Flashing Effect of the Light Source and the Measuring Method|Part3: Flashing Harm to Human Eyes
Light source flashing has the stimulation effect on the human vision system, and will produce the uncomfortable feeling. People work or live in the sparkling light for a long time, which may affect the physicalhygience and mental hygiene. This stimulation effect or and influence may be connected with the light source flashing intensity, the frequency, [...]
Measurement and Evaluation of the Safety of UV Light Sources|Part3: Principle of Measurement
Spectral radiation method: for each spectral radiation power of the light source measured on each wavelength, after the weighted integral of the spectral data integral or biological light receiving response function for the corresponding wave band by using the computer, we can receive the irradiance (or radiant power) of the specified wave band and the [...]
Flashing Effect of the Light Source and the Measuring Method|Part2: Causes of Light Source Flashing
The light source flashing is actually the subjective feeling of the reaction chain from voltage variation, flux fluctuation (Flux Meter), eyes to human brain. The technology mechanism of the stroboflash includes power supply, electric light source property, as well as the unsuitable illumination design and so on. The following is the general technical analysis of [...]
Flashing Effect of the Light Source and the Measuring Method|Part1: Basic Concept of Flashing
Abstract： This paper has introduced the basic concept of the flashing light source, the causes, and discussed all kinds of harm of the flashing light source and the flashing effect, stated the evaluation and measurement method of the flashing, finally measured the flash intensity of several typical light source. Thee data and the analysis result [...]
Measurement and Evaluation of the Safety of UV Light Sources|Part2: Safety Requirements of UV Light Source
Skin and eye photochemical ultraviolet harm aeration limit The irradiation time is within 8 hours (the situation of over 8 hours is not considered), the aeration limit of the effective up radiation incident to the eyes and the skin without the protection is 30J•m-2. In order to protect the eyes or the skin from the [...]
Measurement and Evaluation of the Safety of UV Light Sources|Part1: Abstract and Introduction
Abstract Based on risk criteria and exposure limits of ultraviolet (UV) light source prescribed in the new IEC and Chinese National Standards, this paper describes something about evaluating hazards to human eyes and skin. Then it describes the way and principle about testing UV light source. In the end, it shows and analyzes the results [...]
Difference Between the Electrostatic Generator and Electrostatic Discharge Generator
Electrostatic generator is mainly to produce the static. The output is usually the single polarity such as positive or negative polarity, the output voltage is adjustable, and it is usually applied in the scientific research, electrostatic application such as electrostatic precipitation, electrostatic spraying, biological effects study and other electrostatic fields. Electrostatic generator has lower voltage [...]
Electromagnetic Compatibility (EMC) Design for Vehicle Electronic Equipment 2
3 Cable selection and laying Because the cable can receive radiation and electromagnetic wave antenna efficiently, also is the good conduction channel of the interference, the vast majority of the equipment EMC problem is caused by cable, in order to solve the problem of cable, the main method is shielding the cable, so this equipment [...]
AC Stabilized Voltage Power Supply
AC voltage stabilizer is such a kind of electronic device that can provide a stable ac power source. The parameters of the ac voltage stabilizer and the quality index can refer to the DC stabilized power source. All kinds of electronic device require stabilized ac power source for power supply, especially after the application of [...]
Electromagnetic Compatibility (EMC) Design for Vehicle Electronic Equipment 1
The solution includes digital ammeter, digital voltmeter, switch, circuit breakers, control and protection unit, mutual inductor, contactor and other components. Among them digital ammeter, digital voltmeter, switch, circuit breaker are arranged on the front panel of the case. Control and protection unit, mutual inductor, contactor and other components are arranged in case. This equipment should meet the [...]
Distribution and Radiation Method for Measuring the Ultraviolet Radiation Flux 3: The Measuring System
Based on the characteristics of the above four kinds of measuring system, we have adopted light source movement method, as shown in figure 2. The measuring light source can rotate around the horizontal axis that is the same with the light source axis, and can rotate around the vertical axis that is perpendicular to the [...]
Building Energy Saving and Luminous Environment Design
In recent years, building energy saving is required by the energy crisis, environmental protection and the improvement of living standards. Building energy saving has been the common choice of world’s architectural community after thoughtful for a long time. So, what is exactly energy-saving building, what is its benefit, why does everybody concern about it so [...]
Distribution and Radiation Method for Measuring the Ultraviolet Radiation Flux 2: Principles
Principle of measurement The measuring principle of distribution and radiation method is based on the spherical coordinate system, as shown in picture 1. Picture 1 spherical coordinate system Through measuring the irradiance of the sphere surface, if the light source is taken as the origin of the spherical coordinate, θ is taken as the polar [...]
Distribution and Radiation Method for Measuring the Ultraviolet Radiation Flux 1: Definition and Characteristics of Ultraviolet Radiation
Abstract: In recent years, with more and more attention is paid to the UV light source, people attach more importance to the evaluation. The total radiation flux is one of the most important technology indexes of UV light source. This paper describes the basic principle and method of using the distribution Spectrophotometer to measure the [...]
Professional Knowledge About LED Electrostatic 4
Question: How to effectively improve LED a static ability? What are the protective measures? There are no direct measures to improve LED antistatic ability, or once LED is produced out, its antistatic index is confirmed. There is no effective method to improve its antistatic index. If LED antistatic ability is not high enough, we can [...]
Color Temperature and Brightness
Color Temperature （Color Temperature Meter） Unite: Absolute Temprature (Kelvin, K) Unite of color temperature is absolute temperature K. When heat one black body radiator, for example Platinum, color of the black body radiator will change from Red, to Orange, Yellow, Green, Blue, Cyan, Purple gradually. We can use this character of black body to definition [...]
Professional Knowledge About LED Electrostatic 3
Question: which kind of method can be used to evaluate and test the antistatic ability of LED? Most of the enterprise evaluates the antistatic ability of LED with the attitude of having a try. Actually, this is an assessment method of long cycle length, great error, high cost and risk. Millimeter is used to test [...]
Calculation Model for LED Lighting Heating Transfer|LED Thermal Resistance Algorithm
Take a calculation for example, this shows the equivalent circuit of the LED thermal resistance algorithm. Following is the basic structure that lamps requirements, LED was enclosed in a sealed plastic enclosure, the right side of the insulation blanket is thicker, and the heat conduction basic can be neglected comparing the other part of the thermal [...]
Professional Knowledge About LED Electrostatic 2
Question: What is the principle and process of LED breakdown and damage by LED static? LED belongs to the semiconductor components, its PN junction is directly bared outside, it is easy to be damaged by the static. When the electric charge of different polarities on the two poles of LED (induction produces the charge produced [...]
LSG-1800: Automatic Goniophotometric Measurement System
This horizontal goniophotometer is another goniophotometric system that we often use. The test distance of the detector of the test system is between 1.41m and 11.41m. The lamp is installed on the turntable that can rotate around the horizontal and vertical direction. The vertical axis line of the turntable is fixable, the horizontal axis is [...]
