how to create barcode in vb.net 2008 The Role of Sensors in the 21st Century in Software

Make Code 128 Code Set A in Software The Role of Sensors in the 21st Century

The Role of Sensors in the 21st Century
Decode Code 128B In None
Using Barcode Control SDK for Software Control to generate, create, read, scan barcode image in Software applications.
Code 128B Drawer In None
Using Barcode generation for Software Control to generate, create Code 128 image in Software applications.
unit area. We won t delve any further into this subject because it is so seldom used. Many different standard units of measurement exist for luminance, some of which are listed next. Candela per square inch (cd/in ) Foot-lambert (luminance of a surface emitting one lumen per square foot) Lambert (similar, but per square cm). 1 cd/in = 452 foot-lambert 1 lambert = 929 foot-lambert = 2.054 cd/in Our eye sees brightness, not illumination. Every visible object has brightness. Usually, brightness is proportional to the object s illumination, so a well-illuminated object seems brighter. For a properly diffusing reflecting surface: foot-lamberts = foot-candles surface re ectance
Code 128B Scanner In None
Using Barcode reader for Software Control to read, scan read, scan image in Software applications.
Painting Code 128C In C#.NET
Using Barcode encoder for .NET framework Control to generate, create Code 128 Code Set A image in Visual Studio .NET applications.
Foot-Candle to Lux Conversion
ANSI/AIM Code 128 Encoder In VS .NET
Using Barcode creator for ASP.NET Control to generate, create Code 128 Code Set B image in ASP.NET applications.
Encode ANSI/AIM Code 128 In Visual Studio .NET
Using Barcode generator for .NET framework Control to generate, create Code 128 Code Set C image in Visual Studio .NET applications.
One foot-candle is the illumination produced by one lumen uniformly distributed over one square foot of surface, and lux is the illumination over one square meter of surface (Fig. 1.20). Therefore, one lux = 0.0929 foot-candles. Or, approximately: 1 Fc = 10 lux
Code 128 Printer In VB.NET
Using Barcode drawer for .NET Control to generate, create ANSI/AIM Code 128 image in Visual Studio .NET applications.
Generate Barcode In None
Using Barcode drawer for Software Control to generate, create barcode image in Software applications.
Illumination at the center = E2
UPC-A Supplement 5 Generator In None
Using Barcode printer for Software Control to generate, create UPC-A image in Software applications.
Code-39 Drawer In None
Using Barcode printer for Software Control to generate, create Code 3 of 9 image in Software applications.
Illumination at the center = E1
GS1 - 13 Creator In None
Using Barcode generation for Software Control to generate, create EAN / UCC - 13 image in Software applications.
Code 128 Maker In None
Using Barcode generator for Software Control to generate, create ANSI/AIM Code 128 image in Software applications.
Distance = D2 Distance = D1 Point Source
USPS POSTal Numeric Encoding Technique Barcode Encoder In None
Using Barcode creator for Software Control to generate, create USPS POSTNET Barcode image in Software applications.
Paint EAN / UCC - 14 In Objective-C
Using Barcode creation for iPhone Control to generate, create UCC.EAN - 128 image in iPhone applications.
FIGURE 1.20
Data Matrix Encoder In Java
Using Barcode creation for Android Control to generate, create Data Matrix ECC200 image in Android applications.
Data Matrix Generator In Visual Studio .NET
Using Barcode drawer for ASP.NET Control to generate, create Data Matrix ECC200 image in ASP.NET applications.
Illumination inverse square law representation.
Data Matrix ECC200 Printer In Visual Studio .NET
Using Barcode creation for VS .NET Control to generate, create Data Matrix 2d barcode image in VS .NET applications.
Code 39 Encoder In C#
Using Barcode generator for VS .NET Control to generate, create USS Code 39 image in Visual Studio .NET applications.
One
Barcode Maker In VS .NET
Using Barcode drawer for Visual Studio .NET Control to generate, create bar code image in .NET framework applications.
Generate Bar Code In Visual Studio .NET
Using Barcode generation for .NET framework Control to generate, create bar code image in .NET applications.
1.15.5 The Inverse Square Law
The inverse square law tells us that the illumination is inversely proportional to the square of the distance between the point source and the surface, in other words: E1 D2 = 2 2 E2 D1 If you have a fixture that can be treated as a point source, where the distance from the surface is large, and you measure the illumination at 20 feet as 2000 Fc at the beam center, then at 40 feet the illumination is 500 Fc at the beam center.
1.15.6 The Cosine Law
Effective illumination is proportional to the cosine of the angle of incidence of the light on the surface. It is the angle between the direction of the light and the perpendicular to the surface (Fig. 1.21). E2 = E1 cos = E1 sin Here are a few cases: When the surface is tilted by an angle of 30 , the illumination is reduced by a factor of 0.87 45 0.71 60 0.5
FIGURE 1.21 Illumination at the O point on surfaces 1 and 2.
Source
90
O E2
The Role of Sensors in the 21st Century
1.15.7 The Difference Between Lumen and Watt
Lumen is a unit of the photometric system and Watt belongs to the radiometry system. Both characterize a power of light flow. However, lumen is power related to human eye sensitivity. Therefore, lights with the same power in watts, but that are different colors have different luminous fluxes, because the human eye has different sensitivity at different wavelengths. At a wavelength of 555 nm (maximum eye sensitivity), 1 watt equals 683 lumens (lm). High-power sources of infrared radiation produce no lumen output, so the human eye can t see it. However, in order to calculate the total power absorbed by a surface to estimate temperature increase, for example, lumen flux must be transferred to watts. This can be done by using a spectral luminous efficiency curve, which can be found in many photometry handbooks.
Calculating Beam Angles
If the distance from a fixture to the screen is known (which is a much larger value than fixture length), as well as the image diameter (Fig. 1.22), then: = 2 arctan D 2L
D - image diameter Screen
L - distance
Fixture
FIGURE 1.22
Calculation of beam angle.
One
In most practical cases, the following approximation is true: = 57 . 3
Example: distance = 20 feet image diameter = 5 feet Exact formula gives the angle = 14.25
In the case of a soft edge light image diameter, it is usually measured at the point where illumination is 50 percent (beam angle) or 10 percent (field angle) of the center illumination.
Calculating Lumens Output Luminous Flux
The beam radius is divided into n equal parts (radii and illumination reading values are indexed from 0, at the beam center, to n 1, at the beam edge). See Fig. 1.23.
Calculating Center and Edge Points Two Points:
P = 2 . 1R 2 (E1 + 0 . 5E0 )
1.15.11 Calculating Center, Middle, and Edge Points Three Points:
P = 1 . 3R 2 (E2 + 1 . 2E1 + 0 . 2E0 )
Beam Profile E0 E1
En 1 Radius Rn 1 = Rbeam
R0 = 0 R1
FIGURE 1.23
Calculation of lumens output.
The Role of Sensors in the 21st Century
Calculating Four Calculation Points:
P = 0 . 93R 2 (E3 + 1 . 5E2 + 0 . 75E1 + 0 . 125E0 )
Calculating Five Calculation Points:
P = 0 . 72R 2 (E4 + 1 . 64E3 + 1 . 09E2 + 0 . 55E1 + 0 . 09E0 )
Calculating Eight Points:
P = 0 . 43R 2 (E7 + 1 . 8E6 + 1 . 5E5 + 1 . 2E4 + 0 . 9E3 + 0 . 6E2 + 0 . 3E1 + 0 . 05E0 ) where P = total lumens R = beam radius E = illumination In the case of a soft edge fixture, where the image size is taken at 10 percent of the center illumination (field angle), the formula becomes: P = 1 . 26R 2Ecenter
Copyright © OnBarcode.com . All rights reserved.