CN1916600A - Apparatus for quick measuring content of formaldehyde gas - Google Patents
Apparatus for quick measuring content of formaldehyde gas Download PDFInfo
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- CN1916600A CN1916600A CN 200510028801 CN200510028801A CN1916600A CN 1916600 A CN1916600 A CN 1916600A CN 200510028801 CN200510028801 CN 200510028801 CN 200510028801 A CN200510028801 A CN 200510028801A CN 1916600 A CN1916600 A CN 1916600A
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Abstract
A quick measurement device of methanol content consists of light path unit for using collimator to convert light from light source to be fine parallel beam and for using interference filter to filtering said beams for making them be measurement beam being reflected and translated by prism and colorimetric block, signal process unit for using photoelectric detector to convert light pulse signal to be electric signal, signal processor for converting signal from said detector to be digital signal and microprocessor for processing said digital signal and for outputting measurement result.
Description
Technical field
The present invention relates to surveying instrument, more specifically refer to a kind of rapid measurement device of content of formaldehyde gas, it is mainly used to content of formaldehyde contained in the room air is measured fast.
Background technology
Formaldehyde in the room air is classified as potential danger carcinogenic substance and important environmental contaminants by The World Health Organization (WHO) and USEPA (EPA).Content of formaldehyde gas is listed in the project of must surveying in China's air quality related standards.The formaldehyde measurement instrument is the big class of one in the air quality monitoring instrument.The analytical approach principle of traditional formaldehyde measurement foundation mainly contains spectrophotometric method, electrochemical method, chromatography, fluorescence method and chemoluminescence method etc.
What adopt usually is spectrophotometric method, and She Ji measuring instrument is to utilize formaldehyde and the reaction of certain chemical substance to generate substance that show color according to this, carries out spectrophotometry.This measuring instrument is not disturbed by acetaldehyde when measuring, and simple testing process, good stability, precision are higher.But its shortcoming is that the sample collecting time is longer, and the length of sample collecting time depends on the concentration of content of formaldehyde in the air; The stable colour developing required time of thing of generation then depends on reflection process environment temperature of living in, and environment temperature is low more, generates the time long more (about about 60 minutes) of colour developing thing.Traditional formaldehyde measurement instrument is when measuring, and measuring beam only passes through cuvette once, and measuring beam is shorter with the The interaction distance of colour developing thing, and measurement sensitivity is lower.In the general measurement, the air sampling time is more than 30 minutes, in the lower zone of content of formaldehyde, and nearly one hour of air sampling time.Therefore, the work efficiency of traditional formaldehyde measurement instrument is very low.In addition, traditional formaldehyde measurement instrument also exists environment parasitic light and circuit noise to suppress the relatively poor shortcoming of ability.
Summary of the invention
The objective of the invention is when measuring formaldehyde, to have Measuring Time length, measure the low shortcoming of sensitivity, a kind of rapid measurement device of content of formaldehyde gas is provided at traditional formaldehyde measurement instrument.
To achieve these goals, the present invention adopts following technical scheme:
The rapid measurement device of this content of formaldehyde gas comprises light source, light path part, signal processing.
Described light path part further comprises collimating apparatus, interference filter, first right-angle prism, cuvette, second right-angle prism, the light that collimating apparatus is sent light source is transformed into thin parallel beam, form measuring beam through interference filter element filtering again, measuring beam is by behind the cuvette, returned by reflection of first right-angle prism and translation and the edge direction parallel with former incident direction, once more by cuvette, and by the reflection of second right-angle prism, translation.
Described signal processing comprises photodetector, signal processor, microprocessor, photodetector receives by light path part output light-wave pulse signal and is converted into electric signal, signal processor amplifies the feeble signal of photodetector output and is converted into direct current signal, and microprocessor carries out data processing and exports measurement result the direct current signal that is received.
Described measuring beam is through first right-angle prism and second right-angle prism repeatedly reflects and repeatedly by cuvette, measuring beam outputs to signal processing at last.
Described second right-angle prism is the right-angle prism that an edge is parallel to cuvette and moves perpendicular to beam direction.
Described signal processor comprises driving power, phase delay device, prime amplifier, narrow band filter, correlation integral device, sampling holder, driving power provides power supply for light source on the one hand, on the other hand the square-wave signal of output after suitably postponing, phase delay device is transferred to two input ends of correlation integral device respectively with the first-harmonic sinusoidal signal of narrow band filter output, the direct current signal of correlation integral device output is sent into microprocessor and is carried out data processing behind sampling holder.
Described signal processor comprises prime amplifier, narrow-band filtering, rectifier, prime amplifier amplifies the signal of received photodetector output, and deliver to and carry out filtering and rectification in narrow-band filtering, the rectifier, the signal after filtering, the rectification is delivered to microprocessor and is carried out data processing.
Described light source adopts light emitting diode.
Described photodetector adopts the PIN silicon photoelectric diode.
Store the absorbance-content of formaldehyde calibration curve of standard model in the described microprocessor.
Cuvette places thermostat in the described light path part.
In technique scheme of the present invention, this rapid measurement device has mainly comprised light source, light path part, signal processing, described light path part further comprises collimating apparatus, interference filter, first right-angle prism, cuvette, second right-angle prism, the light that collimating apparatus is sent light source is transformed into thin parallel beam, form measuring beam through interference filter element filtering again, measuring beam is by behind the cuvette, returned by reflection of first right-angle prism and translation and the edge direction parallel with former incident direction, reflect once more by cuvette, and by second right-angle prism, translation; Described signal processing comprises photodetector, signal processor, microprocessor, photodetector receives by light path part output light-wave pulse signal and is converted into electric signal, signal processor amplifies the feeble signal of photodetector output and is converted into digital signal, and microprocessor carries out data processing and exports measurement result received digital signal.This measurement mechanism can carry out the scene to the content of formaldehyde in the room air and measure in real time, when measuring, can be by regulating the position of second right-angle prism, the total length that can make measuring beam pass through cuvette changes, can set sensitivity as required flexibly, measuring beam is high more by the many more measurement sensitivities of number of times of cuvette, measurable greenization compound amount is more little, corresponding content of formaldehyde is more little, that is required air sampling amount is more little, the sampling required time is just short more, thereby has improved the work efficiency of formaldehyde measurement; In addition, this measuring instrument also has has stronger inhibition ability to environment parasitic light and circuit noise.
Description of drawings
Fig. 1 is one of measurement mechanism square frame principle synoptic diagram of the present invention.
Fig. 2 is two of a survey reason device square frame principle synoptic diagram of the present invention.
Fig. 3 for survey of the present invention reason device square frame principle be not intended to three.
Embodiment
Measurement mechanism of the present invention is mainly measured the room air content of formaldehyde according to " the phenol reagent colourimetry " that adopt national standard 107,108 regulations.The measurement base reason of its foundation is: airborne formaldehyde is absorbed by phenol reagent, and reaction generates piperazine, and piperazine is generated the blue-green compound by the ferric ion oxidation in acid solution, use the spectrophotometer colorimetric assay.With the calibration of series standard sample, obtain the absorbance-content of formaldehyde calibration curve of respective standard sample, will measure absorbance and typical curve and relatively determine air content of formaldehyde to be measured.
Please consult earlier shown in Figure 1,
The rapid measurement device of content of formaldehyde gas of the present invention comprises light source 10, light path part 20, signal processing 30.
Described light path part 20 further comprises collimating apparatus 21, interference filter 22, first right-angle prism 23, cuvette 24, second right-angle prism 25, the light that collimating apparatus 21 is sent light source 10 is transformed into thin parallel beam, form measuring beam through interference filter element 22 filtering again, measuring beam is by behind the cuvette 24, returned by 23 reflections of first right-angle prism and translation and the edge direction parallel with former incident direction, once more by cuvette 24, and by 25 reflections of second right-angle prism, translation.Second right-angle prism 25 is one with respect to cuvette 24 parallel mobile right-angle prisms.
In conjunction with shown in Figure 2, described signal processing 30 comprises photodetector 31, signal processor 32, microprocessor 33 again.Photodetector 31 receives by light path part 20 output light-wave pulse signals and is converted into electric signal, the feeble signal of 32 pairs of photodetectors of signal processor, 31 outputs is amplified and is converted into digital signal, and 33 pairs of received digital signals of microprocessor carry out data processing and export measurement result.
Described signal processor 32 comprises driving power 321, phase delay device 322, prime amplifier 323, narrow band filter 324, correlation integral device 325, sampling holder 326.Driving power 321 provides power supply for light source 10 on the one hand, on the other hand the square-wave signal of output after suitably postponing, phase delay device 322 is transferred to two input ends of correlation integral device 325 respectively with the first-harmonic sinusoidal signal of narrow band filter 324 outputs, the direct current signal of correlation integral device 325 outputs is sent into microprocessor 33 and is carried out data processing behind sampling holder 326.
Described light source 10 adopts light emitting diode.
Described photodetector 31 adopts the PIN silicon photoelectric diode.
The concrete course of work of this measurement mechanism is described below, light source 10 is under the driving of driving power 321, the red beam spike train of sending, be transformed into thin parallel beam through collimating apparatus 21, parallel beam interference filter element 22 filtering again, obtain the 630nm measuring beam, measuring beam is by behind the cuvette 24, by 23 reflection and the translations of first right-angle prism, measuring beam returns along the direction parallel with former incident direction, once more by cuvette 24, subsequently, by 25 reflection and the translations of second right-angle prism, measuring beam returns along the direction parallel with incident direction, once more by cuvette 24, in this way, measuring beam is after right-angle prism first right-angle prism 23 and more than 25 reflection of second right-angle prism, measuring beam is repeatedly by cuvette 24, output to photodetector 31 at last, the light wave pulse signal is converted into electric signal in photodetector 31, prime amplifier 323 amplifies the weak signal of photodetector 31 outputs, and by narrow band filter 324 taking-up first-harmonic sinusoidal signals, the square-wave signal that is derived from driving power 321 is transferred to two input ends of correlation integral device 325 respectively with the first-harmonic sinusoidal signal of narrow band filter 324 outputs after phase delay device 322 suitably postpones, the direct current signal of correlation integral device 325 outputs, deliver to microprocessor 33 through sampling holder 326 and carry out data processing, the calibration curve that prestored in microprocessor 33, this calibration curve is the absorbance-content of formaldehyde calibration curve of standard model.Microprocessor 33 compares according to data that sample and calibration curve, can provide measured value very easily.Parasitic light signal of introducing in 325 pairs of measurements of correlation integral device light path and the noise signal in the circuit have very strong inhibiting effect, have improved the sensitivity and the accuracy of measuring, and guarantee the measurement in real time of the measurement mechanism scene of realizing.Regulate the upper-lower position of second right-angle prism 25, the total length that can make measuring beam pass through cuvette 24 increases, and can set sensitivity as required flexibly.Measuring beam is high more by the many more measurement sensitivities of number of times of cuvette 24.Because repeatedly by behind the cuvette 24, the operating distance of light beam in cuvette 24 is multiplied measuring beam, thereby reduces required gas production effectively.Measurable greenization compound amount is more little, and corresponding content of formaldehyde is more little, and the air sampling amount is more little, and the sampling required time is just short more.On the other hand, shorter in order to guarantee developing time, cuvette 24 places thermostat, reduces developing time with this, realizes fast measuring.
Embodiment 2
See also Fig. 1, shown in Figure 3, in this embodiment, measurement mechanism comprises light source 10, light path part 20, signal processing 30 equally.
Described light path part 20 further comprises collimating apparatus 21, interference filter 22, first right-angle prism 23, cuvette 24, second right-angle prism 25, the light that collimating apparatus 21 is sent light source 10 is transformed into thin parallel beam, form measuring beam through interference filter element 22 filtering again, measuring beam is by behind the cuvette 24, returned by 23 reflections of first right-angle prism and translation and the edge direction parallel with former incident direction, once more by cuvette 24, and by 25 reflections of second right-angle prism, translation.Second right-angle prism 25 is one with respect to cuvette 24 parallel mobile right-angle prisms, promptly moves perpendicular to beam direction.
Described signal processing 30 comprises photodetector 31, signal processor 32, microprocessor 33, photodetector 31 receives by light path part 20 output light-wave pulse signals and is converted into electric signal, the feeble signal of 32 pairs of photodetectors of signal processor, 31 outputs is amplified and is converted into digital signal, and 33 pairs of received digital signals of microprocessor carry out data processing and export measurement result.
Please again in conjunction with shown in Figure 3, different is with embodiment 1, and signal processor 32 only comprises prime amplifier 323, narrow-band filtering, rectifier 324, and narrow-band filtering, rectifier 324 not only have the function of filtering, also have the function of rectification.Prime amplifier 323 amplifies the signal of received photodetector 31 outputs, and delivers in narrow-band filtering, the rectifier 324 and carry out filtering and rectification, delivers to microprocessor 33 through the direct current signal after filtering, the rectification and carries out data processing.And the calibration curve that equally also prestored in the microprocessor 33, this calibration curve is the absorbance one content of formaldehyde calibration curve of standard model, its processing procedure has just repeated no more at this with last embodiment.
Introduce the demarcation of the system of reagent preparation, sampling and entire measuring device in the cuvette below again
(1) absorption liquid weighing 0.1g phenol reagent (cobefrin hydrochloride-methyl-2-[4-morpholinodithio ketone hydrazone is called for short MBTH) is dissolved in water, and inclines in the 100mL tool plug graduated cylinder, adds water to 100mL, and stoste is absorbed.Get absorption stoste 5mL, add water 95mL, mixing is absorption liquid.
(2) developer weighing 1.0g ammonium ferric sulfate is used the 0.1mol/L dissolve with hydrochloric acid solution, and is diluted to 100mL, promptly gets the ammonium ferric sulfate solution that concentration is 10g/L.
(3) to measure 2.8mL content be 36%-38% formalin to the formaldehyde standard solution, puts into the 1L volumetric flask, and thin up is to scale.This solution 1mL contains 0.8mg formaldehyde approximately.Na2S2O3 with 0.1000mol/L demarcates its concentration, and adding water to concentration is 1.0 μ g/mL.
(4) sampling is installed in the bubble absorption tube of dress 10mL absorption liquid on the air sampler, sets sampling flow Q=0.5L/min, sets sampling time Δ τ=30min.
With concentration is the formaldehyde standard solution of 1.0 μ g/mL, and according to the form below is mixed with canonical measure liquid series
Table: formaldehyde canonical measure liquid absorbance
| Label | 0 | 1 | 2 | 3 | 4 | 5 |
| Titer volume/mL | 0 | 0.10 | 0.50 | 1.00 | 1.50 | 2.00 |
| Absorption liquid volume/mL | 5.0 | 4.9 | 4.5 | 4.0 | 3.5 | 3.0 |
| Content of formaldehyde/μ g | 0 | 0.1 | 0.5 | 1.0 | 1.5 | 2.0 |
| Absorbance (N=1) | 0 | 0.046 | 0.197 | 0.385 | 0.576 | 0.765 |
| Absorbance (N=3) | 0 | 0.144 | 0.597 | 1.161 | 1.725 | 2.298 |
In each canonical measure liquid, add 0.4mL 1% ammonium ferric sulfate solution, mixing, placement 15min, use the 10mm cuvette, making reference with water, is 630nm with spectrometer beam split wavelength set, regulates the horizontal spacing d of two right-angle prisms of absorption cell, make light beam in the pond, come and go times N=3 o'clock, during the absorbance of measuring canonical measure liquid under the different content of formaldehyde is listed in and shown.Absorbance and its concentration of noticing the colour developing product are proportional, and under the situation that formaldehyde fully reacts, the concentration of absorbance and formaldehyde is proportional, is made as following formula and represents:
A
3＝ξ
3c+ζ
3
(1)
Wherein A3 is an absorbance, and c is a concentration to be measured.According to test result, with least square method try to achieve coefficient ξ 3, ζ 3 is respectively: ξ
3=1.140, ζ
3=0.0185.Regression equation can be written as:
A
3≈1.140c+0.0185
(2)
Can measure equation thus:
c＝0.877A
3-0.0162
(3)
As a comparison, make test beams directly by cuvette, i.e. N=1, the absorbance when recording different content of formaldehyde is also listed in the table 7.3.Its regression equation is:
A
1≈0.381c+0.0044
(4)
c＝2.625A
1-0.0115
(5)
Can learn thus, under the identical absorbance limit, use the air chamber that two right-angle prisms of the present invention constitute after, 1/3rd the when concentration of formaldehyde gas detects and is limited to test beams and directly sees through cuvette, promptly detection sensitivity has improved twice.Under same concentration of formaldehyde, the former can shorten to the latter's 1/3rd in the required sampling time, also can shorten the colour developing required time, thereby can realize fast detecting, increases work efficiency.Further improve round times N and can realize that vestige formaldehyde detects.
To record content of formaldehyde except that promptly getting air formaldehyde concentration (μ g/m3) in sampled air volume (m3).In the application of this example, to the arda sampling 30min that the sheet material with woodwork plate and three-ply board cuts off, sample volume is 15L, and the room temperature during sampling is 23 ℃.Be trapped in the influence of other component to measuring in the air in the absorption liquid when sampling for eliminating, make reference with " blank " sample that does not add developer, absorbance is 1.06, and getting corresponding content of formaldehyde by formula (3) is 0.910 μ g, and gas formaldehyde concentration to be measured is about 0.061mg/m3.Make light beam directly by absorption cell, i.e. N=1, recording absorbance is 0.349, calculating content of formaldehyde according to formula (5) is 0.905 μ g.Notice, under modifier parameter not, absorbance detection limit when light beam repeatedly passes through absorption cell by absorption cell with single is identical, identical absorbance correspondence different content of formaldehyde, light beam is many more by the number of times of absorption cell, corresponding content of formaldehyde is low more, and required sample gas is few more, and it is short more to detect required time.
Those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the present invention, and be not to be used as limitation of the invention, as long as in connotation scope of the present invention, all will drop in claims scope of the present invention variation, the modification of the above embodiment.
Claims (9)
1, a kind of rapid measurement device of content of formaldehyde gas, this measurement mechanism comprises light source, light path part, signal processing, it is characterized in that: described light path part further comprises collimating apparatus, interference filter, first right-angle prism, cuvette, second right-angle prism, the light that collimating apparatus is sent light source is transformed into thin parallel beam, form measuring beam through interference filter element filtering again, measuring beam is by behind the cuvette, returned by reflection of first right-angle prism and translation and the edge direction parallel with former incident direction, reflect once more by cuvette, and by second right-angle prism, translation; Described signal processing comprises photodetector, signal processor, microprocessor, photodetector receives by light path part output light-wave pulse signal and is converted into electric signal, signal processor amplifies the feeble signal of photodetector output and is converted into direct current signal, and microprocessor carries out data processing and exports measurement result the direct current signal that is received.
2, the rapid measurement device of content of formaldehyde gas as claimed in claim 1 is characterized in that: described measuring beam is through first right-angle prism and second right-angle prism repeatedly reflects and repeatedly by cuvette, measuring beam outputs to signal processing at last.
3, the rapid measurement device of content of formaldehyde gas as claimed in claim 1 or 2 is characterized in that: described second right-angle prism is the right-angle prism that an edge is parallel to cuvette and moves perpendicular to beam direction.
4, the rapid measurement device of content of formaldehyde gas as claimed in claim 1, it is characterized in that: described signal processor comprises driving power, phase delay device, prime amplifier, narrow band filter, the correlation integral device, sampling holder, driving power provides power supply for light source on the one hand, on the other hand the square-wave signal of output after suitably postponing, phase delay device is transferred to two input ends of correlation integral device respectively with the first-harmonic sinusoidal signal of narrow band filter output, the direct current signal of correlation integral device output is sent into microprocessor and is carried out data processing behind sampling holder.
5, the rapid measurement device of content of formaldehyde gas as claimed in claim 1, it is characterized in that: described signal processor comprises prime amplifier, narrow-band filtering, rectifier, prime amplifier amplifies the signal of received photodetector output, and deliver to and carry out filtering and rectification in narrow-band filtering, the rectifier, the signal after filtering, the rectification is delivered to microprocessor and is carried out data processing.
6, as the rapid measurement device of claim 1 or 4 or 5 described content of formaldehyde gas, it is characterized in that: described light source adopts light emitting diode.
7, as the rapid measurement device of claim 1 or 4 or 5 described content of formaldehyde gas, it is characterized in that: described photodetector adopts the PIN silicon photoelectric diode.
8, as the rapid measurement device of claim 1 or 4 or 5 described content of formaldehyde gas, it is characterized in that: the absorbance-content of formaldehyde calibration curve that stores standard model in the described microprocessor.
9, the rapid measurement device of content of formaldehyde gas as claimed in claim 1 is characterized in that: cuvette places thermostat in the described light path part.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101625318B (en) * | 2009-08-12 | 2010-11-03 | 南京信息工程大学 | Intelligent indoor gas formaldehyde concentration measuring apparatus |
| CN101793678B (en) * | 2010-02-22 | 2011-12-21 | 天津大学 | Spectrum measuring device and method of scattering substance of sample cell with isosceles triangle cross section |
| CN102854140A (en) * | 2011-06-29 | 2013-01-02 | 施耐德电器工业公司 | Low-energy-consumption detection system |
| CN105424618A (en) * | 2014-09-09 | 2016-03-23 | 赛默飞世尔（上海）仪器有限公司 | Optical detection apparatus with characteristic of sensitivity improving, and optical detection method with characteristic of sensitivity improving |
| CN106153575A (en) * | 2016-07-11 | 2016-11-23 | 中国科学院上海技术物理研究所 | A kind of acousto-optic modulation double light path double detector type near infrared spectrometer and method of testing |
| CN107045040A (en) * | 2016-12-28 | 2017-08-15 | 汪家琳 | Indoor toxic gas automatic detection and purification air interchanger |
| CN110006828A (en) * | 2019-04-26 | 2019-07-12 | 哈尔滨工业大学 | A kind of device and method improving optoacoustic spectroscopy trace-gas sensors performance |
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2005
- 2005-08-15 CN CN 200510028801 patent/CN1916600A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101625318B (en) * | 2009-08-12 | 2010-11-03 | 南京信息工程大学 | Intelligent indoor gas formaldehyde concentration measuring apparatus |
| CN101793678B (en) * | 2010-02-22 | 2011-12-21 | 天津大学 | Spectrum measuring device and method of scattering substance of sample cell with isosceles triangle cross section |
| CN102854140A (en) * | 2011-06-29 | 2013-01-02 | 施耐德电器工业公司 | Low-energy-consumption detection system |
| CN102854140B (en) * | 2011-06-29 | 2015-03-25 | 施耐德电器工业公司 | Low-energy-consumption detection system |
| CN105424618A (en) * | 2014-09-09 | 2016-03-23 | 赛默飞世尔（上海）仪器有限公司 | Optical detection apparatus with characteristic of sensitivity improving, and optical detection method with characteristic of sensitivity improving |
| CN106153575A (en) * | 2016-07-11 | 2016-11-23 | 中国科学院上海技术物理研究所 | A kind of acousto-optic modulation double light path double detector type near infrared spectrometer and method of testing |
| CN107045040A (en) * | 2016-12-28 | 2017-08-15 | 汪家琳 | Indoor toxic gas automatic detection and purification air interchanger |
| CN110006828A (en) * | 2019-04-26 | 2019-07-12 | 哈尔滨工业大学 | A kind of device and method improving optoacoustic spectroscopy trace-gas sensors performance |
| CN110006828B (en) * | 2019-04-26 | 2021-04-23 | 哈尔滨工业大学 | Device and method for improving performance of photoacoustic spectroscopy trace gas sensor |
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