CN214374232U - High sensitivity lift system based on mercury detector - Google Patents
High sensitivity lift system based on mercury detector Download PDFInfo
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- CN214374232U CN214374232U CN202120323085.2U CN202120323085U CN214374232U CN 214374232 U CN214374232 U CN 214374232U CN 202120323085 U CN202120323085 U CN 202120323085U CN 214374232 U CN214374232 U CN 214374232U
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Abstract
The utility model discloses a high sensitivity lift system based on mercury vapor detection appearance, include: the device comprises an excitation light source, an atomizer and a detection system, wherein the excitation light source is provided with a PWM current regulating circuit; the PWM current regulation circuit includes: the atomizer enrichment device comprises a voltage division amplifying circuit consisting of a voltage division resistor R1, a voltage division resistor R2 and an amplifier U, wherein a heating rod is arranged in the atomizer enrichment device and controls the change of temperature by being coupled with a heating rod temperature control circuit; the heating rod temperature control circuit is provided with a voltage comparison circuit which is provided with a comparator; the reverse input end of the comparator is coupled with a thermistor, the same-direction input end of the comparator is coupled with a series voltage division circuit formed by connecting a variable resistor RP2 in series with a voltage division resistor R8 and a voltage division resistor R9, and the detection system is provided with a photoelectric detection circuit for adjusting gain, so that the highest gain is realized, and the interference of external light is removed to the greatest extent.
Description
Technical Field
The utility model relates to a detect technical field, specifically be a high sensitivity lift system based on mercury vapor detection device.
Background
Mercury is a heavy metal pollutant with extremely strong biological toxicity in the environment, the toxicity of the heavy metal pollutant and the toxicity of compounds of the heavy metal pollutant are very high, particularly, organic compounds of mercury have higher toxicity, and are difficult to discharge after entering organisms, so that the health of human beings is seriously threatened, the toxicity of mercury is accumulative and can be reacted for years or decades, the current mercury detection technology is mainly a mercury detector, and the mercury detector on the market is researched to find that the mercury detector has the following defects:
firstly, a high-performance hollow cathode lamp is used as an excitation light source, the lamp needs to adopt large current for maximum lighting, the service life of the hollow cathode lamp is easily shortened, the detection of a mercury detector is easily insensitive due to overlarge current at the later stage of the service life of the hollow cathode mercury lamp, and the fluctuation range of the detected mercury value is large;
secondly, in order to improve the sensitivity of the mercury detector, the enrichment device is internally heated by a heating rod at present, but the temperature of the heating rod is not controlled in the heating process, the heating is not intelligent enough when the heating rod is manually started or disconnected, and the stability and the sensitivity of the enrichment device cannot be kept to the maximum extent;
finally, in the process of mercury-measuring instrument detection, the light source is seriously influenced by the external light environment when being transmitted in the air, other optical noises are doped to interfere the light source, and the highest gain cannot be ensured;
therefore, the prior art can not meet the requirements of people at the present stage, and the innovation of the prior art is urgently needed based on the current situation.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a high sensitivity lift system based on mercury vapor deposition appearance to solve the problem that proposes in the above-mentioned background art.
The utility model provides a mercury-measuring instrument-based high-sensitivity lifting system, which comprises an excitation light source, an atomizer and a detection system;
the excitation light source adopts a hollow cathode lamp, and the excitation light source is provided with a PWM current regulating circuit to realize regulation and control on the current of the hollow cathode lamp.
The PWM current regulation circuit includes: the voltage division amplifying circuit comprises a voltage division resistor R1, a voltage division resistor R2 and an amplifier U, wherein the output end of the voltage division amplifying circuit is coupled with a PWM pulse regulator for controlling the current by pulse, the PWM pulse regulator is coupled with a charging and discharging capacitor C2, the PWM pulse regulator controls the charging or discharging time of a capacitor C2 by a modulation signal input by the voltage division amplifying circuit, the output end of the PWM pulse regulator is coupled with a switching tube Q1 and a switching tube Q2 which alternately work, the PWM pulse regulator controls the switching tube Q1 and the switching tube Q2 to alternately work by outputting a PWM signal, the switching tube Q2 is coupled with an RLC filter circuit consisting of a resistor R4, a capacitor C1 and an inductor L1, and the RLC filter circuit is coupled with a voltage stabilizer which is coupled with a voltage stabilization regulating circuit consisting of an adjustable resistor RP series connection resistor R6;
the current is regulated stably through the PWM current regulating circuit, so that the service life of the hollow cathode lamp is prolonged, the mercury detector is more sensitive in detection by regulating the current, and the fluctuation range of the detected mercury value is very small by stably outputting the current.
A heating rod is arranged in the enrichment device of the atomizer, and the heating rod is coupled with a heating rod temperature control circuit to intelligently control the temperature change, so that the intelligent heating control of the heating rod is realized to the greatest extent, and the gas in the enrichment device is evaporated to the greatest extent;
the heating rod temperature control circuit comprises a voltage comparison circuit, the voltage comparison circuit is provided with a comparator, the reverse input end of the comparator is coupled with a thermistor, the equidirectional input end of the comparator is coupled with a series voltage division circuit formed by a variable resistor RP2 series-connected voltage division resistor R8 and a voltage division resistor R9, and the comparator outputs high level or low level by comparing the high level and the low level of the voltage of the reverse input end and the equidirectional input end; the heating rod temperature control circuit further comprises a heating control circuit formed by coupling a triode VT1 with a relay, the other end of the relay is coupled with the heating rod, the triode is switched on by the heating control circuit according to the high level output by the voltage comparison circuit, the collector of the triode triggers the contact of the relay to work through the high level, and the triode is switched off by the heating control circuit according to the low level output by the voltage comparison circuit, so that the contact of the relay is disconnected to work.
The temperature control circuit of the heating rod effectively controls the temperature of the heating rod, and the stability and the sensitivity of the enrichment device are kept to the maximum extent.
The detection system is provided with a photoelectric detection circuit to process the interference problem of light, other optical noises can be doped to interfere the light source due to the fact that the light source is seriously influenced by the external light environment when the light source is transmitted in the air, the highest gain is guaranteed to be achieved by adjusting the gain through the photoelectric detection circuit, and the interference of the external light is removed to the greatest extent.
The photoelectric detection circuit is provided with a photoelectric converter for converting an optical signal into an electric signal, the output end of the photoelectric converter is coupled with a signal amplification circuit, a little noise exists in the converted electric signal, weak noise is difficult to process, a voltage signal is amplified by the signal amplification circuit for subsequent processing, the signal amplification circuit is provided with a primary amplification circuit and a secondary amplification circuit, gain adjusting resistors are arranged between the reverse input ends and the same-direction output ends of the primary amplification circuit and the secondary amplification circuit, the gain of an amplifier in the signal amplification circuit is determined by the gain adjusting resistors, when weak light is detected, the gain is required to be adjusted to be the maximum as much as possible, but the output voltage of the amplifier is easy to be out of order due to overlarge gain adjustment, so that the converted voltage is uniformly amplified by the two stages of amplification circuits, and the primary amplification circuit, The front input end of the secondary amplifying circuit is respectively provided with a low-pass filter circuit formed by connecting a resistor R13 with a capacitor C5 in parallel and a high-pass filter circuit formed by connecting a capacitor C6 with a resistor R16 in parallel, noise in the converted signal is subjected to low-pass filter processing before being amplified by the primary amplifying circuit and is subjected to high-pass filter processing before being amplified by the secondary amplifying circuit again, and noise interference outside a frequency band in the electric signal is fully removed.
Drawings
FIG. 1 is a block diagram of the present invention;
FIG. 2 is a circuit diagram of the PWM current regulation circuit of the present invention;
FIG. 3 is a circuit diagram of the temperature control of the heating rod of the present invention;
fig. 4 is a diagram of the photoelectric detection circuit of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the utility model provides a field ordinary skilled person does not make all other embodiments that obtain under the creative work prerequisite, all belong to the utility model discloses the scope of protection.
Referring to fig. 1, the utility model provides a following technical scheme a high sensitivity lift system based on mercury vapor detector, include: an excitation light source, an atomizer and a detection system;
the excitation light source adopts a hollow cathode lamp, and in order to prolong the service life of the hollow cathode lamp and keep the light source stable, the excitation light source is provided with a PWM current regulating circuit to realize regulation control on the current of the hollow cathode lamp, so that the fluctuation of the light source is reduced while the maximum output efficiency is ensured.
Referring to fig. 2, the PWM current regulating circuit includes: the voltage division amplifying circuit comprises a voltage division resistor R1, a voltage division resistor R2 and an amplifier U, wherein the output end of the voltage division amplifying circuit is coupled with a PWM pulse regulator for controlling the current by pulse, the PWM pulse regulator is coupled with a charging and discharging capacitor C2, the PWM pulse regulator controls the charging or discharging time of a capacitor C2 by a modulation signal input by the voltage division amplifying circuit, the output end of the PWM pulse regulator is coupled with a switching tube Q1 and a switching tube Q2 which alternately work, the PWM pulse regulator controls the switching tube Q1 and the switching tube Q2 to alternately work by outputting a PWM signal, the switching tube Q2 is coupled with an RLC filter circuit consisting of a resistor R4, a capacitor C1 and an inductor L1, and the RLC filter circuit is coupled with a voltage stabilizer which is coupled with a voltage stabilization regulating circuit consisting of an adjustable resistor RP series connection resistor R6;
when the switching tube Q2 is turned on, the voltage is output to the voltage stabilizer through the RLC filter circuit composed of the resistor R4, the capacitor C1 and the inductor L1, in order to ensure the maximum efficiency of output to the load, the output voltage of the PWM current adjusting circuit should be minimized as much as possible, so that the adjustable resistor RP needs to be adjusted to be close to zero, when the adjustable resistor RP is adjusted to zero, the output current of the voltage stabilizer is smaller than the maximum output current value allowed by the resistor R6 through the series connection of the resistor R6, thereby effectively avoiding the short circuit phenomenon after the adjustable resistor RP is directly zeroed, after the voltage is subjected to voltage division and amplification by the voltage division amplifying circuit, the PWM pulse regulator changes the switching time of the switching tubes Q1 and Q2 by controlling the duty ratio of the output pulse signal, thereby controlling the magnitude of the output current, being capable of ensuring the supply current of the hollow cathode lamp to be maximized, and enabling the output efficiency of the hollow cathode lamp to be maximized, light source fluctuations are reduced.
Referring to fig. 3, a heating rod is arranged in the enrichment device of the atomizer, and the heating rod intelligently controls the change of temperature by coupling with a heating rod temperature control circuit, so as to realize intelligent heating control on the heating rod to the maximum extent and realize maximum evaporation on the gas in the enrichment device;
the heating rod temperature control circuit comprises a voltage comparison circuit, the voltage comparison circuit is provided with a comparator, the reverse input end of the comparator is coupled with a thermistor, the equidirectional input end of the comparator is coupled with a series voltage division circuit formed by a variable resistor RP2 series-connected voltage division resistor R8 and a voltage division resistor R9, and the comparator outputs high level or low level by comparing the high level and the low level of the voltage of the reverse input end and the equidirectional input end; the heating rod temperature control circuit further comprises a heating control circuit formed by coupling a triode VT1 with a relay, the other end of the relay is coupled with the heating rod, the triode is switched on by the heating control circuit according to the high level output by the voltage comparison circuit, the collector of the triode triggers the contact of the relay to work through the high level, and the triode is switched off by the heating control circuit according to the low level output by the voltage comparison circuit, so that the contact of the relay is disconnected to work.
The working process of the heating rod temperature control circuit is as follows: along with the rise of temperature, the resistance value of the thermistor is reduced, when the temperature heated by the heating rod is overhigh, the voltage ratio of the point A is lower, then the voltage of the reverse input end of the comparator is lower, the reference voltage of the same-direction input end of the comparator can be adjusted through adjusting the resistance value of the variable resistor RP2 in series voltage division, namely, the range of the reference voltage of the comparator is controlled by setting the resistance value of the variable resistor, when the voltage of the reverse input end of the comparator is lower than that of the same-direction input end, the output end of the comparator outputs high level, the triode Q1 is conducted, the high level of the base electrode of the triode can directly cause the relay to trigger the heating rod to heat, when the heating rod is continuously heated to be overhigh temperature, the resistance value of the thermistor is reduced, namely the voltage of the point A is reduced, therefore, the voltage of the reverse output end of the comparator is gradually increased until the voltage of the reverse input end of the comparator is higher than that of the same-direction input end of the comparator, the output low level of comparator's output, triode Q1 reverse end leads to the relay to reset and will no longer continue to trigger the heating rod and heat, and the effectual temperature heating control who realizes the heating rod.
Referring to fig. 4, the detection system is provided with a photoelectric detection circuit to solve the problem of light interference, and due to the fact that the light source is seriously influenced by the external light environment when being transmitted in the air, other optical noises are doped to interfere the light source, the gain is adjusted through the photoelectric detection circuit, the highest gain is guaranteed to be achieved, and the interference of the external light is removed to the greatest extent.
The photoelectric detection circuit is provided with a photoelectric converter for converting an optical signal into an electric signal, the output end of the photoelectric converter is coupled with a signal amplification circuit, a little noise exists in the converted electric signal, weak noise is difficult to process, a voltage signal is amplified by the signal amplification circuit for subsequent processing, the signal amplification circuit is provided with a primary amplification circuit and a secondary amplification circuit, gain adjusting resistors are arranged between the reverse input ends and the same-direction output ends of the primary amplification circuit and the secondary amplification circuit, the gain of an amplifier in the signal amplification circuit is determined by the gain adjusting resistors, when weak light is detected, the gain is required to be adjusted to be the maximum as much as possible, but the output voltage of the amplifier is easy to be out of order due to overlarge gain adjustment, so that the converted voltage is uniformly amplified by the two stages of amplification circuits, and the primary amplification circuit, The front input end of the secondary amplifying circuit is respectively provided with a low-pass filter circuit formed by connecting a resistor R13 with a capacitor C5 in parallel and a high-pass filter circuit formed by connecting a capacitor C6 with a resistor R16 in parallel, noise in the converted signal is subjected to low-pass filter processing before being amplified by the primary amplifying circuit and is subjected to high-pass filter processing before being amplified by the secondary amplifying circuit again, and noise interference outside a frequency band in the electric signal is fully removed.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (4)
1. A mercury-meter-based high-sensitivity boost system comprising: excitation light source, atomizer and detecting system, its characterized in that: the excitation light source is provided with a PWM current regulating circuit;
the PWM current regulation circuit includes: the voltage division amplifying circuit consists of a voltage division resistor R1, a voltage division resistor R2 and an amplifier U, and the output end of the voltage division amplifying circuit is coupled with a PWM pulse regulator which controls the current through pulses;
the output end of the PWM pulse regulator is coupled with a switching tube Q1 and a switching tube Q2 which work alternately, and the PWM pulse regulator outputs a PWM signal to control the switching tube Q1 and the switching tube Q2 to work alternately;
the switch tube Q2 is coupled with an RLC filter circuit consisting of a resistor R4, a capacitor C1 and an inductor L1; and the number of the first and second electrodes,
the RLC filter circuit is coupled with a voltage stabilizer, and the voltage stabilizer is coupled with a voltage stabilizing and adjusting circuit consisting of an adjustable resistor RP and a series connection resistor R6;
a heating rod is arranged in the enrichment device of the atomizer, and the heating rod controls the change of temperature by being coupled with a heating rod temperature control circuit;
the heating rod temperature control circuit is provided with a voltage comparison circuit which is provided with a comparator;
the reverse input end of the comparator is coupled with a thermistor, and the same-direction input end of the comparator is coupled with a series voltage division circuit formed by a voltage division resistor R8 and a voltage division resistor R9 which are connected in series through a variable resistor RP 2;
the heating rod temperature control circuit also comprises a heating control circuit which is formed by coupling a triode VT1 with a relay; and the number of the first and second electrodes,
the heating control circuit switches on the triode according to the high level output by the voltage comparison circuit, the collector of the triode triggers the contact of the relay to work through the high level, and the heating control circuit switches off the triode according to the low level output by the voltage comparison circuit and switches off the contact of the relay to work;
the detection system is provided with a photoelectric detection circuit for adjusting the gain, so that the highest gain is realized, and the interference of external light is removed to the greatest extent;
the photoelectric detection circuit is provided with a photoelectric converter for converting an optical signal into an electric signal, and the output end of the photoelectric converter is coupled with the signal amplification circuit;
the signal amplification circuit is provided with a primary amplification circuit and a secondary amplification circuit, and gain adjusting resistors are arranged between the reverse input ends and the same-direction output ends of the primary amplification circuit and the secondary amplification circuit;
the front input ends of the primary amplifying circuit and the secondary amplifying circuit are respectively provided with a low-pass filter circuit formed by connecting a resistor R13 in parallel with a capacitor C5 and a high-pass filter circuit formed by connecting a capacitor C6 in parallel with a resistor R16.
2. The mercury-meter-based high-sensitivity improving system according to claim 1, characterized in that: the PWM pulse regulator is coupled with a charging and discharging capacitor C2, and the PWM pulse regulator controls the charging or discharging time of the capacitor C2 through a modulation signal input by a voltage division amplifying circuit.
3. The mercury-meter-based high-sensitivity improving system according to claim 1, characterized in that: when the adjustable resistor RP is adjusted to zero, the output current of the voltage stabilizer is smaller than the maximum output current value allowed by the resistor R6 through the series connection resistor R6.
4. The mercury-meter-based high-sensitivity improving system according to claim 1, characterized in that: the comparator controls the heating control circuit by comparing the high-low output high level or low level of the voltage of the reverse input end and the voltage of the same-direction input end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120323085.2U CN214374232U (en) | 2021-02-04 | 2021-02-04 | High sensitivity lift system based on mercury detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120323085.2U CN214374232U (en) | 2021-02-04 | 2021-02-04 | High sensitivity lift system based on mercury detector |
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| Publication Number | Publication Date |
|---|---|
| CN214374232U true CN214374232U (en) | 2021-10-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120323085.2U Active CN214374232U (en) | 2021-02-04 | 2021-02-04 | High sensitivity lift system based on mercury detector |
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| Country | Link |
|---|---|
| CN (1) | CN214374232U (en) |
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2021
- 2021-02-04 CN CN202120323085.2U patent/CN214374232U/en active Active
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