CN204422645U - A kind of faint small-signal amplitude detection device - Google Patents
A kind of faint small-signal amplitude detection device Download PDFInfo
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- CN204422645U CN204422645U CN201520160446.0U CN201520160446U CN204422645U CN 204422645 U CN204422645 U CN 204422645U CN 201520160446 U CN201520160446 U CN 201520160446U CN 204422645 U CN204422645 U CN 204422645U
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Abstract
The utility model discloses a kind of faint small-signal amplitude detection device, comprise: faint small-signal early stage processing circuit module, the small-signal full-wave rectifying circuit module that are electrically connected successively, described faint small-signal amplitude detection device also comprises: faint small-signal post-processed circuit module, system feedback circuit module and microprocessor controls circuit module, faint small-signal is by the process of described faint small-signal post-processed circuit module, and the AD conversion through described system feedback circuit module carries out amplitude display by described microprocessor controls circuit module; Wherein, described faint small-signal processing circuit module in early stage comprises: input follow circuit module, ac amplifier circuit module and bandwidth-limited circuit module.The effective faint small-signal being submerged in very noisy medium frequency known detects by the utility model, solve faint small-signal pick-up unit acquisition precision not, can not determine institute's detection signal quality, can only meet particular case under the shortcoming such as testing requirement.
Description
Technical field
The utility model relates to signal amplitude detection field, particularly relates to a kind of faint small-signal amplitude detection device.
Background technology
The object of Detection of Weak Signals extracts useful signal from very noisy, and signal to be detected normally milli/microvolt level.This just needs exigent wave filter could by undesired signal filtering, and it is very difficult to design higher order filter.Traditional faint small-signal detects and mainly carrys out designing filter according to detection signal frequency, the wave filter used assembles by discrete component the filtering system formed, can only adapt to particular case under testing requirement, the requirement of monitoring different small-signal in different environments cannot be met;
In detection feeble signal device, have a kind of typical device as follows:
Chinese patent (the patent No.: 2008100507881, patent name: a kind of apparatus for detecting weak signal) disclose a kind of faint small-signal pick-up unit, it adopts output quantization signal after the analog signal sampling exported signalling channel unit by AD conversion unit after the signal madulation that will detect, amplification and filtering, its Problems existing is: (1) amplifying element does not have peak detection circuit, and what also just cannot ensure that useful signal can be complete passes through amplifying circuit; (2) modulus conversion chip has resolution, and the actual value of the simulating signal of not can completely collection signal channel unit output, has a certain impact to the coherent demodulation in later stage.
In sum, existing apparatus for detecting weak signal still also exist precision not, can not determine the quality of institute's detection signal, the shortcoming such as testing requirement under system can only meet particular case.
Utility model content
The utility model provides a kind of faint small-signal amplitude detection device, solves the quality that faint small-signal pick-up unit acquisition precision is not high, can not determine institute's detection signal, described below:
A kind of faint small-signal amplitude detection device, comprise: faint small-signal early stage processing circuit module, the small-signal full-wave rectifying circuit module that are electrically connected successively, described faint small-signal amplitude detection device also comprises: faint small-signal post-processed circuit module, system feedback circuit module and microprocessor controls circuit module
Faint small-signal is by the process of described faint small-signal post-processed circuit module, and the AD conversion through described system feedback circuit module carries out amplitude display by described microprocessor controls circuit module;
Wherein, described faint small-signal processing circuit module in early stage comprises: input follow circuit module, ac amplifier circuit module and bandwidth-limited circuit module.
Wherein, described input follow circuit module is made up of operational amplifier; Described ac amplifier circuit module is made up of instrument operational amplifier, digital potentiometer and resistance; Described bandwidth-limited circuit module is made up of the cascade of multi-disc filtering chip.
Wherein, described small-signal full-wave rectifying circuit module comprises: phase-shift circuit module and phase sensitive detection circuit module; Described phase sensitive detection circuit module by operational amplifier, resistance and and multi-channel electronic switch form.
Wherein, described faint small-signal post-processed circuit module comprises: low-pass filter circuit module and DC amplification circuit module; The second order active low-pass filter that described low-pass filter circuit module is resistance, electric capacity builds;
Further, described direct current amplification module is made up of operational amplifier, potentiometer and protective resistance.Described system feedback circuit module comprises: peak detection circuit module and A/D Acquisition Circuit module; Described AD Acquisition Circuit module is made up of AD conversion chip.Described bandwidth-limited circuit module adopts MAX262 program control filtering chip.
The beneficial effect of the technical scheme that the utility model provides is: the measured signal frequency that the utility model is inputted by user and-3dB cutoff frequency fc (bandwidth), coupling program control filtering parameter.Adopt peak detection circuit feedack to regulate interchange enlargement factor, the small signal amplitude information through A/D Acquisition Circuit feedback regulates phase sensitive detection circuit parameter, and exports maximum voltage amplitude.The utility model is by modes such as the faint small-signal number of carrying out early stage process, full-wave rectification, post-processed, system feedback, microcontroller adjustments, the effective faint small-signal being submerged in very noisy medium frequency known is detected, and export amplitude and the amplitude effective value of effective faint small-signal, solve faint small-signal pick-up unit acquisition precision not, can not determine institute's detection signal quality, can only meet particular case under the shortcoming such as testing requirement.
Accompanying drawing explanation
Fig. 1 is a kind of structural representation of faint AC signal amplitude detection device;
Fig. 2 is a kind of principle of work schematic diagram of faint AC signal amplitude detection device;
Fig. 3 is a kind of input follow circuit module principle figure of faint AC signal amplitude detection device;
Fig. 4 is a kind of ac amplifier circuit module principle figure of faint AC signal amplitude detection device;
Fig. 5 is a kind of bandwidth-limited circuit module principle figure of faint AC signal amplitude detection device;
Fig. 6 is a kind of phase sensitive detection circuit module principle figure of faint AC signal amplitude detection device;
Fig. 7 is a kind of schematic diagram of low-pass filter circuit module of faint AC signal amplitude detection device;
Fig. 8 is a kind of DC amplification circuit module principle figure of faint AC signal amplitude detection device;
Fig. 9 is a kind of peak detection circuit module principle figure of faint AC signal amplitude detection device;
Figure 10 is a kind of A/D Acquisition Circuit module principle figure of faint AC signal amplitude detection device;
Figure 11 is a kind of data and control bus circuit module schematic diagram of faint AC signal amplitude detection device;
Figure 12 is a kind of digital regulation resistance control circuit figure of faint AC signal amplitude detection device.
In accompanying drawing, the list of parts representated by each label is as follows:
1: faint small-signal processing circuit module in early stage; 2: small-signal full-wave rectifying circuit module;
3: faint small-signal post-processed circuit module; 4: system feedback circuit module;
5: microprocessor controls circuit module; 11: input follow circuit module;
12: ac amplifier circuit module; 13: bandwidth-limited circuit module;
21: phase-shift circuit module; 22: phase sensitive detection circuit module;
31: low-pass filter circuit module; 32: DC amplification circuit module;
41: peak detection circuit module; 42:A/D Acquisition Circuit module;
51: microcontroller; 52: data and control bus circuit module;
53: key circuit module; 54: display circuit module;
55: anti-jamming circuit module.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearly, below the utility model embodiment is described in further detail.
The utility model embodiment provides a kind of faint small-signal amplitude detection device, see Fig. 1 and Fig. 2, this pick-up unit comprises: faint small-signal early stage processing circuit module 1, small-signal full-wave rectifying circuit module 2, faint small-signal post-processed circuit module 3, system feedback circuit module 4 and microprocessor controls circuit module 5.
Wherein, faint small-signal processing circuit module 1 in early stage comprises: input follow circuit module 11, ac amplifier circuit module 12 and bandwidth-limited circuit module 13.
Small-signal full-wave rectifying circuit module 2 comprises: phase-shift circuit module 21 and phase sensitive detection circuit module 22.
Faint small-signal post-processed circuit module 3 comprises: low-pass filter circuit module 31 and DC amplification circuit module 32.
System feedback circuit module 4 comprises: peak detection circuit module 41 and A/D Acquisition Circuit module 42.
Microprocessor controls circuit module 5 comprises: microcontroller 51, data and control bus circuit module 52, key circuit module 53, display circuit module 54 and anti-jamming circuit module 55.
Wherein, input follow circuit module 11 is made up of operational amplifier, and its reverse input end is connected with output terminal, and signal is directly inputted by positive input.
Ac amplifier circuit module 12 is made up of instrument operational amplifier, digital potentiometer and resistance, and digital potentiometer carry is in data and control bus circuit module 52.
Bandwidth-limited circuit module 13 is made up of the cascade of multi-disc filtering chip, and filtering chip carry, in data and control bus circuit module 52, can select multiple filtering chip cascaded-output signal to deliver to the input end of small-signal full-wave rectifying circuit module 2 as required.The measured signal frequency matching filtering parameter that system is inputted by user.
When measured signal frequency is known, system inputs measured signal frequency and-3dB cutoff frequency f by user by key circuit module 53
c(bandwidth), microcontroller 51 is by the parameter of the measured signal parameter Auto-matching bandwidth-limited circuit module 13 of input.
The enlargement factor of ac amplifier circuit module 12 is regulated by peak detection circuit module 41 feedack.
Regulated the parameter of phase sensitive detection circuit module 22 by the small signal amplitude information of A/D Acquisition Circuit module 42 feedback, and export maximum voltage amplitude.
This faint small-signal amplitude detection device is by low-pass filtering module 31 and DC amplification circuit module 32, and the AD conversion through AD Acquisition Circuit module 42 is delivered to display circuit module 54 by microcontroller 51 and shown.
Microprocessor controls circuit module 5 adopts circuits mask, and isolation interference, can monitor supply voltage; Microcontroller 51 controls ac amplifier circuit module 12, bandwidth-limited circuit module 13, phase-shift circuit module 21, DC amplification circuit module 32, AD Acquisition Circuit module 42, key circuit module 53 and display circuit module 54 respectively by control bus.
Phase sensitive detection circuit module 22 by operational amplifier, resistance and and multi-channel electronic switch form, the resistance of operational amplifier two input end cross-over connection two equivalent series, as the tie point of faint small signal modulation circuit output end in the middle of the resistance of series connection, operational amplifier output terminal is connected by a feedback resistance with reverse input end, a signal end of multi-channel electronic switch is connected at the positive input of operational amplifier, another signal end ground connection of multi-channel electronic switch, the control end carry of multi-channel electronic switch is in data and control bus circuit module 52.
The second order active low-pass filter that low-pass filter circuit module 31 is resistance, electric capacity builds.
Direct current amplification module 32 is made up of operational amplifier, potentiometer and protective resistance.Signal is inputted by the positive input of operational amplifier, and cross-over connection potentiometer between output terminal and reverse input end, reverse input end is by resistance eutral grounding.
AD Acquisition Circuit module 42 is made up of AD conversion chip.The negative analog input end grounding of AD conversion chip, positive analog input end connects input signal, and carry is in data and control bus circuit module 52.
See Fig. 3, input follow circuit module 11, connected and composed by single operational amplifier output terminal and reverse input end, its enlargement factor is about 1, its input impedance is high, output impedance is little, can need whole being as far as possible loaded in subsequent processing units circuit of signal S (t) detected.
See Fig. 4, ac amplifier circuit module 12 operational amplifier used is instrument operational amplifier INA129 family chip, and also can calculate the high-amplification-factor amplifier network of amplifier stage joint group one-tenth by common amplifier, its enlargement factor is up to 10000 times.Enlargement factor is determined by the resistance being connected across Rg end, and hold cross-over connection one digital regulation resistance at Rg, digital regulation resistance carry is in data and control bus circuit module 52.By microcontroller 51 control figure potentiometer output resistance, determine the enlargement factor of amplifier.
See Fig. 5, the core parts of bandwidth-limited circuit module 13 are MAX262 program control filtering chips, and MAX262 chip is two second order universal switch electric capacity active filters.Connected by electronic switch as shown in Figure 5 by multi-disc MAX262 chip, can form higher order filter, the output terminal of every sheet MAX262 chip is connected with electronic switch, is selected the port of output filtering signal by electronic switch.The control end correspondence of electronic switch connects the output terminal of latch, and latch carry is in data and control bus circuit module 52.Interface is corresponding with latch interface as shown in the figure connects for the setting of MAX262 chip data, and latch carry is in data and control bus circuit module 52.Data setting interface employing latch lattice network for multi-disc MAX262 chip can reduce the waste to microcontroller 51 pin.Below the concrete enforcement work one of bandwidth-limited circuit module 13 is described in detail: 4 74HC573 series latch chip, 8 CD4066 electronic switches, 3 MAX262 program control filtering chips.Latching in chip 4 74HC573 series selects a slice (the 4th) as to filtering chip data write use, is left the control end C that 3 74HC573 series latch 8 CD4066 electronic switches that chip output connects respectively.The output terminal of electronic switch connects input, the output terminal of wave filter according to the circuit numbers correspondence shown in Fig. 5.4 74HC573 series latch chip enable ends and data input pin are connected to control bus and the data bus of microcontroller 31 according to label correspondence as shown in Figure 5.3 MAX262 filtering chip Enable Pins are connected to the control bus of microcontroller 51 according to label correspondence as shown in Figure 5.
See Fig. 6, phase sensitive detection circuit module 22 is made up of operational amplifier, resistance and electronic switch.See Fig. 7, low-pass filter circuit module 31 has the Hz noise being about 50Hz after detection, and itself and direct current all-wave together export from phase-sensitive detection circuit, therefore need the undesired signal of filtering 50Hz.
See Fig. 8, circuits of direct current amplifier module 32 is formed primarily of digital regulation resistance (Figure 12), operational amplifier.By the resistance (feedback resistance) between output terminal RDAC3, RDAC4 of bus marco digital potentiometer, change direct current amplifier enlargement factor.
See Fig. 9, voltage holding capacitor C4 in peak detection circuit module 41 is connected with operational amplifier output terminal with series diode D2 after resistance R10 parallel connection, by resistance R10 ground connection, the inverting input of operational amplifier and output terminal cross-over connection diode D1, the positive input of voltage follower (forming to operational amplifier after peak detection circuit module 41) is connected with diode D2 output terminal, cross-over connection one resistance R11 between voltage follower reverse input end and operational amplifier reverse input end.Connect an A/D conversion chip at voltage follower output terminal and gather crest voltage, A/D conversion chip connects data and control bus circuit module 52.
Be made up of A/D conversion chip see Figure 10, A/D Acquisition Circuit module 42, A/D conversion chip directly gathers the voltage that direct current amplifier exports, and microcontroller 51 is by data bus access A/D chip.
See Figure 11, microcontroller 51 is by S [0..7], Data [0..3] bus obtain feedback information, by C [0..7], Data [4..11] and r (t) bus marco peripheral components as shown in the figure.
Wherein, anti-jamming circuit module 55, by X25045 chip design, can be monitored supply voltage, and when microcontroller 51 enters endless loop, microcontroller 51, the X25045 chip reset signal output pin that can reset connects the reset pin of microcontroller 51.Voltage end resistance R12, R13 of X25045 chip need to set according to detected voltage, and technician can sets itself.
The utility model embodiment is to the model of each device except doing specified otherwise, and the model of other devices does not limit, as long as can complete the device of above-mentioned functions.
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, above-mentioned the utility model embodiment sequence number, just to describing, does not represent the quality of embodiment.
The foregoing is only preferred embodiment of the present utility model, not in order to limit the utility model, all within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection domain of the present utility model.
Claims (6)
1. a faint small-signal amplitude detection device, comprise: faint small-signal early stage processing circuit module, the small-signal full-wave rectifying circuit module that are electrically connected successively, it is characterized in that, described faint small-signal amplitude detection device also comprises: faint small-signal post-processed circuit module, system feedback circuit module and microprocessor controls circuit module
Faint small-signal is by the process of described faint small-signal post-processed circuit module, and the AD conversion through described system feedback circuit module carries out amplitude display by described microprocessor controls circuit module;
Wherein, described faint small-signal processing circuit module in early stage comprises: input follow circuit module, ac amplifier circuit module and bandwidth-limited circuit module.
2. one according to claim 1 faint small-signal amplitude detection device, is characterized in that,
Described input follow circuit module is made up of operational amplifier;
Described ac amplifier circuit module is made up of instrument operational amplifier, digital potentiometer and resistance;
Described bandwidth-limited circuit module is made up of the cascade of multi-disc filtering chip.
3. one according to claim 1 faint small-signal amplitude detection device, is characterized in that, described small-signal full-wave rectifying circuit module comprises: phase-shift circuit module and phase sensitive detection circuit module;
Described phase sensitive detection circuit module by operational amplifier, resistance and and multi-channel electronic switch form.
4. one according to claim 1 faint small-signal amplitude detection device, is characterized in that, described faint small-signal post-processed circuit module comprises: low-pass filter circuit module and DC amplification circuit module;
The second order active low-pass filter that described low-pass filter circuit module is resistance, electric capacity builds;
Described DC amplification circuit module is made up of operational amplifier, potentiometer and protective resistance.
5. one according to claim 1 faint small-signal amplitude detection device, is characterized in that, described system feedback circuit module comprises: peak detection circuit module and A/D Acquisition Circuit module;
Described AD Acquisition Circuit module is made up of AD conversion chip.
6. one according to claim 2 faint small-signal amplitude detection device, is characterized in that, described bandwidth-limited circuit module adopts MAX262 program control filtering chip.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520160446.0U CN204422645U (en) | 2015-03-18 | 2015-03-18 | A kind of faint small-signal amplitude detection device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520160446.0U CN204422645U (en) | 2015-03-18 | 2015-03-18 | A kind of faint small-signal amplitude detection device |
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| CN204422645U true CN204422645U (en) | 2015-06-24 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105116217A (en) * | 2015-09-02 | 2015-12-02 | 盐城工学院 | Single-chip microcomputer-based weak signal frequency and phase automatic detection system and detection method thereof |
| CN109342916A (en) * | 2018-08-29 | 2019-02-15 | 昆明理工大学 | A kind of modulation detection circuit device based on microcontroller |
| CN110987850A (en) * | 2019-11-27 | 2020-04-10 | 山东航天电子技术研究所 | Method for measuring small signal of sensor |
| CN112782507A (en) * | 2020-12-30 | 2021-05-11 | 苏州中科先进技术研究院有限公司 | STM 32-based weak electronic signal capturing and collecting system |
| CN117805466A (en) * | 2023-12-27 | 2024-04-02 | 珠海多创科技有限公司 | Weak current signal detection method, weak current signal detection device, topology identification device and station area identification system |
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2015
- 2015-03-18 CN CN201520160446.0U patent/CN204422645U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105116217A (en) * | 2015-09-02 | 2015-12-02 | 盐城工学院 | Single-chip microcomputer-based weak signal frequency and phase automatic detection system and detection method thereof |
| CN109342916A (en) * | 2018-08-29 | 2019-02-15 | 昆明理工大学 | A kind of modulation detection circuit device based on microcontroller |
| CN109342916B (en) * | 2018-08-29 | 2022-04-12 | 昆明理工大学 | Amplitude modulation detection circuit device based on microcontroller |
| CN110987850A (en) * | 2019-11-27 | 2020-04-10 | 山东航天电子技术研究所 | Method for measuring small signal of sensor |
| CN112782507A (en) * | 2020-12-30 | 2021-05-11 | 苏州中科先进技术研究院有限公司 | STM 32-based weak electronic signal capturing and collecting system |
| CN117805466A (en) * | 2023-12-27 | 2024-04-02 | 珠海多创科技有限公司 | Weak current signal detection method, weak current signal detection device, topology identification device and station area identification system |
| CN117805466B (en) * | 2023-12-27 | 2024-05-17 | 珠海多创科技有限公司 | Weak current signal detection method, weak current signal detection device, topology identification device and station area identification system |
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