Laser Scanner
Laser Scanner
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Help with building RGB LASER Scanner?
Hi there previously I have build some laser spyro projects but I have absolutely no idea about RGB LASER Scanners can someone please help.I have tried to find every possible information on the internet but I guess I need to start from the basics.
Thanks : )
there are several ways to do this, each involving different amounts of electro-optics in digital and analog forms.
you'll have to decide what you're scanning. is it 2D? 3D? still? or live-action?
in the easiest of cases, you can probably find an old photocopy machine and see how that works.
in the hardest case, your scanning data might become real-time input to a vehicle that must navigate through its environment.
so you will have a scanning beam, and a detector.
the scanning beam is a laser; you're interested in tri-colour, so this is either three lasers of different wavelengths, or it is a white-light laser that you will later filter. true white-light lasers are pulsed. if the pulse rate is really high (eg: in the millions of pulses/second), then each pulse could represent a pixel, and still have a mean free path of several meters.
the detector is a CCD photoreceptor, (or a whole lot of them), filtered to pass the desired wavelength(s). you can choose to capture:
a) a stream of individual bounces without regard to the focus;
b) a whole scan line into a buffer at once; or
c) a whole 2D frame into a buffer at once.
each method implies different mechano-optics, with a) being the simplest, mechanically. additionally, it may be possible to convert some digital cameras to use for this purpose.
to scan, you'll draw a point of light across a remote object, detecting the intensity of what bounces back. if this is not a range-finding device, then the outbound signal may be constant-intensity; but to detect distance, velocity, or absorption spectra, you will have to do some optical and/or high-speed tricks (sub-nanosecond processing is hard) involving correlating the outbound signal to the returned signal, to build a profile.
photon time-of-flight would indicate distance, (1 ns is about 30cm), and doppler shift would indicate speed.
to detect time of flight implies very high sensitivity and probably high frame rate, too.
to detect doppler shift and spectral lines would require that the returned beam travel through a prism, to give angular separation to the photon stream by wavelength. in this case, you'll always be scanning into a buffer, whose width covers the returned wavelengths.
each scan line would be drawn using a mirror that can tilt and swivel on two orthogonal axes. (or a pair of mirrors, arranged to swivel on orthogonal axes). controlling the mirror(s) will be subtle and delicate, because vibration may cause some fuzz in where the point gets drawn.
(think of a mechanism very similar to a DVD reader, for instance.)
for noise control, you'll want to distinguish between ambient light and returned signal.
Advantages of Barcode Scanners
A barcode reader (barcode scanner), also called a price scanner or point-of-sale (POS) scanner, is a hand-held or stationary input device used to capture and read information contained in a bar code. A barcode reader consists of a scanner, a decoder (either built-in or external), and a cable used to connect the reader with a computer.
There are five basic kinds of barcode readers each with its own unique advantage. Those are Pen wands, Slot Scanners, Charge-Couple Device (CCD) Scanners, Image Scanners, and Laser Scanners.
· A Pen Wand is a simple barcode reader which is known for its durability and low cost; does not contain any moving parts. It has to remain in direct contact with the bar code at a certain angle.
· A Slot Scanner remains stationary and the item with the bar code on it is pulled by hand through the slot. Slot scanners are typically used to scan bar codes on identification cards.
· A CCD Scanner often used in retail sales has a better read-range than the pen wand. A disadvantage of the CCD scanner is that it cannot read a bar code that is wider than its input face.
· An Image Scanner, also called as Camera reader, uses a small video camera to capture the image of the bar code and then uses sophisticated digital image processing techniques to decode the bar code.
· A Laser Scanner, either hand-held or stationary, does not have to be close to the bar code in order to do its job and can easily read a bar code up to 24 inches away. A laser scanning may perform up to 500 scans per second to reduce the possibility of errors.
Advantages of Barcodes: -
Barcode scanning systems provide an array of benefits, including operational efficiency, better customer service, and improved visibility of key business information to management.
A bar code label of twelve characters can be wanded in approximately the time it takes a keyboard operator to make two keystrokes.
Accuracy:
For every 1,000 characters typed by a keyboard operator, there are an average of ten keying errors. For an Optical Character Reader (OCR), there is one error in every 10,000 reads. With wands, barcode systems approach one error in every 3,000,000 characters, and with laser technology, they approach one error in 70 million entries.
Data Integrity:
When all the products or item data is Barcode scanned, it is free of human errors when data is entered. Barcode scanners works as a designed user interface that prevent the input of invalid data.
Probable number of substitution errors per 3,400,000 characters
Data Entry Meth -- Errors
Keyboard Entry -- 10,000
OCR Scanning -- 300
Barcode scanning(Code 39) -- 1
Ease of Implementation:
Operators of bar code scanners can learn to use the equipment effectively in less than 15 minutes. System costs are lower than other means of data entry because of the existence of interfacing hardware and software.
Cost Effectiveness:
Barcode systems have a demonstrated payback period of six to eighteen months, and they provide the highest level of reliability in a wide variety of data collection applications. Barcode systems create value not only by saving time, but also by preventing costly errors.
Information is the most valuable asset for any organization. Every organization should protect its operations data with reliable data management by ensuring data accuracy and availability. Barcode Scanners equipment helps firms in maintaining accurate supply chain and operations data management.
For over 20 years, System ID has provided automation solutions and barcoding equipment to a wide range of large and small companies in virtually every industry sector. System ID offers more than 10,000 brand name products and services such as Symbol Barcode Scanner and Symbol Scanners.
About the Author
For over 20 years, System ID has provided automation solutions and barcoding equipment to a wide range of large and small companies in virtually every industry sector. System ID offers more than 10,000 brand name products and services such as Symbol Barcode Scanner and Symbol Scanners.
Sticky Light - the smart laser scanner revisited
