2011年12月29日星期四

One type of colorimeter named WPA CO7000 is so good that to use. This type is portable, so it is convent .There are some details I have to tell.

Colorimeter is a measurement and used in many of fields. It is a common measure instrument in a lot of companies or plants. One type of colorimeter named WPA CO7000 is so good that to use. This type is portable, so it is convent .There are some details I have to tell.
Usage
The Bookroom WPA CO7000 is a portable colorimeter designed for doctors and medical technologists in small and medium sized clinics.
Easy to use and clean  Colorimeter 
The CO7000 is very easy to use as there are only three buttons (On/Off, Reference and Test)with it. There is a drain hole at the bottom of the cell compartment so that spillages do not affect the instrument. The filters are at 400, 440, 470, 490, 520, 550, 580, 590, 680 and 700nm enabling assays in the wavelength range 400 to 700 nm to be measured. The wavelength required is selected by rotating an integral filter wheel.
Ideal for biochemical colorimetric analysis
Examples of routine assays that can be measured in serum and plasma include Cholesterol, Albumin, Total Protein, Glucose, Hemoglobin, Cretonne, Urea and those in cerebrospinal fluid include Glucose and Total Protein. The instrument has been designed as an “open” system so that test kits for clinical and medical applications from virtually any supplier can be used. The samples can be measured in either standard 10mm path length curettes (a minimum of 400µl is required) or in 10/12/16mm diameter test tubes (adapters are included with the instrument). 
Ideal for tropical and field conditions  Colorimeters  
The unit has been trivialized to protect it in hot and humid conditions (to 45°C and 70%, respectively); the 10 gelatin filters are encased in glass to prevent fungal growths appearing and the PCB has been conformably coated so that individual components are sealed to prevent corrosion. The instrument is powered by an internal rechargeable Nigh battery or by external power allowing it to be used where the power supply could be unreliable. Using the instrument connected to the mains electricity supply automatically recharges the battery.

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2011年12月28日星期三

The K-10 LF solves these frustrations with an accurate and fast colorimeter paired with it's easy to use companion PC program.

A colorimeter is a optical instrument which can measures color that absorbed by an object or substance. It determines color which based on the red, blue, and green components of light absorbed by the object or sample, much as the human eye does. When light passes through a medium, part of the light, and as a result, there is a decrease in how much of the light reflected by the medium. The device works on the basis of Beer-Lambert's law, which states that the absorption of light transmitted through a medium is directly proportional to the concentration of the medium. A colorimeter measures that change so users can analyze the concentration of a particular substance in that medium.
There two types of colorimeters I will to introduce: Lacier 526 Monitor's and K-10.
Firstly, the Lacier 526 Monitor's wide-gamut H-IPS POL panel covers an outstanding 100% of ISO Coated and 97% of Adobe RGB gamut. This industry-leading panel provides 12-bit gamma correction with 16-bit calculation precision, individual monitor uniformity correction, and Color Keeper backlight stabilizer. With its large 25.5’’ diagonal, wide 16:10 format, and high 1920x1200 resolution, it enhances productivity and allows full 1:1 scale display of 2 letter-size pages with extra space for toolbars. The included Lacier blue eye pro software offers a full-featured color management solution including automatic hardware calibration & ICC Profile creation, reference monitor matching, profile switching without recalibrating, calibration Test and Report, manual fine tuning, and ambient light analysis.
Secondly, the Klein K-10 LF is designed to save time, save money, produce accurate calibrations and then report this information to your customers. This equipment is designed to eliminate the frustration that professional calibrators have. One frustration is dealing with expensive spectroradiometers that are slow and laborious. Another frustration has to make do with equipment that doesn't accurately measure color, especially at low light. The K-10 LF solves these frustrations with an accurate and fast colorimeter paired with it's easy to use companion PC program. Every K-10 LF is individually calibrated. Each K-10 LF goes through an established calibration routine to get it accurate and to keep it accurate in the field. One of the calibrations involves thermal compensation which works behind the scenes, when you use it. So you don't have to worry about temperature changes when performing a calibration. This ensures continued superior accuracy at low light. Another calibration includes traceability to NIST. Documentation of this traceability is included with every K-10 LF we sell. The Klein K-10 LF measures all kinds of displays, not just projectors. We include 9 calibration files for various display types to give you the best accuracy in a variety of different applications. Every feature incorporated into the K-10 LF is designed to make your calibrations easier, faster and more accurate.
With the Klein PC Program you can create your own calibration files and set measuring parameters. Then data log, graph and export all in an easy to use interface.
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2011年12月21日星期三

Traditional and LED Lighting Products

Original Article: http://www.lisungroup.com/blog/the-replacement-of-traditional-lighting-with-led-products/


Whether semiconductor lighting technique can cause a new lighting revolution, totally depends on the performance, cost and the application prospects of LED itself. In recent years, high power LED has enhanced the efficiency and declined the cost at a breakneck speed, it has a broad prospect of application in the display, lighting as well as some special fields. But facing the competition of traditional technology, it is not as optimistic as people expected for LED to replace traditional light source in a big range. Especially in ordinary lighting area, there are many technical challenges need to conquer. The light efficiency, heat dissipation, life and reliability, light health problems to solve, price ratio also needs to dramatically increase. Therefore, our country LED industry now faces huge challenges and opportunities.
United States Department of Energy proposed a five-year LED development plan before the year of 2012, which deserves us thinking and learning from. Currently we attached more emphasis to use LED to “instead of” traditional lighting products, and use the traditional lighting standard to measure the performance of LED products. In fact, it is impossible to fully display all the LED characteristics under the present condition. LED is a kind of solid luminescent device of small power and light source, has the good directional light-out characteristics, and is easy for digital integrated process control. Therefore, how to break through the traditional form of light source based on the existing lighting standards to develop LED product, is the problem that faced with. That is, how we give play to the characteristics of LED based on the people’s needs of vision, health, environmental protection, is important problem for the “next generation” semiconductor lighting industry development.
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2011年12月7日星期三

Light Theory: V lamda Function

Original Article: http://www.lisungroup.com/blog/theories-about-light-part4-v-λ-function/


In order to have also a well defined photometer, an “artificial eye” has been constructed to simulate the light sensitivity of the human eye. The relative response of the normal human eye to monochromatic light at the different spectral frequencies was determined experimentally by the CIE and standardized in 1924. This is known as the photopic luminous efficiency function. The symbol of this function is V(λ) and it is usually expressed as a function of the wavelength of light (in air).
The following procedure was conducted to determine the photopic luminous efficiency function: First, light of constant intensity was emitted and its frequency was varied until the lightness perceived by the observer was found to be maximal. This occurred at a frequency of about 540 THz, corresponding to wavelength λm = 555 nm. The wavelength was then set to another λ and the power was readjusted until the lightness was judged to be the same as at λm. V(λ) could thus be computed as the ratio of the radiated power at λm and λ, respectively.
Of course, this experiment has been conducted by many observers and the resulting average was used to define the so called CIE standard eye which is an optical sensor with sensitivity corresponding to the function V(λ).
The photopic luminous efficiency function serves as a link between the subjective response of the human eye and normal physical measurement techniques. It thus provides the basis for a group of photometric units.
X-Rite – proprietary photopic filters consist of several elements designed to match the CIE photopic response curve to achieve an f1 to better than 1.5% at all wavelengths (f1 < 1.5 % defines the highest accuracy class L according to DIN 5032 and CIE No. 69). The sensitivity in the IR and UV range is reduced to a minimum < 0.1%. The careful design of the detectors ensures best-of-class equipment and repeatable measurement results, even for monochromatic radiation sources.
Precision operation amplifiers convert the photocurrent in nA resulting from the light sensation into a proportional voltage. The voltage is converted by a precision AD converter into a signal that is proportional to the expected illuminance (luminance meter) in lux.
Each Lisun’s  e – Optronik’sphotometer is carefully tested and calibrated in our own calibration laboratories with intensity calibration sources traceable to National standard (PTB); e.g., a WI41Gcalibration bulb operated under stable conditions (25°Cambient temperature), electrical values with a color temperature corresponding with CIE standard illuminant A (2856 K).
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