HEPA Filter

... 1. Thế nào là HEPA Filter :HEPA stands for "High-Efficiency Particulate Air" [1]. A HEPA filter is a type of air filter that satisfies certain standards of ... function are fibre diameter, filter thickness, and face velocity. The air space between HEPA filter fibres is much greater than 0.3 μm. The common assumption that a HEPA filter acts like a sieve ... En...

Ngày tải lên: 10/10/2012, 11:08

... Single Bank of HEPA Filters HEPA Filters and Filter Testing: In-Service & In-Place Tests for HEPA Filters 16 In performing an in-place test, the filter bank is treated as a single filter. Just ... efficiency and has been scan tested. HEPA Filters and Filter Testing: In-Service & In-Place Tests for HEPA Filters 14 The most stringent factory tests for HEPA filters h...

Ngày tải lên: 24/04/2014, 10:47

... 1. Thế nào là HEPA Filter :HEPA stands for "High-Efficiency Particulate Air" [1]. A HEPA filter is a type of air filter that satisfies certain standards of ... function are fibre diameter, filter thickness, and face velocity. The air space between HEPA filter fibres is much greater than 0.3 μm. The common assumption that a HEPA filter acts like a sieve ... En...

Ngày tải lên: 18/08/2012, 23:14

... a band-pass filter. As shownin (a), a band-pass filter can be formedby cascading a low-pass filter and ahigh-pass filter. This can be reduced toa single stage, shown in (b). The filterkernel ... low-pass and high-pass filter kernels canbe combined to form band-pass and band-reject filters. In short, adding thefilter kernels produces a band-reject filter, while convolving the filter...

Ngày tải lên: 13/09/2012, 09:50

... that the moving average filter is a convolution using avery simple filter kernel. For example, a 5 point filter has the filter kernel: . That is, the moving average filter is aþ 0, 0, 1/5, ... average filter better than the movingaverage filter itself? Three ways: First, and most important, these filters havebetter stopband attenuation than the moving average filter. Second, th...

Ngày tải lên: 13/09/2012, 09:50

... a single filter. The kernel of the combined filter is equal to the convolution of the filter kernels of the two stages. This also means that convolving any filter kernel with itself results in a filter ... Processing294 100 'LOW-PASS WINDOWED-SINC FILTER 110 'This program filters 5000 samples with a 101 point windowed-sinc filter, 120 'resulting in 4900 samples of...

Ngày tải lên: 13/09/2012, 09:50

... designed to have a rectangular pulse for a filter kernel. In comparison, the filter kernel of the matched filter looks like the signal being detected. The Wiener filter is designed in the frequency ... Moving average filter Sample number 0 100 200 300 400 500 -0.5 0.0 0.5 1.0 1.5 b. Matched filter FIGURE 17-9 Example of using three optimal filters. These signals result from filter...

Ngày tải lên: 13/09/2012, 09:50

... 40 -0.5 0.0 0.5 1.0 1.5 R C Digital Filter Analog Filter Recursive Filter a 0 = 0.15 b 1 = 0.85 FIGURE 19-2 Single pole low-pass filter. Digital recursive filters can mimic analog filters composed of resistors ... 100 -0.5 0.0 0.5 1.0 1.5 2.0 i. Pulse response Zero Phase Filter Linear Phase Filter Nonlinear Phase Filter FIGURE 19-7 Zero, linear, and nonlinear phase filters. A z...

Ngày tải lên: 13/09/2012, 09:50

... two filters. Both are bad, as you should expect for frequency domain filters. The recursive filter has a nonlinear phase, but this can be corrected with bidirectional filtering. Since both filters are ... digital filters is almost always plotted on a linear frequency scale, while analog filters are usually displayed with a logarithmic frequency. This is because digital filters need Chapter...

Ngày tải lên: 13/09/2012, 09:50

... Windowed FIR Filters Using MATLAB 2735.4.1 Estimation of Filter Order 2735.4.2 Design of the FIR Filter 2755.5 Equiripple Linear Phase FIR Filters 2805.6 Design of Equiripple FIR Filters Using ... Approximation 2124.3 Analog Frequency Transformations 2124.3.1 Highpass Filter 2124.3.2 Bandpass Filter 2134.3.3 Bandstop Filter 2164.4 Digital Filters 2194.5 Impulse-Invariant Transformat...

Ngày tải lên: 13/09/2012, 10:21