CN217424552U - Signal acquisition device and detection system - Google Patents
Signal acquisition device and detection system Download PDFInfo
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- CN217424552U CN217424552U CN202220611293.7U CN202220611293U CN217424552U CN 217424552 U CN217424552 U CN 217424552U CN 202220611293 U CN202220611293 U CN 202220611293U CN 217424552 U CN217424552 U CN 217424552U
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- signal acquisition
- acquisition device
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Abstract
The utility model provides a signal acquisition device and detecting system, signal acquisition device includes photoelectric detector and still includes preceding discharge circuit and signal conditioning circuit, preceding discharge circuit includes: the photoelectric detector, the operational amplifier, the analog switch and the signal conditioning circuit are sequentially connected; the resistors are different in resistance value and are arranged between the photoelectric detector and the analog switch in parallel; the front discharge circuit is disposed in the first shield case. The utility model has the advantages of strong anti-interference ability.
Description
Technical Field
The utility model relates to a signal acquisition, in particular to photoelectric signal collection system and detecting system.
Background
The conventional signal acquisition and processing chain is as follows: the photoelectric sensor outputs a weak current signal; the first stage performs I-V (current-to-voltage) conversion and outputs a voltage signal; the second stage carries out analog filtering to filter clutter signals; the third stage performs signal gain adjustment; the fourth stage carries out ADC (analog-to-digital converter) acquisition; and finally, the MCU (microcontroller) transmits the data to an upper computer at the computer end of the equipment in real time for display analysis. The defects of the scheme mainly lie in that:
1. in an atomic absorption measurement system, a common light source is mostly driven in a high-frequency high-voltage mode, and electromagnetic waves radiated externally easily interfere with an adjacent preposed acquisition system; meanwhile, a primary weak current signal output by the sensor is also easily interfered by pulse groups, static electricity and the like, the influence on a post-stage system is larger as an interference source is closer to the front, and the overall performance is poor in signal-to-noise ratio, so that the measurement index of equipment is directly influenced.
2. In order to improve the sampling resolution, when a signal acquisition system is designed, the gain (signal amplification or signal reduction multiple) of a post-stage conditioning circuit needs to be adjusted according to the range of the output signal of a sensor so as to match the input range of an ADC (analog-to-digital converter), thereby achieving better resolution; this mode is suitable for narrow range measurement systems, and when the measurement range of the instrument needs to be wider, or when different measurement modes (high and low ranges) need to be adapted, the cost of resolution reduction is required.
3. In a conventional measurement system, a microcontroller needs to transmit data (digital signals) acquired in real time to upper computer software on a computer end accurately and reliably, data synchronization is difficult to achieve due to the non-real-time property of a computer operating system, and a certain bit error rate is possibly caused in a relatively severe electrical environment, which is not acceptable.
SUMMERY OF THE UTILITY MODEL
For solving the not enough among the above-mentioned prior art scheme, the utility model provides a signal pickup assembly.
The utility model aims at realizing through the following technical scheme:
a signal acquisition device comprising a photodetector; the signal acquisition device still includes preceding discharge circuit and signal conditioning circuit, preceding discharge circuit includes:
the photoelectric detector, the operational amplifier, the analog switch and the signal conditioning circuit are sequentially connected;
the resistors are different in resistance value and are arranged between the photoelectric detector and the analog switch in parallel;
a first shield case in which the front discharge circuit is disposed.
The utility model also aims at providing a detecting system who uses above-mentioned signal pickup assembly, this invention purpose is realized through following technical scheme:
detecting system, detecting system includes light source, detection pond and first signal acquisition unit, its characterized in that, first signal acquisition unit adopts the utility model discloses a signal acquisition device, photoelectric detector is used for detecting what the light source sent passes the measuring light of detection pond.
Compared with the prior art, the utility model discloses the beneficial effect who has does:
1. the anti-interference capability is strong;
the front-end amplifier circuit and the signal conditioning circuit are both arranged in the shielding shell, so that the anti-interference capability is improved;
2. the adaptation range is large;
in the preamplifier circuit, a plurality of resistors with different resistance values are connected in parallel to realize a switching function, and the adjustable gain amplifier circuit in the signal conditioning circuit is matched with different measurement modes, such as application of wide span range (the difference of the high and low ranges is several orders of magnitude) of absorbance signals.
Drawings
The disclosure of the present invention will become more readily understood with reference to the accompanying drawings. As is readily understood by those skilled in the art: these drawings are only intended to illustrate the technical solution of the present invention and are not intended to limit the scope of the present invention. In the figure:
fig. 1 is a schematic structural diagram of a signal acquisition device according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a detection system according to an embodiment of the present invention.
Detailed Description
Fig. 1-2 and the following description depict alternative embodiments of the invention to teach those skilled in the art how to make and reproduce the invention. For the purpose of explaining the technical solution of the present invention, some conventional aspects have been simplified or omitted. Those skilled in the art will appreciate variations or substitutions from these embodiments that will be within the scope of the invention. Those skilled in the art will appreciate that the features described below can be combined in various ways to form multiple variations of the invention. Accordingly, the present invention is not limited to the following alternative embodiments, but is only limited by the claims and their equivalents.
Example 1:
fig. 1 schematically shows a schematic structural diagram of a signal acquisition device according to an embodiment of the present invention, and as shown in fig. 1, the signal acquisition device includes:
a photodetector 11;
a pre-discharge circuit and signal conditioning circuit 51, the pre-discharge circuit comprising:
the photoelectric detector 11, the operational amplifier 21, the analog switch 31 and the signal conditioning circuit 51 are connected in sequence;
a plurality of resistors 41, the resistors 41 having different resistance values and being arranged in parallel between the photodetector 11 and the analog switch 51;
a first shield case in which the front discharge circuit is disposed.
In order to improve the anti-interference capability, further, the signal acquisition device further includes:
a second shielding case in which the signal conditioning circuit 51 is disposed.
In order to improve the signal-to-noise ratio and the resolution, the signal conditioning circuit 51 further includes a follower circuit, a filter circuit, a gain amplifier, and an analog-to-digital conversion circuit, which are connected in sequence.
Fig. 2 schematically shows a schematic structural diagram of a detection system according to an embodiment of the present invention, and as shown in fig. 2, the detection system includes:
a light source 61, a detection cell 81;
the first signal acquisition unit 91 is the signal acquisition device of this embodiment, and the photodetector 11 is configured to detect the measurement light emitted by the light source 61 and passing through the detection cell 81.
In order to improve the detection accuracy, further, the detection system further comprises:
a beam splitting unit 71, wherein the measuring light is split into reflected light and transmitted light by the beam splitting unit 71, and the transmitted light passes through the detection cell 81 and is received by the photodetector 11;
a second signal collecting unit 92, where the second signal collecting unit 92 adopts the signal collecting device of the embodiment, and a photodetector in the signal collecting device receives the reflected light.
Example 2:
according to the utility model discloses detection system's application example in atomic absorption measurement system of embodiment 1.
In this application example, as shown in fig. 2, the detection system includes:
a light source 61, a detection cell 81;
a beam splitting unit 71, such as a half mirror, for splitting the measuring light into a reflected light and a transmitted light by the beam splitting unit 71, the transmitted light passing through the detection cell 81 and being received by the first signal unit 91, the reflected light being received by the second signal unit 92;
the first signal acquisition unit 91 and the second signal acquisition unit 92 are the same, and as shown in fig. 1, each includes:
photoelectric detector (adopt photodiode), preceding discharge circuit and signal conditioning circuit, preceding discharge circuit includes:
the photoelectric detector 11, the operational amplifier 21, the analog switch 31 and the signal conditioning circuit 51 are connected in sequence;
a plurality of resistors 41, the resistors 41 having different resistance values and being arranged in parallel between the photodetector 11 and the analog switch 31;
the front discharge circuit is arranged in the first shielding shell;
the signal conditioning circuit 51 is arranged in the second shielding shell and comprises a following circuit, a Chebyshev active second-order filter circuit, a programmable gain amplifier and an analog-to-digital conversion circuit which are connected in sequence.
Claims (6)
1. A signal acquisition device comprising a photodetector; characterized in that, signal acquisition device still includes preceding discharge circuit and signal conditioning circuit, preceding discharge circuit includes:
the photoelectric detector, the operational amplifier, the analog switch and the signal conditioning circuit are sequentially connected;
the resistors are different in resistance value and are arranged between the photoelectric detector and the analog switch in parallel;
a first shield case in which the front discharge circuit is disposed.
2. The signal acquisition device of claim 1, further comprising:
a second shielding shell, the signal conditioning circuit disposed within the second shielding shell.
3. The signal acquisition device according to claim 1 or 2, wherein the signal conditioning circuit comprises a follower circuit, a filter circuit, a gain amplifier and an analog-to-digital conversion circuit which are connected in sequence.
4. A signal acquisition device as claimed in claim 3, wherein the filter circuit is a chebyshev active second order filter circuit and the gain amplifier is a programmable gain amplifier.
5. Detection system, detection system includes light source, detection cell and first signal acquisition unit, characterized in that, the signal acquisition device of any one of claims 1-4 is adopted to the first signal acquisition unit, the photoelectric detector is used for detecting the measuring light that passes through the detection cell that the light source sent.
6. The detection system of claim 5, further comprising:
the beam splitting unit is used for splitting the measuring light into reflected light and transmitted light, and the transmitted light passes through the detection cell and is received by the photoelectric detector;
a second signal acquisition unit, said second signal acquisition unit employing the signal acquisition device of any one of claims 1-4, a photodetector in the signal acquisition device receiving said reflected light.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220611293.7U CN217424552U (en) | 2022-03-21 | 2022-03-21 | Signal acquisition device and detection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220611293.7U CN217424552U (en) | 2022-03-21 | 2022-03-21 | Signal acquisition device and detection system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217424552U true CN217424552U (en) | 2022-09-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220611293.7U Active CN217424552U (en) | 2022-03-21 | 2022-03-21 | Signal acquisition device and detection system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217424552U (en) |
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2022
- 2022-03-21 CN CN202220611293.7U patent/CN217424552U/en active Active
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