Digital Microscope Cameras

The successful line of digital microscope cameras by Vee Gee Scientific has added a new version of its H-Series to its VanGuard microscope accessory line., as carried by National Microscope Exchange. The newly designed VanGuard H-Series digital microscope camera system has replaced the popular older style H-series camera system, which was a mainstay of the company for years. VanGuard is a growing and respected importer of quality microscopes and accessories according to National Microscope Exchange President Rowland Brasch.

“The newly designed H-Series digital microscope camera system continues on in the tradition of excellent VanGuard products which have made it a leader in quality and affordable microscopes,” said Brasch. “The new H-series system incorporates the accuracy and ease of use found in the older style H-series which gives you the digital microscope camera, software, adapters and cables required to connect it to your computer.”

The H-Series digital cameras from VanGuard produce high-definition live images and video for the documentation and archival of clinical, life science, and material science laboratory analysis. With resolution of 1600 x 1200 (UXGA) and the included image capture software suite, the H-Series cameras are a perfect match for nearly any scientific application. Equipped with ½" CMOS image sensors, VanGuard H-Series digital cameras deliver exacting image clarity and color. In addition, H-Series digital cameras come standard with the following features: still & video capture modes, automatic/manual exposure control, manual gamma control, and automatic/manual white balance control.

“Vanguard products such at the H-Series digital microscope camera system are popular with users because of their accuracy and ease of use,” said Brasch. “The H-Series system is more affordable than some of the other products in the digital microscope camera product line, making it more attractive to cost-conscious users.

You can learn more about National Microscope Exchange products by visiting www.nationalmicroscope.com or by calling 800-851-7635.

Digital Microscope Cameras

How Polarized Light Works in a Microscope

By Rowland Brasch

Normal light waves go in every direction. In a polarizing microscope the light waves are managed using two polarizing filters. One is called the analyzer and the other is the polarizer.

One way to understand how to create polarized light is to pass ordinary light, containing light waves that are vibrating in all directions, through thin slots cut in a piece of paper.

If the slots were aligned vertically then only the vertical light waves would pass through while the others would not. The vertical lights coming out of the slots are considered polarized light waves. These light waves in turn then illuminate the sample, usually crystals of some type. After passing through the crystal they are now out-of-sync because they moved at different velocities within the mineral. Once the light waves pass through the analyzer the colorations of the crystal provide identification of such samples.

Good examples of polarizing microscopes would be the Meiji ML9420 or the VanGuard 1242MM.

Most minerals are viewed where these polarizing filters are turned at 90 degree angles to each other. Polarizing microscopes are used to observe minerals and crystal formations. Applications can be in the clinical field for gout, law enforcement for drug analysis, industrial testing and geological applications.

How Polarized Light Works in a Microscope

Microscope Maintenance | Microscope Repair

Customers often ask what they can do when they have problems with lubrication and focusing problems with their microscopes. Here are a few questions along with our suggestions:

Question: What product should I use to lubricate the bearings on the stage of the microscope?
Answer: Each manufacture has their own line of lubricants they recommend. If you bought everyone for each product it would be extremely expensive. We use a product called Super Lube made by Permatex. It should be available from many stores in your area. We use this product on all brands of microscopes that we service.

Question: My stage seems to slip down out of focus for no reason. What can I do to prevent this?
Answer: There are two main reasons for this problem. Either the tension control is too loose, or the main bearing system in the stage mechanics needs some adjustments.

You, as the microscope user, can adjust the tension control. Many microscopes have focus tension controls attached next to the coarse focus control. This control may be the simple type that you can adjust by just using your hand, or it may take a special tool. On Olympus or Nikon microscopes the adjustment is usually on the right side of the scope as the stage faces the user. It is a thin control knob or disc that is placed between the microscope stand and the coarse focus control. All you have to do is turn this device one way or the other and it will increase or decrease the tension on the coarse focus control knob. This in turn will keep the stage from slipping down. Make sure you are not turning the stage lock control, which is normally on the opposite side of the tension controller. If your microscope takes a special tool to adjust the tension. and you have lost this tool, you will need to contact the microscope manufacture or the company you purchased your microscope from and request the adjustment tool.

If the main bearing system needs adjustment you will should contact a qualified microscope repair technician to do this repair.

Author Name: Rowland Brasch: Nationalmicroscope.com

Microscope Maintenance | Microscope Repair

ATAGO Refractometers

ATAGO Company LTD. is an ISO 9001 certified manufacturer, and has been the leading innovator in refractometer technology for over 70 years. The company has developed a full line of refractometers and polarimeters for measuring liquid concentrations in the lab, as well as a variety of hand held refractometers to use out in the field or on the production line. ATAGO refractometers and polarimeters can be found in over 155 countries, and are not only used in food and beverage industries, but also in research laboratories, universities, clinics and industrial settings.
The history of Refractometers began with a basic model – a simple analog instrument. Today, refractometers are highly sophisticated instruments due to the advancement of technology and the incorporation of high precision electronics into a refractometer.
ATAGO is constantly researching various and unique needs in the market, developing new and innovative products to meet the demands. In it’s quest for solutions to satisfy it’s customers needs, ATAGO continually strives to produce and bring to the market new instrumentation, which has never been seen or considered before through their in-depth research and development.

The USA office, located in Bellevue, Washington in the heart of the thriving Great Northwest, ATAGO U.S.A. is now in a better position to provide technical and sales support to all our valued distributors and end-users in North, Central and South America. ATAGO U.S.A. is committed to responding quickly and efficiently to every customer inquiry, and comprehensively researching their dynamic market place.


Author Name: Rowland Brasch: Nationalmicroscope.com

ATAGO Refractometers

In-Line Refractometers

In-Line refractometers are designed to monitor and control the concentration of dissolved solids or water soluble liquids in your process lines. These instruments can be incorporated in piping of manufacturing plants, liquid mixing devices, and washing apparatuses to continuously measure the concentration of various liquids. In-Line refractometers are suitable for use in the control of mixing, concentration, fermentation, and control of the concentration of water-based or alkali-based detergent, etc.

The light from an LED source is transmitted by a fiber optic onto one side of a measuring prism and internally reflected to the interface of the prism and the sample liquid. A portion of this light beam is reflected back onto the opposite side of the prism at an angle which depends on the refractive index of the liquid at the interface. The position of this reflected beam, as it exits the prism, changes with the angle of reflection (which depends on the refractive index of the sample). A linear diode array is used to accurately detect the varying position of the reflected beam, and this position is calibrated with respect to refractive index. As there are no moving parts with in-line refractometers, only precise optical and electronic elements, the calibration is very stable, repeatable and accurate.

To connect the in-line refractometer to your system you simply attach the unit to a piping system to monitor food or beverage production, pharmaceutical production, industrial fluid, washing devices, dilution/mixing devices, etc. The in-line refractometer will continuously monitor water content and mixing ratio with successive measurements of refractive index, Brix, or concentration.

The ATAGO Model PRM-100α In-Line Refractometer is just such an instrument. It can provide the following:

• Wide range 0.0 to 100.00% Brix range
• Improved measurement accuracy: Brix ±0.05%, nD ±0.00010
• Two options for setting the minimum indication decimal place
• Simple two-piece construction: detection section and operation display section
• Easy-to-read color display panel.

Author Name: Rowland Brasch: Nationalmicroscope.com

In-Line Refractometers

Antifreeze Refractometers

Low temperatures leading to freezing conditions can, if not managed correctly, often result in serious damage to plant and equipment, chillers and engine cooling systems. System blockages, cracked pipes and unwanted fluid loss can be expensive both in terms of operational down-time and ultimate repair or replacement costs. It is therefore essential that systems are properly protected and antifreeze levels are periodically tested. Testing of antifreeze concentrations for automotive and industrial applications has been made easier by the use of antifreeze refractometers.

The antifreeze/battery refractometer is designed for testing the refractive index or concentration of battery fluids, antifreeze liquid and cleaning fluids that works on the critical angle principle. Antifreeze refractometers utilize lenses and prisms to project a shadow line onto a small glass reticule inside the instrument, which is then viewed by the user through a magnifying eyepiece.

In use, a sample is sandwiched between a measuring prism and a daylight plate. The reading is taken when a shadow line crosses the scale from the shadow line formed between the illuminated area and the dark area then a shadow line crosses the scale. With the indication of the percentage you may know which temperature the fluid will be frozen for both propylene glycol and ethylene glycol. It can also be used for checking the strength of electrolyte solution batteries.

Refractometers represent the most accurate conventional testing method available for determining freeze point and concentration of engine coolants and antifreeze solutions. Don't be misled by hydrometers or freeze-point test strips, which are not accurate enough to be useful.

One of the best instruments to test these solutions is the ATAGO Antifreeze Refractometer model Master BCF. This refractometer has an exclusive scale for measuring specific gravity of battery fluid and for checking the freezing temperature of ethylene glycol and propylene glycol which are used as antifreeze mixture in automobiles, thermal catalyst for solar power systems and other industrial applications. The Master BCF is easy to use and accurate for testing in the field

Author Name: Rowland Brasch : Nationalmicroscope.com

Antifreeze Refractometers

Inverted Microscopes

Most microscopes that you see in a typical laboratory environment are compound microscopes. They are designed with objectives on a rotating nosepiece mounted above the stage, and the light source and condenser below the stage. They are most commonly used for viewing samples that have been fixed to a flat slide.

In certain applications it is necessary to look at live, unfixed samples. A more practical microscope design to use is the inverted microscope. An inverted microscope is a microscope with its light source and condenser on the top, above the stage pointing down, while the objectives and turret are below the stage pointing up. Inverted microscopes are useful for observing living cells, tissues or organisms at the bottom of a large container (such as a tissue culture flask). This allows you to examine the specimen under more natural conditions than on a glass slide, as is the case with a conventional compound microscope. You can place a Petri dish or other container on the stage and view the samples from below, thus not disturbing their more “natural” states. Larger, covered samples are less susceptible to evaporation and increases in temperature, thus preserving suitable living conditions for the specimen you are viewing.

Because of the fact that you have to look through thicker containers you often find the objectives to be long working distance or ultra-long working distance. These objectives have been corrected for observing samples that are further away than what you normally see on a compound microscope. The image may not be quite as clear as when you are looking at a perfectly flat slide. You may want to use a plastic Petri dish rather than a glass one as the plastic dishes are thinner and more uniform. Most inverted microscopes will have objectives that range from 4-40X, with 60X being an added option. You do not usually find inverted microscopes that incorporate 100X objectives.
Inverted microscopes can be configured for work in electrophysiology, in vitro fertilization, micromanipulation, high-resolution DIC, video-enhanced observations, and a variety of advanced fluorescence techniques. Motorized accessories can include shutters, filter wheels, revolving nosepieces, fluorescence block turrets, focus drives, and condensers. Inverted microscopes also allow you to add advanced objectives for water immersion, ultraviolet excitation, and phase contrast. Prices for inverted scopes vary according to the number and types of accessories you add to them, just as in compound microscopes.

The fundamental advantage of an inverted microscope is that it allows you to accept a container with a large and relatively long-lived diverse culture of live organisms without any preparation. This can be invaluable to work which requires the sample to be alive and in as natural an environment as possible.

Author Name: Rowland Brasch : Nationalmicroscope.com

Inverted Microscopes