CN105675699A - Portable formaldehyde detector - Google Patents
Portable formaldehyde detector Download PDFInfo
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- CN105675699A CN105675699A CN201410650191.6A CN201410650191A CN105675699A CN 105675699 A CN105675699 A CN 105675699A CN 201410650191 A CN201410650191 A CN 201410650191A CN 105675699 A CN105675699 A CN 105675699A
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Abstract
The present invention discloses a portable formaldehyde detector, including a formaldehyde gas sensor, an amplifying circuit, a filter circuit, a sampling holding circuit, an analog-digital conversion circuit and a microcontroller, the formaldehyde gas sensor is used for converting formaldehyde content into an electrical signal for outputting when air contains formaldehyde gas, the amplifying circuit is used for amplifying the electrical signal, the filter circuit is used for filtering the amplified electrical filter, the analog-digital conversion circuit is used for converting the electrical signal after the sampling holding into a digital signal, the microcontroller is used for receiving the digital signal and processing the inputted digital signal, an output end of the microcontroller is connected with a display, an input end of the microcontroller is connected with a keyboard, and the output end of the microcontroller is connected with a USB interface; and the formaldehyde gas sensor, the microcontroller, the amplifying circuit, the filter circuit, the sampling holding circuit, the analog-digital conversion circuit, the display, the keyboard and the USB interfaces are integrated in a portable box. The portable formaldehyde detector can meet the living needs, and is easy to carry, small in size, light in weight, and cost-effective.
Description
Technical field
The present invention relates to a kind of Portable formaldehyde detection instrument.
Background technology
Formaldehyde Pollution of Indoor Air is relatively big to person health effect, and the method overwhelming majority that standard specifies is chemical analysis, and the means of use are that laboratory analytical instrument mainly has tintometer, spectrophotometer, chemistry titration, gas phase and liquid chromatograph. But these methods effort is time-consuming, cost is high, the low process of automaticity process complicated, most of is that manual operation is difficult to accomplish on-the-spot detection in real time.
Summary of the invention
It is an object of the invention to overcome above-mentioned deficiency of the prior art, it is provided that a kind of Portable formaldehyde detection instrument. This Portable formaldehyde detection instrument disclosure satisfy that living needs, easy to carry, and its volume is little, light weight, and cost performance is high.
For achieving the above object, the technical solution used in the present invention is: a kind of Portable formaldehyde detection instrument, it is characterized in that: include the formaldehyde gas sensor for content of formaldehyde being converted when containing formaldehyde gas in air to signal of telecommunication output, for the amplifying circuit that the described signal of telecommunication is amplified, for the filter circuit that the amplified described signal of telecommunication is filtered, for the described signal of telecommunication after filtered being carried out sampling hold circuit that sampling keeps and for the described signal of telecommunication after sampled maintenance being converted to the analog to digital conversion circuit of digital signal, and for receiving described digital signal the single-chip microcomputer digital signal of input processed according to the data processor of establishment parameter value, described formaldehyde gas sensor connects with the input of amplifying circuit, the outfan of described amplifying circuit connects with the input of filter circuit, the outfan of described filter circuit connects with the input adopting holding circuit, the described outfan of employing holding circuit connects with the input of analog to digital conversion circuit, the outfan of analog-digital conversion circuit as described connects with the input of single-chip microcomputer, the outfan of described single-chip microcomputer is connected to the display for being shown by the result data after single-chip microcomputer processes, the input of described single-chip microcomputer is connected to the keyboard for arranging single-chip microcomputer parameter, the outfan of described single-chip microcomputer is connected to the USB interface for the result data after single-chip microcomputer processes imports computer,Described formaldehyde gas sensor, single-chip microcomputer, amplifying circuit, filter circuit, sampling hold circuit, analog to digital conversion circuit, display, keyboard and USB interface are all integrated on a portable box.
Above-mentioned a kind of Portable formaldehyde detection instrument, it is characterised in that: described single-chip microcomputer adopts ATMEGA64.
Above-mentioned a kind of Portable formaldehyde detection instrument, it is characterised in that: described formaldehyde gas sensor is made up of formaldehyde probe CH20 sensor.
Above-mentioned a kind of Portable formaldehyde detection instrument, it is characterised in that: analog-digital conversion circuit as described adopts chip ADS8341.
Above-mentioned a kind of Portable formaldehyde detection instrument, it is characterised in that: described display is LCD liquid crystal display.
The present invention compared with prior art has the advantage that
1, the simple in construction of the present invention, novel in design reasonable.
2, simple in construction: AD conversion chip of the present invention adopts ADS8341, it is a kind of 16 A/D converters of middling speed four-way, includes clock circuit, only needs an external resistance and an electric capacity just can be provided clock signal by self.
3, memory function: utilize the E2PROM of ATMEGA64 single-chip microcomputer can every time detect the maximum of concentration of formaldehyde by cycle index, it is simple to inquiry.
4, system stability is high, certainty of measurement is high: operational amplifier of the present invention adopts OP07, it has, and input current is little, gain bandwidth, switching rate high, input impedance is high, total harmonic distortion rate is low, the feature of low noise, it is ensured that the steady operation of circuit and system accuracy.
Below by drawings and Examples, technical scheme is described in further detail.
Accompanying drawing explanation
Fig. 1 is the schematic block circuit diagram of the present invention.
Description of reference numerals:
1 formaldehyde gas sensor; 2 amplifying circuits; 3 filter circuits;
4 sampling hold circuits; 5 analog to digital conversion circuits; 6 display;
7 single-chip microcomputers; 8 keyboards; 9 USB interface;
10 computers.
Detailed description of the invention
A kind of Portable formaldehyde detection instrument as shown in Figure 1, including the formaldehyde gas sensor 1 for content of formaldehyde being converted when containing formaldehyde gas in air to signal of telecommunication output, for the amplifying circuit 2 that the described signal of telecommunication is amplified, for the filter circuit 3 that the amplified described signal of telecommunication is filtered, for the described signal of telecommunication after filtered being carried out sampling hold circuit 4 that sampling keeps and for the described signal of telecommunication after sampled maintenance being converted to the analog to digital conversion circuit 5 of digital signal, and for receiving described digital signal the single-chip microcomputer 7 digital signal of input processed according to the data processor of establishment parameter value, described formaldehyde gas sensor 1 connects with the input of amplifying circuit 2, the outfan of described amplifying circuit 2 connects with the input of filter circuit 3, the outfan of described filter circuit 3 connects with the input adopting holding circuit 4, the outfan of described employing holding circuit 4 connects with the input of analog to digital conversion circuit 5, the outfan of analog-digital conversion circuit as described 5 connects with the input of single-chip microcomputer 7, the outfan of described single-chip microcomputer 7 is connected to the display 6 for being shown by the result data after single-chip microcomputer 7 processes, the input of described single-chip microcomputer 7 is connected to the keyboard 8 for arranging single-chip microcomputer 7 parameter, the outfan of described single-chip microcomputer 7 is connected to the USB interface 9 for the result data after single-chip microcomputer 7 processes imports computer 10, described formaldehyde gas sensor 1, single-chip microcomputer 7, amplifying circuit 2, filter circuit 3, sampling hold circuit 4, analog to digital conversion circuit 5, display 6, keyboard 8 and USB interface 9 are all integrated on a portable box.
In the present embodiment, described single-chip microcomputer 7 adopts ATMEGA64. Described formaldehyde gas sensor 1 is made up of formaldehyde probe CH20 sensor. Analog-digital conversion circuit as described 5 adopts chip ADS8341. Described display 6 is LCD liquid crystal display.
The work process of the present invention is: its principle is that oxidation reaction occurs the formaldehyde in air under the electrodes, and the diffusion electrode electric current of generation is directly proportional to the concentration of formaldehyde in air, send single-chip microcomputer 7 by detecting the adjustment of amplifying circuit 2 and amplification after A/D changes. The digital signal of input is processed by single-chip microcomputer 7 according to the data processor of this parameter value of establishment, and result is shown by display 6, and stores the result in E2PROM. When result is printed by needs, select the print button on keyboard. Meanwhile, after batch testing terminates, can data result be imported in computer by the USB interface 9 in system, be processed by the data worked out and analysis program makes further statistical analysis.
AD conversion chip of the present invention adopts ADS8341, and it is a kind of 16 A/D converters of middling speed four-way, includes clock circuit, only needs an external resistance and an electric capacity just can be provided clock signal by self. And having memory function, it utilizes the E2PROM of ATMEGA64 single-chip microcomputer can detect the maximum of concentration of formaldehyde by cycle index, it is simple to inquiry every time. Operational amplifier of the present invention adopts OP07, and it has, and input current is little, gain bandwidth, switching rate high, input impedance is high, total harmonic distortion rate is low, the feature of low noise, it is ensured that the steady operation of circuit and system accuracy.
The above; it it is only presently preferred embodiments of the present invention; not the present invention is imposed any restrictions, every any simple modification, change and equivalent structure transformation above example made according to the technology of the present invention essence, all still fall within the protection domain of technical solution of the present invention.
Claims (5)
1. a Portable formaldehyde detection instrument, it is characterized in that: include the formaldehyde gas sensor (1) for content of formaldehyde being converted when containing formaldehyde gas in air to signal of telecommunication output, for the amplifying circuit (2) that the described signal of telecommunication is amplified, for the filter circuit (3) that the amplified described signal of telecommunication is filtered, for the described signal of telecommunication after filtered being carried out sampling hold circuit (4) that sampling keeps and for the described signal of telecommunication after sampled maintenance being converted to the analog to digital conversion circuit (5) of digital signal, and for receiving described digital signal the single-chip microcomputer (7) digital signal of input processed according to the data processor of establishment parameter value, described formaldehyde gas sensor (1) connects with the input of amplifying circuit (2), the outfan of described amplifying circuit (2) connects with the input of filter circuit (3), the outfan of described filter circuit (3) connects with the input adopting holding circuit (4), the outfan of described employing holding circuit (4) connects with the input of analog to digital conversion circuit (5), the outfan of analog-digital conversion circuit as described (5) connects with the input of single-chip microcomputer (7), the outfan of described single-chip microcomputer (7) is connected to the display (6) for being shown by the result data after single-chip microcomputer (7) processes, the input of described single-chip microcomputer (7) is connected to the keyboard (8) for arranging single-chip microcomputer (7) parameter, the outfan of described single-chip microcomputer (7) is connected to for the USB interface (9) will import computer (10) through the result data after single-chip microcomputer (7) processes,Described formaldehyde gas sensor (1), single-chip microcomputer (7), amplifying circuit (2), filter circuit (3), sampling hold circuit (4), analog to digital conversion circuit (5), display (6), keyboard (8) and USB interface (9) are all integrated on a portable box.
2. a kind of Portable formaldehyde detection instrument according to claim 1, it is characterised in that: described single-chip microcomputer (7) adopts ATMEGA64.
3. a kind of Portable formaldehyde detection instrument according to claim 1, it is characterised in that: described formaldehyde gas sensor (1) is made up of formaldehyde probe CH20 sensor.
4. a kind of Portable formaldehyde detection instrument according to claim 1, it is characterised in that: analog-digital conversion circuit as described (5) adopts chip ADS8341.
5. a kind of Portable formaldehyde detection instrument according to claim 1, it is characterised in that: described display (6) is LCD liquid crystal display.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410650191.6A CN105675699A (en) | 2014-11-16 | 2014-11-16 | Portable formaldehyde detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410650191.6A CN105675699A (en) | 2014-11-16 | 2014-11-16 | Portable formaldehyde detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105675699A true CN105675699A (en) | 2016-06-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410650191.6A Pending CN105675699A (en) | 2014-11-16 | 2014-11-16 | Portable formaldehyde detector |
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| CN (1) | CN105675699A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111398377A (en) * | 2020-04-16 | 2020-07-10 | 北方工业大学 | Gas environment monitoring system and method for rail transit station |
-
2014
- 2014-11-16 CN CN201410650191.6A patent/CN105675699A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111398377A (en) * | 2020-04-16 | 2020-07-10 | 北方工业大学 | Gas environment monitoring system and method for rail transit station |
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Application publication date: 20160615 |
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| WD01 | Invention patent application deemed withdrawn after publication |