CN100430702C - Ultraviolet index monitor - Google Patents

Abstract

The present invention relates to an ultraviolet index monitoring apparatus which comprises head part receiving and amplifying parts of an ultraviolet signal and a temperature signal, wherein a Schottky ultraviolet detector matched with a red spot response curve can be connected with the input end of a preamplifying circuit. A temperature sensor is connected with the input end of a signal amplifying circuit. The present invention also comprises the output end of a main machine, which is used for an analog-to-digital converting circuit for carrying out the analog-to-digital conversion for a signal and is respectively connected with the head part preamplifying circuit and the signal amplifying circuit, the output end which is used for a single chip computer controlling circuit which finishes data processing and temperature compensation and is connected with the analog-to-digital converting circuit and a displaying circuit for displaying a measured result. A measured ultraviolet ray index is displayed in the colored cylindrical form, and a software program compares processed data with the ultraviolet index data scaled in advance, and after corresponding temperature compensation data is searched, a final real-time ultraviolet ray index value and a temperature value can be obtained, and then are sent to an LED lattice screen and a cylindrical colored lamp to display the ultraviolet ray index and the temperature.

Description

A kind of ultraviolet index monitor

Technical field

The present invention relates to measuring technique, particularly relate to a kind of measuring technique of ultraviolet index.

Background technology

General traditional uv measurement instrument uses optical filter to mate a series of problems that the erythema curve is brought, as mate accuracy be difficult to control, use multiple optical filter that volume is increased, some spectrum is difficult to filter or the like problem, causes measurement accuracy to be difficult to guarantee.And reduced requirement to metering circuit.

Summary of the invention

At the defective that exists in the above-mentioned prior art, it is little that technical matters to be solved by this invention provides a kind of volume, reliability height, measuring accuracy height, convenient, can monitor in real time and forecast and the ultraviolet index monitor that saved optical filter of measurement.

In order to solve the problems of the technologies described above, a kind of ultraviolet index monitor provided by the present invention is characterized in that, comprising:

One hardware circuit part is made up of head and main frame two parts, wherein,

One head part is used for the reception and the amplification of UV signal and temperature signal; Comprising:

One Schottky ultraviolet detector connects the input end of pre-amplification circuit;

One temperature sensor connects the input end of signal amplification circuit;

One host machine part, comprising:

One analog to digital conversion circuit is used for the analog to digital conversion of signal, connects the pre-amplification circuit of head and the output terminal of signal amplification circuit respectively;

One single chip machine controlling circuit is used to finish data processing and temperature compensation, connects the output terminal of analog to digital conversion circuit;

One display circuit is used for the demonstration of measurement result, and shows the ultraviolet index of measuring with the form of colored column, and its definitions of color meets the relevant regulations of The World Health Organization (WHO), connects the demonstration output terminal of single chip machine controlling circuit;

The software program of single-chip microcomputer compares data after handling and prior ultraviolet index data of having calibrated, and after searching corresponding temperature compensation data, can obtain final real-time ultraviolet index value and temperature value, deliver to LED dot matrix screen then and the column color lamp carries out the demonstration of ultraviolet index and temperature.

Further, described head is a can, and box top ultraviolet ray inlet is provided with hemispheric quartz glass cover and teflon diffuse transmission plate, is provided with the Schottky ultraviolet detector in the box, the inwall blacking of box shell.

Further, the second amplifying circuit formed by precision operational-amplifier of described pre-amplification circuit.

Further, the flow process of described scm software program:

1) initialization;

2) carry out the A/D conversion, obtain temperature and ultraviolet total intensity;

3) calculate current temperature value;

4) table look-up and obtain temperature compensation coefficient;

5) calculate ultraviolet index;

6) demonstration comprises information such as temperature, ultraviolet index;

In the subroutine, comprise configuring ports and AD conversion chip control port when serial ports 0 control column color lamp shows ultraviolet index the configuration subroutine, send subroutine, the serial ports 0 control column color lamp of data communication subroutine, AD conversion portion to show that subroutine, the column color lamp display subroutine of ultraviolet index, the literal of ultraviolet index download etc. by serial ports 0 to the column color lamp.

Utilize ultraviolet index monitor provided by the invention,, when measuring ultraviolet index, can save the requirement that increases optical filter, can directly measure easily owing to use the GaN ultraviolet Schottky detector that is complementary with the erythema curve.Making is one of direction of following ultraviolet index measurement in this way, and it is reducing the volume of instrument, increases instrument reliability, improves the aspects of measuring such as precision and has all manifested very outstanding advantage.Simultaneously, be convenient to promote in ultraviolet meteorological research field.The instrument light and flexible can be used in multiple occasion, is particularly suitable for using in meteorological department, and can shows forecast in public.

Description of drawings

Fig. 1 is an embodiment of the invention ultraviolet index monitor theory diagram;

Fig. 2 is the head construction sketch of embodiment of the invention ultraviolet index monitor;

Fig. 3 is the UV signal collection and the amplifying circuit schematic diagram of embodiment of the invention head;

Fig. 4 is the temperature acquisition and the amplification module circuit theory diagrams of embodiment of the invention head;

Fig. 5 is the host machine part circuit theory diagrams of embodiment of the invention ultraviolet index monitor;

Fig. 6 is the program flow chart of embodiment of the invention ultraviolet index monitor;

Fig. 7 is the interior measured Fluorescent Magnetic Flaw Detector of solar spectrum and the curve map of erythema effect;

Fig. 8 is the curve map that is subjected to the total Fluorescent Magnetic Flaw Detector after the erythema spectrally-weighted;

Fig. 9 is the spectral response curve figure of Schottky ultraviolet detection device.

Embodiment

Below in conjunction with description of drawings embodiments of the invention are described in further detail, but present embodiment is not limited to the present invention, every employing analog structure of the present invention and similar variation thereof all should be listed protection scope of the present invention in.

Referring to shown in Figure 1, a kind of ultraviolet index monitor that the embodiment of the invention provided comprises:

One hardware circuit part is made up of head and main frame two parts, wherein,

One head part is used for the reception and the amplification of UV signal and temperature signal; Comprising:

One can be connected the input end of pre-amplification circuit (OPA111) with the Schottky ultraviolet detector of erythema response curve coupling;

One temperature sensor (AD590) connects the input end of signal amplification circuit (LF353);

Hardware circuit part also comprises;

One host machine part is used for conversion, compensation, processing, the demonstration of signal; Comprising:

One analog to digital conversion circuit (8 A/D conversion chip MAX154) is used for the analog to digital conversion of signal, connects the pre-amplification circuit of head and the output terminal of signal amplification circuit respectively;

One single chip machine controlling circuit (high-speed microprocessor DS87C520) is used to finish data processing and temperature compensation, connects the output terminal of analog to digital conversion circuit;

One display circuit (128 * 48 dot matrix LED display and column color lamp display) is used for the demonstration of measurement result, and shows the ultraviolet index of measuring with the form of colored column, and its definitions of color meets the relevant regulations of The World Health Organization (WHO).And can be under current ultraviolet index, the display alarm public's relevant information in the LED display curtain;

The software program of single-chip microcomputer compares data after handling and prior ultraviolet index data of having calibrated, and after searching corresponding temperature compensation data, can obtain final real-time ultraviolet index value and temperature value, deliver to 128 * 48 matrix LED dot matrix screens and column color lamp then and carry out the demonstration of ultraviolet index and temperature;

Referring to shown in Figure 2, the head of ultraviolet index monitor is a can, and box top ultraviolet ray inlet is provided with hemispheric quartz glass cover 1 and teflon diffuse transmission plate 2, is provided with Schottky ultraviolet detector 3 in the box, the inwall blacking of shell 4.

Referring to shown in Figure 1, the principle of work of ultraviolet index monitor: when ultraviolet index monitor is worked, hemispheric quartz glass cover 1 and teflon diffuse transmission plate 2 that sunshine sees through head (as shown in Figure 2) arrive Schottky ultraviolet detector 3, the inwall blacking of shell 4, the Schottky ultraviolet detector is because its visible light and infrared light rejection ratio are very high, so only receive the UV radiation of the sun, produce small photocurrent; Simultaneously, temperature sensor AD 590 reflects the variation of ambient temperature by the current changing rate of 1 μ A/K.UV signal and temperature signal are after amplifier amplifies, carry out analog to digital conversion by MAX154, send into single-chip microcomputer DS87C520, because the spectral response curve and the erythema curve of Schottky ultraviolet detection device are complementary (so the signal that produces the resulting result of (1) formula in the calculating of ultraviolet index) just, so just save needs and increased the trouble that optical filter mates, when single-chip microcomputer compares these numerals and prior ultraviolet index data of having calibrated, and after searching corresponding temperature compensation data, just can obtain final real-time ultraviolet index value and temperature value, deliver to 128 * 48 matrix LED dot matrix screens and column color lamp then and carry out the demonstration of ultraviolet index and temperature, simultaneously, can also roll display below LED dot matrix screen under this ultraviolet index grade, the public corresponding the sun-proof measure that should take, as put suncream on the skin, wear caftan, wear sunglasses, beat parasols etc., cause the skin sunburn to prevent excessive ultraviolet radiation.

The collection of ultraviolet index monitor head UV signal and amplifying circuit are as shown in Figure 3.Among Fig. 3, S1 is a Schottky ultraviolet detection device, and IC1 is the monolithic precision operational-amplifier OPA111 of low bias current, and V+, V-are from the low noise mu balanced circuit, and R13 is a high resistant, and its impedance is 1.2 * 10 ¹¹Ω, the voltage signal that IC3 comes prime carry out secondary and amplify, and regulate the enlargement factor that multi-turn precision resistor RV1 can change second level amplifying circuit, so that the output voltage amplitude of whole amplifying circuit is fit to the needs of modulus conversion chip MAX154.For reducing various interference, in amplifying circuit, taked several different measures such as shielding to improve the precision of amplifying circuit.

Temperature acquisition and amplifying circuit principle are referring to shown in Figure 4, because the spectral response characteristic of Schottky Ultraviolet sensor is not only relevant with the ultraviolet light wavelength of incident, but also with environment temperature confidential relation are arranged.And as the senser element of ultraviolet index monitor, it is outdoor that the Schottky Ultraviolet sensor is placed in, environment temperature can be between-40 ℃～+ 50 ℃ large-scope change, bigger to the measurement result influence.Therefore, in ultraviolet index monitor, add temperature compensation module, real-time monitoring environment variation of temperature, and measurement result carried out suitable correction, to guaranteeing the accuracy of measurement result, be very necessary.Through the AD590 chip that laser trimming was calibrated, its detection sensitivity is 1 μ A/K, and output current value (μ A) can directly characterize thermodynamic temperature (K).

The circuit theory of each module of ultraviolet index monitor host machine part as shown in Figure 5, signal from the ultraviolet index monitor head passes through the multicore shielding line after amplifying circuit amplifies, enter the analog input channel of modulus conversion chip MAX154, passage AIN2 is a UV signal, and passage AIN4 is a temperature signal.For avoiding interference, with all the other two analog input channel ground connection of modulus conversion chip MAX154.Analog channel address selection input pin A0 ground connection, A1 connects the P1.5 mouth of single-chip microcomputer, can select UV signal or temperature signal to carry out analog to digital conversion by P1.5 set or clear " 0 " to single-chip microcomputer, the data-out bus of MAX154 connects the P2 mouth of DS87C520, data after conversion finishes can be read by the P2 mouth, the P1.7 that the EOC signal output INT pin of MAX154 connects single-chip microcomputer can judge by the level state of inquiry P1.7 pin whether conversion finishes.

Handle through high-speed microprocessor DS87C520 through data after A, obtain corresponding ultraviolet index and temperature, and after according to environment temperature ultraviolet index being revised accordingly, obtain correct ultraviolet index value, send the column color lamp to show ultraviolet index by serial communication port 0, after the MAX232 level conversion, send into 128 * 48 matrix LED big screen display screens by serial communication port 1 and carry out the demonstration of ultraviolet index, temperature.Simultaneously, in last column of dot matrix screen, roll display is the necessary protection measure that the skin public institute that avoids tanning severely should take under this ultraviolet index grade, and this literal shows and can finish after the download in advance by downloading.

As shown in Figure 6, the program circuit of a kind of ultraviolet index monitor that the embodiment of the invention provided:

1) initialization;

2) carry out the A/D conversion, obtain temperature and ultraviolet total intensity;

3) calculate current temperature value;

4) table look-up and obtain temperature compensation coefficient;

5) calculate ultraviolet index;

6) displays temperature, ultraviolet index and relevant information.

In the subroutine, comprise configuring ports and AD conversion chip control port when serial ports 0 control column color lamp shows ultraviolet index the configuration subroutine, send subroutine, the serial ports 0 control column color lamp of data communication subroutine, AD conversion portion to show that subroutine, the column color lamp display subroutine of ultraviolet index, the literal of ultraviolet index download etc. by serial ports 0 to the column color lamp.

The ultraviolet index brief introduction

1) definition of ultraviolet index

Ultraviolet index is the degree that the solar ultraviolet radiation of tolerance arrival earth surface influences human skin.Ultraviolet ray is made according to " the erythema effect curve of spectrum " the infringement of human skin.The erythema effect curve of spectrum as shown in Figure 7.The erythema effect curve of spectrum is to cause a large amount of statistical study and the result of study of the MID of human skin erythematous response to be made according to the UV radiation to different wave length.This curve has been comprised the World Health Organization (WHO), and (World Health Organization, WHO) etc. many international organizations adopt, as an important evidence calculating ultraviolet index.

Stipulate according to the World Health Organization (WHO), vary in size by ultraviolet index, the sun can be tanned by the sun type and be divided into basic, normal, high, very high, high five classes, each sun is tanned by the sun the identification directly perceived of classification for the ease of the public, represent five kinds of different exposure in sunshine classifications with green, yellow, orange, red, purple respectively, ultraviolet index is represented ultraviolet intensity, and the high more expression uitraviolet intensity of index is strong more, and the chance that skin is damaged is high more.On the abundant date of sunlight in summer, ultraviolet index can rise usually and surpass 10.In the time of cloudy and rainy, ultraviolet index just can lower.Tan by the sun classification for the different sun, we should take corresponding sun-proof measure, to prevent or to alleviate possible uv damage.

2) calculating of ultraviolet index

The standard method of the calculating ultraviolet index that the World Meteorological Organization (WMO) and the World Health Organization (WHO) advise is:

I. measure the solar ultraviolet radiation intensity E (λ) of 280nm～400nm different wave length, shown in curve among Fig. 71;

II. the solar ultraviolet irradiance with different wave length multiply by erythema effect curve of spectrum S (λ) (shown in the curve in Fig. 7 2)

Interior corresponding weighting numerical value is to reflect that human skin is to ultraviolet reaction;

III. the solar ultraviolet radiation intensity E (λ) of different wave length and erythema effect curve of spectrum S (λ) are multiplied each other, then wavelength 280nm～400nm is carried out integration, draw the total ultraviolet radiation intensity that is subjected to after the weighting of the erythema effect curve of spectrum

$E_S={\∫}_{280}^{400}E\left(\mathrm{\λ}\right)S\left(\mathrm{\λ}\right)\mathrm{d\λ}---\left(1\right)$

Unit is mW/m ²The following area of curve among Fig. 8 just;

Total ultraviolet radiation intensity after the erythema spectrally-weighted be multiply by 0.04, obtain ultraviolet index.Promptly

$\mathrm{UVI}=0.04{\∫}_{280}^{400}E\left(\mathrm{\λ}\right)S\left(\mathrm{\λ}\right)\mathrm{d\λ}---\left(2\right)$

Formula (2) is exactly the computing formula of ultraviolet index.

The GaN ultraviolet Schottky detector that is complementary with the erythema curve

Record gallium nitride material Schottky ultraviolet detection device spectral response curve by experiment as shown in Figure 9.The whole as seen from Figure 9 spectral response curve and the erythema effect curve of spectrum are very identical.Very little to the ultraviolet response during greater than 350nm at wavelength, but the erythema curve weighting of this moment is also very little; In the response of 250～320nm wave band better, especially have comparatively level and smooth responsiveness between 280～320nm, the visible light rejection ratio is about 10 ³, device ends fully in visible-range, and such curve shape is very near the erythema effect curve of spectrum, measurement to ultraviolet index provides very favorable condition, feasible measurement no longer needs optical filter, can directly measure, and can reduce error.

Claims (4)

1, a kind of ultraviolet index monitor is characterized in that, comprising:

One hardware circuit part is made up of head and main frame two parts, wherein,

One head part is used for the reception and the amplification of UV signal and temperature signal; Comprising:

One Schottky ultraviolet detector connects the input end of pre-amplification circuit;

One temperature sensor connects the input end of signal amplification circuit;

One host machine part, comprising:

One analog to digital conversion circuit is used for the analog to digital conversion of signal, connects the pre-amplification circuit of head and the output terminal of signal amplification circuit respectively;

One single chip machine controlling circuit is used to finish data processing and temperature compensation, connects the output terminal of analog to digital conversion circuit;

One display circuit is used for the demonstration of measurement result, and shows the ultraviolet index of measuring with the form of the colored column of the relevant color assignment that meets the World Health Organization (WHO), connects the demonstration output terminal of single chip machine controlling circuit;

The software program of single-chip microcomputer compares data after handling and prior ultraviolet index data of having calibrated, and after searching temperature compensation data, can obtain final real-time ultraviolet index value and temperature value, deliver to LED dot matrix screen then and the column color lamp carries out the demonstration of ultraviolet index and temperature.

2, ultraviolet index monitor according to claim 1, it is characterized in that, the head of described ultraviolet index monitor is a can, box top ultraviolet ray inlet is provided with hemispheric quartz glass cover and teflon diffuse transmission plate, be provided with the Schottky ultraviolet detector in the box, the inwall blacking of box shell.

3, ultraviolet index monitor according to claim 1 is characterized in that, the second amplifying circuit that described pre-amplification circuit is made up of precision operational-amplifier.

4, ultraviolet index monitor according to claim 1 is characterized in that, the flow process of described scm software program:

1) initialization;

2) carry out the A/D conversion, obtain temperature and ultraviolet total intensity;

3) calculate current temperature value;

4) table look-up and obtain temperature compensation coefficient;

5) calculate ultraviolet index;

6) show the information that comprises temperature, ultraviolet index.

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