[Audio] Physics video assignment
topic: applications of lasers in barcode reader. 

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APPLICATIONS OF LASERS  IN  BARCODE READER

[Audio] What is bar code scanner?
A barcode scanner is a device that can read and interpret barcodes
The barcode scanner then decodes the barcode and sends the information to a computer or other device
Barcodes scanners are commonly used in retail settings to scan products at checkout.. 

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A barcode scanner is a device that can read and interpret barcodes.  Barcodes are a series of lines and spaces of varying widths that are printed on a product or package.  They contain data used for informational and marketing purposes. The barcode scanner uses a light source and a photodetector to read the barcode by shining a light on the barcode and measuring the amount of light that is reflected off of it.  The barcode scanner then decodes the barcode and sends the information to a computer or other device.  Barcode scanners are commonly used in retail settings to scan products at checkout, and they are also used in warehouses, libraries, and other settings to track and manage inventory.

[Audio] It's mechanism
A bar code consists of white and black bars. Reflections are strong in white areas and weak in black areas. The analog signal is converted into digital signal via an A/D converter.. 

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A bar code consists of white and black bars. Data retrieval is achieved when bar code scanners shine a light at a bar code, capture the reflected light and replace the black and white bars with binary digital signals. Reflections are strong in white areas and weak in black areas. A sensor receives reflections to obtain analog waveforms. The analog signal is converted into a digital signal via an A/D converter. (Binarization) Data retrieval is achieved when a code system is determined from the digital signal obtained. (Decoding process)

[Audio] Construction 1) laser source 2)rotating mirror 3) lenses 4)optical detector 5)programmable microprocesser. 

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CONSTRUCTION    Laser Source: This is used to emit the laser light, which is used as the main measuring medium.  Rotating mirror: This is a reflecting medium, which allows the light to pass through lenses.  Lenses: There are projection lenses to scan the light that falls on an object, using light sensors.  Optical detector: This is used to collect the information of light that passes through the object and send it to the signal processor to calculate the time.  Programmable microprocessor: This is used to give the final result by converting obtained information into dimensions.

[Audio] Laser method of scanning
Using laser allows reading of distant and wide bar code labels. 

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Using laser allows reading of distant and wide bar code labels. The Class 1 laser has a 670   nanometer (nm) beam is   commonly used in most laser   bar code scanners, while the   Class 2 features a 650 nm   beam. These l aser scanners use a laser beam as a light source and typically employ oscillating mirrors or rotating prisms to scan the laser beam back and forth across the barcode. A photodiode then measures the reflected light from the barcode. An analog signal is created from the photodiode, and is then converted into a digital signal.

[Audio] Advantages
It is a technology that is accepted universally
Has the ability in tracking data so that better decisions can be made Disadvantages
Barcode technology is a cost worthy process and the number of mis-reads are too high
It cannot read 2D codes. 

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ADVANTAGES  It is a technology that is accepted universally . Has the ability in tracking data so that better decisions can be made . They are also fast, capable of conducting up to 1,300 scans per second.

DISADVANTAGES  Barcode technology is a cost-worthy process  and the number of mis-reads are too high. It  cannot read 2D codes. The security issue is the most common issue of this and it is a disadvantage of this factor The physical damage of it needs additional costs to repair

CONCLUSION. Laser barcode scanners use a visible and repetitive flashing laser light beam, commonly used to track inventory and to purchases into a computerised management system. Barcodes are used as a mode of quick identification. They provide better accuracy, traceability and sorting abilities than relying on manually entered data . The laser barcode scanner may be safe for most humans ’ eyesight but exceptions are always a possibility!. 

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Laser barcode scanners use a visible and repetitive   flashing laser light beam, commonly used to track   inventory and to purchases into a computerised   management system. Barcodes are used as a mode of quick identification. They provide better accuracy, traceability and sorting   abilities than relying on manually entered data . The laser barcode scanner may be safe for most humans ’  eyesight but exceptions are always a possibility!

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APPLICATIONS OF LASERS 
IN 
BARCODE READER

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topic:applications of lasers in barcode reader

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A barcode scanner is a device that can read and interpret barcodes

The barcode scanner then decodes the barcode and sends the information to a computer or other device

Barcodes scanners are commonly used in retail settings to scan products at checkout.

A bar code consists of white and black bars.

Reflections are strong in white areas and weak in black areas

The analog signal is converted into digital signal via an A/D converter.

Using laser allows reading of distant and wide bar code labels

It is a technology that is accepted universally

Has the ability  in tracking data so that better decisions can be made

Barcode technology is a cost worthy process and the number of mis-reads are too high