Utilizing Handheld Spectroradiometers for Accurate Spectral Measurement

The handheld spectroradiometer is a spectrometer based on XRF (X Ray Fluorescence) spectroscopy technology, which consists of X-ray tube, detector, CPU and storage. Due to its portability, efficiency, portability and accuracy, it has important application in alloy, ore, environment, consumer goods and other fields.

I.Introduction:
Handheld spectroradiometer require high resolution and signal-to-noise ratio, better intensity accuracy and wavelength accuracy, strong anti-interference from external environment and excellent instrument stability. In the software of instrument, it requires derivative and deconvolution of complex mathematical calculation. It can calculate the similarity between spectra, pattern recognition analysis, supporting multivariate calibration analysis and user-built spectrum library and retrieval.

LISUN LMS-6000 Portable CCD Spectroradiometers were in the market for more than 10 years, LISUN engineers service team already summary the most of the After Sales Questions and Answers in the above link. Please read it carefuly, you can solve the most of the problems by yourself if you have some questions while using the instruments. LISUN will be continue to update this pages and more FAQ can be found in this topic link. 

II.Theory:
The handheld spectroradiometer is a spectrometer based on XRF spectroscopy technology. When the energy of X-ray is higher than the binding energy of inner layer electron of atom, a vacancy will be ejected and the atomic system will be in an unstable state. When the outer layer electron jumps into the vacancy, one photo-electron will be ejected and the photon ejected may be absorbed again and another secondary photo-electron ejected from the outer layer will occur, which is called Auger effect, or secondary photo-electron effect or non-radiative effect. The photo-electron ejected is called Auger electron. When the energy released by the outer layer electron into the inner layer vacancy is not absorbed by the atom, but released in the form of photon, X-ray fluorescence will be produced, and the energy or wavelength is characteristic, which is one-to-one corresponding to the element. According to Moseley’s law, as long as the wavelength of fluorescence X-ray is measured, the kind of the element can be known, which is the basis of qualitative analysis of fluorescence X-ray. In addition, the intensity of fluorescence X-ray has a certain relationship with the content of corresponding element, so element quantitative analysis can be carried out. The X-ray detector converts the light signal of the characteristic spectrum line of the sample element X-ray into an easily measurable electric signal to obtain the characteristic information of the measured element.

III.Feature:
1. On-site detection, quick and non-destructive, no need to send to the laboratory, greatly improving efficiency
2. Analysis speed is much faster than that of desktop spectroradiometers, only a few seconds to display the analysis results
3. Small in size and light in weight, easy to carry

IV.Application:
The application of handheld spectroradiometer is very wide, involving: power, petrochemical, archaeology, metal processing, pressure vessel, recycling of waste materials, aerospace, geological exploration, mine surveying, mining, ore sorting, mineral trading, metal smelting, environmental monitoring, soil monitoring, toys, clothing, shoes, electronics products and many other fields.

Handheld spectroradiometers can be divided into alloy analyzers, ore analyzers, soil/environmental analyzers, RoHS analyzers, etc. Generally, the element range of analysis instruments is Mg~U.

V.Operation:

1. When operating the handheld spectroradiometer, avoid long-time exposure to sunlight as this may damage the liquid crystal display, and the best environmental humidity is between 0-95%. Do not place it in an environment with liquids or corrosive solvents, which will also cause significant damage.

2. When changing the detection window, be sure to work in a dust-free environment to prevent dust from entering. Close the detector window when replacing it, and do it quickly.

3. If there is sticky material on the handheld spectroradiometer that needs to be cleaned, a small amount of alcohol should be taken with clean cloth along the edges of small holes to wipe it gently. Remember, never insert any object into the detector, as it may damage it and cause substantial losses.

4. If there are dirt or dust on the surface of the handheld spectrum meter, first blow it away with compressed air, then carefully clean it with a small piece of wet cloth. Do not use rough cloth to avoid damage.

5. The touch screen of the handheld spectroradiometer is composed of sensitive electronic components and should be regularly cleaned with soft and non-shedding superfine fiber cloth. Do not use cleaners or liquid cleaning products, as this may scratch the screen.

VI:Maintenance：
Daily maintenance and maintenance of instruments is very important, because daily maintenance and maintenance are related to the life of the instrument. If the maintenance is proper, not only can the life of the instrument be increased, the quality of the work can be guaranteed, but also the work efficiency of the workers can be improved in the work.

So handheld spectroradiometer should start from the operation and use, avoid frequent on and off and pulling of the trigger in a short time; do not insert sharp objects into the detector; gently click on the screen to avoid damaging the liquid crystal display; fix the instrument to prevent dropping and crashing, and avoid damaging the molybdenu window and precision components; prohibit deleting any programs, folders, documents, etc. from the device.

So what should we pay attention to in the maintenance and maintenance of handheld spectroradiometer?
1. When cleaning the surface of the instrument for dirt or dust, blow off the surface dust before wiping (soft gauze cloth);|
2. It is strictly prohibited to delete any programs, folders, documents and USB drivers (U disk) with viruses.
3. Hand-held spectroradiometers should not be pointed to any person or any part of the body in the beam when measuring;
4. The instrument needs to be replaced with the window film in a clean and dust-free environment to prevent dust from entering the window of the detector;
5. X-ray tube and detector of handheld spectroradiometers are precision components, so it is forbidden to knock and smash the instrument;
6. Handheld spectroradiometer should not squeeze the computer screen;
7. Special person to be responsible for. The equipment should be stored in a dry environment and not be stored in the sun for a long time to avoid damage to the LCD screen. Do not place it in fog, liquid and corrosive solvents;
8. It is forbidden to insert any objects into the detector at any time. This will cause damage to the detector and invalidate the warranty;
9. The charging voltage of battery for handheld spectroradiometer is 220V AC, strictly prohibited the use of 380V AC, it is forbidden to use other chargers to charge the battery, and it is forbidden to disassemble the battery;
10. Handheld spectroradiometer battery can be stored for a long time, it needs to be charged once a year.

Tags：LMS-6000