Common Problems with Laser Spectroscopy Systems

The book provides practical troubleshooting methods for typical problems with laser spectrometers, such as an abnormal laser spot or a drop in power.By analyzing the fault phenomena, checking key components, and providing operational suggestions, users can quickly locate the source of the problem and ensure the stable operation of the equipment.

What should you do if you encounter an abnormality in your spots of light?

An irregular or off-center laser spot is a common problem in laser spectrometry.If this happens, don't panic and try to take the machine apart; first check these places:

If the spectrum is not centered, adjust the prism until it is.

Using a clean lens tissue, gently wipe the lens surface to see if there are any scratches or stains.If the screws holding the mirrors in place become loose, use a hex wrench to slowly adjust them.

The light path is not properly aligned.

Move along the path of the light beam with a piece of white paper and see if the light is diverging.If the light spot deviates from the path, it may be necessary to re-calibrate the angle of the laser and the mirror.When calibrating, two people should work together. One adjusts the mirror, while the other watches for changes in the light spot.

Environmental vibration interference.

Is the lab next door being renovated? Is the ventilation system running too fast? These vibrations will make the laser beam "tremble.Trying to turn off nearby vibration sources, or placing anti-vibration pads under the optical platform, often produces immediate results.

How to cope with sudden power drops.

Don't panic if the laser output gets weak. Check the following in order to get the most efficient results: 1.

Check the power source, and ventilation.

First, feel the outside of the laser. If it is too hot, turn it off to allow it to cool.Check the power indicator light, as sometimes the power supply is unstable due to poor contact with the plug. In this case, try plugging the computer in to a different socket.

The optical elements are aging.

Prisms get "tired" with age.The power of the lens can be checked with a power meter. If the difference in power between the front and back of the lens exceeds 15 %, then it is time to consider replacing it.

Warning of the end of a laser tube's life.

Like a car odometer, when the laser tube's working time exceeds 80 % of its rated life, even if it still works, it will no longer be able to put out the power it used to.Keeping a record of use, and having replacement parts ready, is even more reliable.

These are the three golden rules of daily maintenance.

This is a weekly cleaning ritual.

Wipe the lenses with a cotton ball soaked in alcohol, in a circular motion. Never use a paper tissue to wipe them.When cleaning, wear a mask to prevent water vapor from condensing on the lens.

Control of temperature and humidity.

The rainy season is no time to be complacent. When the humidity exceeds 60 %, it's easy to get fog.I suggest you get a dehumidifier, and keep the temperature between 20 and 25 degrees. This is as important to optical equipment as air conditioning is to people.

Maintain a log of problems.

Every time after you do a repair, write down the symptoms, the method of handling, and the result. After three months you will discover that these problems actually have a pattern. The next time you come across a similar situation, you can save half the time by checking the log.