Barcode scanners serve as the main transfer point between barcode labels and the computers that decode them. As such, they are a crucial component of all sophisticated laboratory tracking systems; however, with so many on the market, selecting one that fits your workflow can prove challenging. Below, we have listed the different types of scanners, with a few tips on how to determine which one might best meet your lab’s scanning requirements.
Types of barcode scanners
Pen-type scanners – A light source and a photodiode are placed adjacently in a pen or a wand so that the photodiode can register the intensity of the light reflected at it. Waveforms are generated that measure the widths of the bars and spaces, the patterns of which are decoded by the scanner.
Laser scanners – These are similar to pen-type scanners but use a laser beam instead of a simple light source, as well as a reciprocating mirror or a rotating prism to guide the laser across the barcode. These scanners are well-suited to read 1D barcodes at a distance of 6 to 24 inches away.
Charge-coupled device (CCD) scanners – Also known as LED scanners, they use hundreds of small light sensors lined up horizontally across the head of the reader to gauge the intensity of the light reflected at it. These sensors generate a voltage pattern identical to that of the barcode. Unlike pen-type or laser scanners, CCD scanners measure the ambient light from the barcode without producing a beam of light.
Camera-based scanners – 2D imaging scanners use a small video camera to record an image of the barcode and decode the information with digital imaging software. The principle is the same as that of CCD scanners, with light sensors replaced by the camera, which comprises hundreds of rows of light sensors. Barcode scanning software on smartphones works this way, using the built-in camera to take a photo of the barcode. These scanners are excellent at reading 2D barcodes, even off digital surfaces like cell phones and computer screens.
Omni-directional scanners – Omni-directional scanners direct multidirectional laser scanning lines in various orientations, producing an arrangement that can cross all the barcode’s bars and spaces at different angles. Most use a single rotating polygonal mirror along with several fixed mirrors to generate complex patterns these scanners require to read barcodes. These scanners, usually found in supermarkets, are ideal for reading damaged, ruffled, or poorly printed barcodes found on grocery items.
Types of barcode scanner formats
Handheld – Handheld scanners have the advantage of being easy to use and flexible in their positioning. If purchasing a handheld scanner, it’s worth verifying whether it is compatible with a stand. These scanners can be corded or cordless, depending on the need.
Mobile units – Similar to handheld devices, these are flexible scanners that can be manually used to scan samples. However, mobile units are more adapted to scanning over large distances, allowing access to remote locations where plug-in systems would be impractical, such as areas without power outlets.
Presentation – These scanners are locked in place, often on a countertop, for stationary use. Samples can be scanned one-by-one through the scanner.
In-counter – These scanners, often found in grocery stores embedded into the checkout counter, allow quick scanning of items.
Fixed mount – These scanners are typically integrated into logistics processed, namely assembly lines and other large-scale workflows, so read barcodes automatically as each item passes through. Automatic barcode readers, such as the ones developed by Scinomix, utilize a similar type of scanner to read each barcode as tubes are decapped, capped, and filled.
Corded/cordless – With the advent of Bluetooth technology, cordless scanners have become much more prevalent in research, healthcare, and other sectors. Using a cordless scanner, data is transferred to a base station that holds the data; a computer or USB key can then be connected to the base station to procure all data for future analysis.
How to choose the right scanner
The best possible scanner for your lab depends on which types of barcodes you use and the amount of throughput your lab deals with. A handheld scanner is ideal for most labs, whether cordless or corded. Labs that primarily use 2D barcodes should invest in a dedicated camera-based scanner, which can also be used to scan 1D barcodes. However, labs that scan a high volume of samples and specimens, such as those performing chemical screening or utilizing automated machinery, would likely benefit most from a fixed-laser scanner.
When selecting a scanner, it’s helpful to not only review the choices available but also partner with an experienced provider who can guide you to the choice that will fill your needs and optimize workflows across your lab. With the right company, it’s possible to create a complete solution encompassing handheld scanners alongside labels, software, and printers, ensuring all samples and inventory are tracked and traced accordingly, while minimizing errors.
