Device and method for measuring shade number of automatic darkening welding filter

An automatic dimming and optical filter technology, applied in the direction of testing optical properties, can solve the problems of unfavorable industrial production product quality online monitoring, time-consuming, cumbersome calculation process, etc., to achieve large-scale rapid measurement, fast and simple process, single good color effect

Inactive Publication Date: 2012-05-09
SHANGHAI INST OF WORK SAFETY SCI
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  • Application Information

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Problems solved by technology

However, there are many disadvantages in this technical solution. This method not only requires a large and expensive testing equipment - a spectrophotometer,

Method used

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  • Device and method for measuring shade number of automatic darkening welding filter
  • Device and method for measuring shade number of automatic darkening welding filter
  • Device and method for measuring shade number of automatic darkening welding filter

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Embodiment Construction

[0025] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0026] The test method for the shading number stipulated in the national standard is as follows: First, use a spectrophotometer to measure the transmittance of the filter between 380-780nm and read the transmittance every 1nm, and then introduce the spectral correction coefficient of the light source and the human eye. Calculate the average transmittance τ from the sight function v , and then use the shading number definition formula (1) to calculate its shading number N.

[0027] N = 1 + 7 3 lg ( 1 τ v ) - - - ( 1 )

[0028] in τ v...

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Abstract

The invention discloses a device for measuring the shade number of an automatic darkening welding filter, comprising a laser, a photoelectric detector and a signal processing unit, wherein laser light emitted by the laser is received by the photoelectric detector after passing through the filter and then converted into an electric signal; and the electric signal is processed by the signal processing unit to obtain the shade number of the tested filter, wherein the wavelength of the laser light is 532 nm; and the computational formula of the signal processing unit is N=B+klog10I, wherein N is the shade number, I is a current or a voltage, and B and k are the parameters of the test system. The invention also discloses a method for measuring the shade number of an automatic darkening welding filter.

Description

technical field [0001] The invention relates to equipment for personal protection during welding operations, in particular to a device and method for measuring the shading number of an automatic darkening welding filter in the equipment. Background technique [0002] Auto-darkening welding filter is a key component of welding eye protection. It can not only provide the operator with a clear vision, accurately locate the welding spot, but also effectively block ultraviolet and infrared rays in strong light and arc light. The optical performance index of the welding filter is mainly a series of indexes based on the transmittance, including the transmittance of each band, the uniformity of the transmittance, the angular dependence of the transmittance, and the shading number. Among them, the shading number is used to indicate the transmittance level or darkness of the filter, and it is the only reference index for welders to choose to use welding filters according to different ...

Claims

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Application Information

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IPC IPC(8): G01M11/02
Inventor 商景林王翔童遂放邵宝仁张宏荃
Owner SHANGHAI INST OF WORK SAFETY SCI
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