 is an AC-coupled capacitor feedback amplifier circuit, and filtering module 3 is a low-pass filter circuit. Sensor 1 acquires the temperature signal, which is then amplified by amplification module 2 and filtered by filtering module 3 to remove noise. The signal is then simultaneously transmitted to data processing module 4 and detection module 5. Data processing module 4 needs to have built-in analog-to-digital conversion and display functions. Data processing module 4 converts the signal into a digital signal, which is then displayed through the display function. Detection module 5 is a window comparator. The voltages at the inverting input of operational amplifier U2 and the non-inverting input of operational amplifier U3 serve as two detection thresholds. When the input signal is within the range of the two thresholds, detection module 5 outputs a low level; otherwise, it outputs a high level. Data processing module 4 can use this to determine whether sensor 1 is working properly. Data processing module 4 then reminds the user through display or alarm functions, facilitating timely replacement of sensor 1 and improving detection accuracy.

[0036] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A data acquisition device, comprising a sensor (1), an amplification module (2), a filtering module (3), a data processing module (4), and a detection module (5), characterized in that: The sensor (1), the amplification module (2), and the filtering module (3) are electrically connected in sequence. The data processing module (4) and the detection module (5) are both electrically connected to the filtering module (3). The data processing module (4) and the detection module (5) are signal connected. The detection module (5) is used to detect the working status of the sensor (1). The data processing module (4) has analog-to-digital conversion function and display function. The detection module (5) is a window comparator.

2. The data acquisition device according to claim 1, characterized in that: The amplification module (2) includes capacitors C1, C2, C3, and C4, operational amplifier U1, resistor R1, and resistor R2; The first end of capacitor C1 and the first end of capacitor C2 are respectively connected to the two ends of the sensor (1). The second end of capacitor C1 is connected to the non-inverting input of operational amplifier U1. The second end of capacitor C2 is connected to the inverting input of operational amplifier U1. The first end of capacitor C3 is connected to the second end of capacitor C2. The second end of capacitor C3 is grounded. The first end of resistor R1 is connected to the second end of capacitor C2. The second end of resistor R1 is grounded. The first end of capacitor C4 is connected to the second end of capacitor C1. The second end of capacitor C4 is connected to the output of operational amplifier U1. The first end of resistor R2 is connected to the first end of capacitor C4. The second end of resistor R2 is connected to the second end of capacitor C4.

3. The data acquisition device according to claim 2, characterized in that: The filtering module (3) includes a resistor R3 and a capacitor C5; The first terminal of resistor R3 is the output terminal of operational amplifier U1, the second terminal of resistor R3 is connected to the first terminal of capacitor C5, and the second terminal of capacitor C5 is grounded.

4. The data acquisition device according to claim 3, characterized in that: The detection module (5) includes power supply VCC, resistor R4, resistor R5, operational amplifier U2, diode D1, resistor R6, resistor R7, operational amplifier U3 and diode D2; The first end of resistor R4 is connected to power supply VCC, the second end of resistor R4 is connected to the first end of resistor R5, the second end of resistor R5 is grounded, the inverting input of operational amplifier U2 is connected to the second end of resistor R4, the non-inverting input of operational amplifier U2 is connected to the second end of resistor R3, the output of operational amplifier U2 is connected to the positive terminal of diode D1, the first end of resistor R6 is connected to power supply VCC, the second end of resistor R6 is connected to the first end of resistor R7, the second end of resistor R7 is grounded, the inverting input of operational amplifier U3 is connected to the second end of resistor R3, the non-inverting input of operational amplifier U3 is connected to the second end of resistor R6, the output of operational amplifier U3 is connected to the positive terminal of diode D2, the negative terminal of diode D2 is connected to the negative terminal of diode D1, and the negative terminal of diode D1 is also used as an output terminal connected to the input port of the data processing module (4).

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