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Principles and Applications of UV Light Meter
Date:2014/1/17 9:57:19
UV Light Meter ( also known as UV intensity meter ) is a specialized measuring ultraviolet light , brightness of UV test instrumentation . Is to measure the UV light intensity ( illuminance) of the object is the degree of radiation , i.e. the ratio of the obtained surface area to be illuminated with the light flux . UV light meter is usually caused by selenium photocell or silicon photovoltaic cells and microamps tables.
UV light directly to the battery is converted into electrical energy photovoltaic element . When light strikes the surface of selenium photocells , the incident light through the metal reaches the boundary surface of a semiconductor thin film 4 selenium layer 2 and the metal film 4 , resulting in the photoelectric effect in the interface. Photocurrent generated by photovoltaic cells by size and light illumination on the surface of a proportional relationship . Then if connected to an external circuit , there will be a current through the current value from milliwatts (mw) of microampere meter indicates the scale out . The photocurrent depends on the intensity of incident light. UV Light Meter change gear device , so you can measure high intensity , illumination can also be measured .

Scaling principle:
So Ls vertical illumination light battery → E = I/r2, r can change the photocurrent values obtained under different illumination by the correspondence between E and i will convert the current scale illumination scale.

Calibration method :
Standard lamp using the light intensity at the point source approximation working distance , and the standard lamp changes photocell distance l, the distance of each record of the current meter reading , the inverse-square law E = I/r2 calculated illuminance E, the this can get a range of different light illumination current value i, for i and photocurrent curve illumination E , namely light meter calibration curve thus can control meter dial indexing is illuminometer scaling .

Calibration curves factors :
Photovoltaic cells and the need to replace the current meter re- calibration ; illuminometer after a period of use should be controlled meter re- calibration ( generally should test 1-2 times a year ) ; precision light meter standard light intensity available for examination ; expand illuminometer calibration range can change the distance r, can also choose a different standard lamp , use a small -scale current account

The main role
UV illumination and the people's work is closely related to production and life . Plenty of light , to prevent people from accidents . Conversely, too dark light can cause fatigue far beyond the extent of human eye itself. Therefore , discomfort or poor lighting conditions is one of the main causes of accidents and fatigue . Available statistics show that about 30 % of all occupational accident labor is directly or indirectly caused due to insufficient light . Of the stadium ( museum ) lighting requirements are very strict , the light is too strong or too dark effect will affect the game.
So, the degree of hygiene requirements for room control how people live in it ? Illumination in the health science a very important indicator. Refers to the human eye alone can cause a feeling of luster electromagnetic radiation , when light enters the eye consciousness can produce is called vision. It refers to the visible light is seen , in the wavelength range between 380 ~ 760nm ( nanometers ) .

Lighting can be divided into natural light and artificial light into two categories. Natural light is the natural illumination indoor and regions have direct daylight scattered light reflected light around objects , and natural daylight factor commonly expressed illumination . The daylight factor is the ratio of the effective area lighting indoor floor area of the mouth . General residential lighting coefficient between 1 /5 to 1/15, living area ratio between the ( window area / indoor floor area ) 1 / 8 to 1 /10. Natural illumination factor is used to evaluate the level of natural light illumination . It is a reflection of the room and simultaneously irradiated with light from the outside to the relationship . Also reflects ( the sum of the natural light of the sun illumination energy and climate targets ) the local light climate .

To protect the people in the appropriate visible light life , our developed on indoor ( including public spaces ) Health illumination standards. In public places such as shopping malls ( shop ) illumination hygiene standards ≥ 100Lx; libraries, museums , art galleries, exhibition countertops sanitary standards illumination ≥ 100Lx; public bathroom illumination health standards ≥ 50Lx; bathroom ( shower , pool bath ) ≥ 30Lx, saunas ≥ 30Lx abroad on indoor illumination standards , such as Germany recommended several nominal intensity , office clerical work area is 300Lx, typing, drawing work for 750Lx;. illumination in the factory , the production line of sight job requirement 1000Lx; hotels, public rooms for 200Lx; reception point , cashier counters to 200Lx; shop window for the 1500 ~ 2000Lx; hospital wards to 150 ~ 200Lx, emergency treatment area is 500Lx; schools , classrooms for the 400 ~ 700Lx; cafeteria , indoor gym to 300Lx so on.

The method for measuring the size of the illumination , usually with light meter measurements. Luminometer to measure the intensity of different wavelengths (e.g., measurement of the ultraviolet band and visible light ) , it may be to provide accurate measurements.

Applications
1 General applications in public places
In order to ensure that people can live in the appropriate light , developed country on indoor ( including public spaces ) Health illumination standards , the use of the various places illuminometer illuminance measurements. General public places Mall ( store ) , libraries, museums , art galleries, exhibition halls countertops illumination hygiene standards ≥ 100Lx, use light meter DT-1300 be most appropriate to the illumination control . DT-1300 Light Meter Compact portable design , you can carry , easy to use you in a different place , 31/ 2 digit LCD display for easy fast and accurate readings .

2 . Lighting manufacturing industry , photographic industry , stage lighting layout , etc.
Illuminometer has been successfully applied to a number of scenarios, such as lighting manufacturing industry , photographic industry , stage lighting layout , etc. illuminometer different models to meet different measurement requirements illuminometer 8809 series also with USB interface , data can be entered into the computer data analysis, real-time monitoring

3 . Factory production line applications
At the factory, the production line of illumination requirements more stringent, continuous work will cause visual fatigue , working efficiency greatly reduced, usually illumination requirements ≥ 1000Lx, high demand for illumination places large range of optional light meter , light meter DT- 8808 , large range , can cope with the strong light intensity measurement. DT-8808 is a handheld light meter to measure the luminosity of the exact number of professional light meter , in line with CIE spectral response requirements. Automatic range setting , rapid response , measuring speed of 1.5 times / sec , large -scale 400000LUX, fast and accurate measurement of illuminance readings, this light meter high cost , is your measurement.

4 illuminometer is widely used , but also our daily life applications, such as factories, warehouses , schools, offices, homes , street construction, laboratory and so on.

Main features:
Aluminum alloy shell, compact and flexible, you can one-hand operation ,
128 * 64 backlit LCD screen , beautiful and easy to read interface,
Separate the probe and the body design, easy to switch to a different spectrum of the probe ,
Automatic memory function, can be recycled to store 10 sets of data,
With lock function to facilitate the comparison of recorded work ,
Auto power off function to save power ,
Microcomputer technology, high accuracy, low power consumption
Linear UV detector , good stability , small visible affected by
Use of green rechargeable lithium-ion battery ,
Comes with a standard USB charging port can interface directly with a computer to charge USB,
According to the U.S. NIST calibration standard production volume biography .

Technical parameters:
Spectral range : UV 250-410 nm, center wavelength: 365 nm,
Resolution : 0.01 mW/cm2 (1mW/cm2 = 1000 uW/cm2)
Range : 0-1999 mW/cm2 ( milliwatts / cm )
Measurement error : ± 5%
The use of power : 1000 mAh lithium-ion battery
Battery power consumption: about 0.1mA
Battery life: about 500 full charge and discharge times , filled with a normal 60 days , depending on usage .
Main housing material: aluminum, anodized surface treatment
Dimensions: square structure , long- 120x width 78x height 18 mm ( millimeters )
Display: 1.5 inches ( 128 * 64 LCD screen + glass )
Sensitive probe: diameter : 35mm, height : 16.5mm
Probe line : the standard line : 1.5 m extension cord : 2 m
By Aperture : Φ9mm
Sampling time: about 0.5 seconds
Data Logging: 10 groups circulation data
Charging Interface : USB ( standard charging port )
Host weight : 240g
Probe Weight : 80g
Operating temperature : 0 to 85 ℃ ( degrees Celsius )
Withstand temperature : under 120 ℃ ( degrees C ) continuous irradiation conditions less than 20 seconds


UV light meter to note the ambient temperature :
Care must be taken to avoid receiving a strong light when used as photoelectric cathode prolonged exposure to bright light , there will be fatigue , the photoelectric cathode emission is not normal. So do not protect the illumination timing window cover to cover , in addition to ambient UV light meter is not working very high, nor low.
Especially as a receiver using the thermoelectric effect element UV light meter , ambient temperature requirements more stringent ( usually at 20 ℃); while GD-5 with a photocell receiver do to the environment is not very strict temperature requirements , and generally the lower the temperature , the better ; . Moreover, in order to reduce the dark current measurement radiation source to be perpendicular to the receiver 's window , will produce large errors if the tilt. At this point the need for angle correction .

The calibration method
Although different from the calibration test, but the person should also be calibrated by the effective assessment and obtain the appropriate certificate , only certified personnel to stay square and calibration calibration certificates issued reports , and only such a certificate and report only considered valid . Calibration can be measured by looking for a place or a third-party calibration units , as measured by Shanghai , Guangzhou Institute of Measurement and testing, measurement and calibration Suzhou nets , provided all have to have qualifications issued by the State CNAS measured .
 
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