CN214069891U - Pre-amplification device based on infrared temperature measurement technology - Google Patents
Pre-amplification device based on infrared temperature measurement technology Download PDFInfo
- Publication number
- CN214069891U CN214069891U CN202022435668.2U CN202022435668U CN214069891U CN 214069891 U CN214069891 U CN 214069891U CN 202022435668 U CN202022435668 U CN 202022435668U CN 214069891 U CN214069891 U CN 214069891U
- Authority
- CN
- China
- Prior art keywords
- filter circuit
- stage
- circuit
- temperature measurement
- device based
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
The utility model discloses a preamplification device based on infrared temperature measurement technique, it includes one-level filter circuit, one-level amplifier circuit, second grade filter circuit, second grade amplifier circuit, tertiary filter circuit, infrared sensor is connected to one-level filter circuit, and one-level filter circuit is connected to one-level amplifier circuit, and one-level amplifier circuit is connected to second grade filter circuit, and second grade filter circuit is connected to second grade amplifier circuit, and second grade amplifier circuit is connected to tertiary filter circuit. The beneficial effects of the utility model are that: the signal strength is improved, and meanwhile, the signal precision is ensured; the instrument-dedicated gain-adjustable program-controlled operational amplifier is adopted, and the corresponding amplification factor adjustment can be carried out according to the signal intensity after the MCU collects the signal; the storage device is provided for storing data.
Description
Technical Field
The utility model relates to a preamplification device based on infrared temperature measurement technology belongs to infrared temperature measurement technical field.
Background
The infrared temperature measurement has the advantages of fast response time, non-contact, safe use, long service life and the like, and is widely applied, the infrared temperature measurement is to collect temperature information through an infrared temperature sensor to generate an analog signal, the analog signal is influenced by the environment, has larger noise and extremely low signal intensity, and therefore a preposed amplifying/filtering circuit is needed to process the analog signal. At present, an amplifier is mainly used in the market to build a filtering amplification circuit by using a resistor and a capacitor, the circuit has weak anti-interference capability, the filtering precision and the amplification precision of signals are very low, the amplification factors of the circuit are fixed, and the corresponding adjustment cannot be carried out through the strength of the signals; if the signal strength is too low, the amplification factor is too low, and the signal cannot be read.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in providing a preamplification device based on infrared temperature measurement technique, this amplification device contains the preceding stage and two kinds of back level, input signal is in proper order through first filter circuit, preceding stage amplifier circuit, second time high pass filter circuit, back level amplifier circuit, third filter circuit, adopt twice enlargedly, third time filter, when promoting signal intensity, the precision of signal has been guaranteed, and the amplifier all adopts the programme-controlled fortune of gain adjustable of the special type of instrument to put, can be according to MCU collection signal after, carry out corresponding magnification according to the intensity of signal and adjust.
The utility model discloses a following scheme realizes: a pre-amplification device based on an infrared temperature measurement technology comprises a first-stage filter circuit, a first-stage amplification circuit, a second-stage filter circuit, a second-stage amplification circuit and a third-stage filter circuit, wherein an infrared sensor is connected to the first-stage filter circuit, the first-stage filter circuit is connected to the first-stage amplification circuit, the first-stage amplification circuit is connected to the second-stage filter circuit, the second-stage filter circuit is connected to the second-stage amplification circuit, and the second-stage amplification circuit is connected to the third-stage filter circuit.
And the three-stage filter circuit is connected to the singlechip.
The single chip microcomputer is connected to the storage.
The single chip microcomputer is connected to the output terminal.
The first-stage filter circuit adopts an RC filter.
The primary amplifying circuit adopts a PGA5807 instrument special program control operational amplifier chip, and the frequency of a low-pass filter carried by the chip is set to be 16 Hz.
The second-stage filter circuit adopts an RC high-pass filter.
The second-stage amplifying circuit adopts an AD8253 instrument program control operational amplifier chip.
The three-stage filter circuit adopts an RCL band-pass filter which can pass signals with frequencies of 0.09Hz to 15 Hz.
The utility model has the advantages that:
1. the utility model relates to a preamplification device based on infrared temperature measurement technology contains preceding stage and back stage two kinds, and the input signal passes through the first filter circuit in proper order, preceding stage amplifier circuit, the second time high pass filter circuit, the back stage amplifier circuit, the third filter circuit, adopts twice amplification, the tertiary filtering, when promoting signal intensity, has guaranteed the precision of signal;
2. the amplifier of the pre-amplification device based on the infrared temperature measurement technology adopts the instrument-dedicated gain-adjustable program-controlled operational amplifier, and can perform corresponding amplification factor adjustment according to the signal intensity after the MCU acquires the signal;
3. the utility model relates to a preamplification device based on infrared temperature measurement technique is equipped with the accumulator, can save data.
Drawings
Fig. 1 is a schematic structural diagram of a preamplifier device based on infrared temperature measurement technology.
Detailed Description
The present invention will be further described with reference to fig. 1, but the scope of the present invention is not limited to the description.
In the following description, for purposes of clarity, not all features of an actual implementation are described, well-known functions or constructions are not described in detail since they would obscure the invention with unnecessary detail, it being understood that in the development of any actual embodiment, numerous implementation details must be set forth in order to achieve the developer's specific goals, such as compliance with system-related and business-related constraints, changing from one implementation to another, and it being recognized that such development efforts may be complex and time consuming, but would nevertheless be a routine undertaking for those of ordinary skill in the art.
A preamplifier based on infrared temperature measurement technology comprises a first-stage filter circuit, a first-stage amplifier circuit, a second-stage filter circuit, a second-stage amplifier circuit, a third-stage filter circuit, an infrared sensor is connected to the first-stage filter circuit, the first-stage filter circuit is connected to the first-stage amplifier circuit, the first-stage amplifier circuit is connected to the second-stage filter circuit, the second-stage amplifier circuit is connected to the third-stage filter circuit, the third-stage filter circuit is connected to a single chip microcomputer, the single chip microcomputer is connected to a storage, the single chip microcomputer is connected to an output terminal, the first-stage filter circuit adopts an RC filter, the first-stage amplifier circuit adopts a PGA5807 instrument special program control operational amplifier chip, the frequency of a low-pass filter of the chip is set to be 16Hz, the second-stage filter circuit adopts an RC high-pass filter, the second-stage amplifier circuit adopts an AD8253 instrument program control operational amplifier chip, and the third-stage filter circuit adopts an RCL band-pass filter capable of passing signals with the frequency of 0.09Hz to 15 Hz.
A first-stage filter circuit: and an RC filter is adopted to filter the medium-high frequency interference signals.
A first-stage amplifying circuit: the special program control operational amplifier chip for PGA5807 instruments of TI company is adopted, the frequency of a low-pass filter carried by the chip is set to be 16Hz, and the low-pass filter is connected with a gain control end of the chip through an IO port of an MCU (microprogrammed control unit) in work, so that the purpose of adjusting gain is achieved.
A secondary filter circuit: by adopting the RC high-pass filter, signals with the frequency higher than 0.07Hz can pass through smoothly through calculation.
A secondary amplifying circuit: the AD8253 instrument program control operational amplifier chip of ADI company is adopted to further amplify the signals.
The three-stage filter circuit: with an RCL band pass filter, signals with frequencies of 0.09Hz to 15Hz can be passed.
The operation process of the application is as follows:
firstly, generating an analog signal by an infrared sensor by sensing temperature information;
secondly, filtering the signals above 100Hz through a primary filter circuit;
thirdly, the signal passes through a primary amplifying circuit, the signal intensity is subjected to first gain, the highest gain is set by default, and corresponding gain adjustment is carried out according to the acquired signal in the later stage. Meanwhile, the amplifying circuit carries out low-pass filtering on the signals and filters out the signals higher than 16 Hz;
and fourthly, the signal passes through a secondary filter circuit, the waveform higher than 0.07Hz is reserved through a high-pass filter, and the waveform lower than the waveform is filtered.
And fifthly, the signal is amplified for the second time through a secondary amplifying circuit, so that the MCU can better read and identify. Meanwhile, the default gain is the highest, and the gain is adjusted in the later period according to the signal acquired by the MCU;
and sixthly, the signal passes through a band-pass filter built by the RLC, the signal of 0.09Hz-15Hz is reserved and is transmitted to the signal acquisition IO of the MCU.
Although the invention has been shown and described in detail with respect to the preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. The utility model provides a preamplification device based on infrared temperature measurement technique which characterized in that: the infrared sensor comprises a first-stage filter circuit, a first-stage amplifying circuit, a second-stage filter circuit, a second-stage amplifying circuit and a third-stage filter circuit, wherein the infrared sensor is connected to the first-stage filter circuit, the first-stage filter circuit is connected to the first-stage amplifying circuit, the first-stage amplifying circuit is connected to the second-stage filter circuit, the second-stage filter circuit is connected to the second-stage amplifying circuit, and the second-stage amplifying circuit is connected to the third-stage filter circuit.
2. The pre-amplification device based on the infrared temperature measurement technology as claimed in claim 1, wherein: and the three-stage filter circuit is connected to the singlechip.
3. The pre-amplification device based on the infrared temperature measurement technology as claimed in claim 2, wherein: the single chip microcomputer is connected to the storage.
4. The pre-amplification device based on the infrared temperature measurement technology as claimed in claim 2, wherein: the single chip microcomputer is connected to the output terminal.
5. The pre-amplification device based on the infrared temperature measurement technology as claimed in claim 1, wherein: the first-stage filter circuit adopts an RC filter.
6. The pre-amplification device based on the infrared temperature measurement technology as claimed in claim 1, wherein: the primary amplifying circuit adopts a PGA5807 instrument special program control operational amplifier chip, and the frequency of a low-pass filter carried by the chip is set to be 16 Hz.
7. The pre-amplification device based on the infrared temperature measurement technology as claimed in claim 1, wherein: the second-stage filter circuit adopts an RC high-pass filter.
8. The pre-amplification device based on the infrared temperature measurement technology as claimed in claim 1, wherein: the second-stage amplifying circuit adopts an AD8253 instrument program control operational amplifier chip.
9. The pre-amplification device based on the infrared temperature measurement technology as claimed in claim 1, wherein: the three-stage filter circuit adopts an RCL band-pass filter which can pass signals with frequencies of 0.09Hz to 15 Hz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022435668.2U CN214069891U (en) | 2020-10-28 | 2020-10-28 | Pre-amplification device based on infrared temperature measurement technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022435668.2U CN214069891U (en) | 2020-10-28 | 2020-10-28 | Pre-amplification device based on infrared temperature measurement technology |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214069891U true CN214069891U (en) | 2021-08-27 |
Family
ID=77398240
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022435668.2U Active CN214069891U (en) | 2020-10-28 | 2020-10-28 | Pre-amplification device based on infrared temperature measurement technology |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214069891U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114305404A (en) * | 2021-12-28 | 2022-04-12 | 乐普（北京）医疗器械股份有限公司 | Radiant heat collecting and amplifying circuit and application thereof |
-
2020
- 2020-10-28 CN CN202022435668.2U patent/CN214069891U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114305404A (en) * | 2021-12-28 | 2022-04-12 | 乐普（北京）医疗器械股份有限公司 | Radiant heat collecting and amplifying circuit and application thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4438772A (en) | Differential stethoscope | |
| EP0734223B1 (en) | Medical sensor with amplitude independent output | |
| US4549551A (en) | Heart rate detector | |
| CN214069891U (en) | Pre-amplification device based on infrared temperature measurement technology | |
| CN102160780B (en) | Method and device for improving accuracy of non-invasive blood pressure (NIBP) measurement | |
| Frank et al. | A low cost bluetooth powered wearable digital stethoscope for cardiac murmur | |
| CN213846617U (en) | Low-noise differential amplification filter circuit for high-precision weak signals | |
| CN203416227U (en) | Small signal amplification circuit | |
| CN207624009U (en) | A kind of heart and lung sounds signal identifying system | |
| CN103162839B (en) | Reading circuit for Nb5 N6 normal temperature Terahertz detector linear array | |
| WO2006083180A1 (en) | Ambient light auto-zero circuit for photo-optical physiological monitoring equipment | |
| CN104168524A (en) | Control circuit and control method of digital power amplifier device | |
| CN108771538B (en) | Blood monitoring system | |
| CA1200887A (en) | Differential stethoscope | |
| CN219306713U (en) | Blood oxygen saturation signal control amplifying circuit and noninvasive blood oxygen saturation tester | |
| JPH05220121A (en) | Automatic drift cancel circuit for portable electrocardiogram analyzer | |
| CN220401739U (en) | Signal processing circuit and system | |
| CN214475447U (en) | Ground disaster early warning monitoring instrument based on magnetic sensor | |
| CN219070337U (en) | Circuit structure for acquiring electrocardio and electromyographic signals | |
| CN212811643U (en) | Interactive information management system | |
| CN111077219A (en) | Full-waveform ultrasonic flaw detector | |
| CN206252513U (en) | A kind of different auscultation apparatus of Human Lung beat | |
| CN216751717U (en) | Elastic wave signal acquisition circuit | |
| CN212234433U (en) | Heart rate detection device | |
| CN203933554U (en) | A kind of intelligent ultra-weak electronic signal measurement by magnification system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |