CN100587442C - System for measuring responsive time of automatically light-changing goggles - Google Patents

Abstract

The invention relates to a measuring system of automatic light change goggles response time, in particular to a measuring system of automatic light change goggles response time making use of laser, modulated infrared light, electronic technology and computer technology. The invention consisting of a testing light source, a triggering unit, a signal reception/pretreatment unit, a digital signal treatment/control unit and a power module is characterized in that: the bright and dim status conversion of the liquid crystal screen of the goggles to be measured is controlled by the infrared triggering light source through a computer, the variation of the transparency degree of the goggles is also detected simultaneously, and thus the response time or turn-off and recovery time of the goggles canbe worked out. The invention has the advantages of simple structure, portability, energy conservation and consumption reduction, as well as convenient use. The invention which adopts a Europe standardof BS EN379-2003 is applicable to testing the response time of the automatic light change goggles capable of protecting eyes against radiation in electric welding, gas welding and arc light surroundings.

Description

System for measuring responsive time of automatically light-changing goggles

Technical field:

The present invention relates to the test of security protection articles for use response time, be specifically related to system for measuring responsive time of automatically light-changing goggles.

Background technology:

The Europe and the U.S. just protect automatic light-changing protective glass that the arc light of generations such as electric welding, gas welding damages human eye and have issued series of standards (as the BS EN379-2003 in Europe and the NSIZ871 of the U.S.) since the nineties in last century, a wherein the most key standard is exactly the mensuration of response time (turn-off time and release time) and shade number, and this index is to weigh the important parameter of safety goggles grade and quality.System for measuring responsive time of automatically light-changing goggles (RTMS) is to realize system that automatic beam change Eye protector for welder response time and shade number are tested and demarcated.

The key component of automatic beam change face shield is exactly an automatic light-changing protective glass, in recent years along with opening, the expansion of domestic and international market, and development of technology, the automatic beam change face shield of more domestic manufacturer production constantly squeezes into the international market, and has obtained good economic benefit.Usually owing to there is not the detection of standard compliant test macro, manufacturer generally adopts photometer, means such as oscillograph come automatic light-changing protective glass is carried out rough detection and demarcation, the outlet that makes product is in grade and discount qualitatively, the interests of producer have been influenced, and national labour protection quality testing center has proposed requirement to the needs of the evaluation of the quality of automatic light-changing protective glass to the automatic light-changing protective glass Response Time Test System.The present domestic checkout equipment that does not also have this standard compliant special use, and do not seen the similar products report abroad yet.

Summary of the invention:

The objective of the invention is to aim at the international market, (BS EN379-2003) develops a kind of system for measuring responsive time of automatically light-changing goggles (RTMS) according to European standard, promptly adopt corresponding infrared ray in the LED infrared light supply simulation arc light of certain modulating frequency to do the triggering source of automatic light-changing protective glass, allow the green spectrum scope that sees through according to the automatic beam change face shield, adopt the semiconductor pumped green laser source of miniwatt (5mW) to replace arc light (or standard A light source) as testing light source.Adopt 24 AD signal to be made the detection of great dynamic range and relevant Digital Signal Processing scheme with visible light PIN, both kept the RTMS volume little, cost is low, and is energy-saving and cost-reducing, is convenient to again manipulate and higher measuring accuracy.

The technical scheme of system for measuring responsive time of automatically light-changing goggles of the present invention realizes in the following manner:

System for measuring responsive time of automatically light-changing goggles, by the testing light source module, trigger module, signal reception/pretreatment module, digital signal processing control module and power module constitute.It is characterized in that this system testing light source module is to adopt the 532nm green (light) laser of 5mW low-power consumption semiconductor pumping and light source to drive I with light-operated feedback control system, in order to replace the green spectrum in 2856K standard sources A or the arc light; Trigger module drives II by infrared LED and the light source that can modulate to be formed, in order to the trigger action of simulation arc light; Signal reception/pretreatment module is by visible-light detector PIN and amplification, filtering accordingly, and A/D conversion and interface circuit constitute; Digital signal processing control module constitute by computing machine and corresponding testing software; Power module is the Switching Power Supply that an alternating current 220V is transformed into direct current ± 5V.

Technique effect of the present invention is:

1. adopt corresponding infrared ray in the LED infrared light supply simulation arc light of certain modulating frequency to do the triggering source of automatic light-changing protective glass, the semiconductor pumped green laser source of the low-power consumption high brightness that adopts replaces arc light (or 2856K standard sources A) as testing light source, these make the power consumption of system reduce (＜2W), 150 * 95 * 265) and longer serviceable life can play energy-conservation effect structure is become simply, light small and exquisite (instrument size (mm):.

2. use light-operated feedback control system to guarantee the stability of testing light source, improved measuring accuracy and measurement result stability.

3. adopt vertical layout structure to exempt the anchor clamps of fixing tested liquid crystal display.

4. filled up domestic blank at automatic light-changing protective glass response time special test equipment.

Description of drawings:

Accompanying drawing 1 is an automatic light-changing protective glass Response Time Test System schematic diagram of the present invention.Primary structure is testing light source module (1) among the figure; Trigger module (2); Signal receive pretreatment module (3); Digital signal processing/control module (4); Power module (5).

Accompanying drawing 2 is the circuit diagram of automatic light-changing protective glass Response Time Test System of the present invention.(a) drive the I circuit for light source; (b) be the trigger module circuit; (c) for signal receive pretreatment module before put, filtering circuit; (d) for signal receive in the pretreatment module be the A/D translation circuit; (e) for signal receive in the pretreatment module be interface circuit.

Accompanying drawing 3 is the test curve figure of automatic light-changing protective glass Response Time Test System of the present invention.(a) be the response time curve; (b) be curve release time.

Embodiment:

Testing light source module of the present invention (1) is to drive I by 532nm green (light) laser and light source to constitute, and wherein (a) of light source driving I such as accompanying drawing 2 is made up of light-operated feedback system and driving circuit.Because the stability of testing light source is very big to the precision and the stability influence of test result, so testing light source must have light control system, when light source power fluctuateed, light control system reached the purpose of stabilized light source to the variation that light source driving circuit provides a negative-feedback signal to suppress light source;

Trigger module (2) drives II by 780nmLED and light source and constitutes, wherein (b) of light source driving II such as accompanying drawing 2 is made up of led drive circuit, LED produces certain frequency (≤15kHz) modulated infrared light overturns the liquid crystal display transmitance with the infrared eye that triggers safety goggles to be measured when trigger pip.

Signal receive pretreatment module (3) be by the PIN detector, precedingly put, mainly put, low-pass filtering, A/D conversion and interface circuit constitute, and respectively as (c) of accompanying drawing 2, (d), (e) scheme.Wherein PIN changes the light signal that receives into electric signal, by preceding putting this weak signal is amplified, remove high frequency noise and further amplify desired signal by low-pass filter again, by the A/D conversion simulating signal is become digital signal then, the interface circuit that constitutes by single-chip microcomputer, storer etc. with digital signal gather, buffer memory sends into computing machine at last and handles.

Digital signal processing/control module (4) is to be made of computing machine and corresponding software, in order to the control of system, processing, analytical calculation, preservation and the output of data;

Power module (5) is one the 220V alternating current converted to ± Switching Power Supply of 5V direct current.

The innovation part at first is to adopt corresponding infrared ray in the LED infrared light supply simulation arc light of certain modulating frequency to do the triggering source of automatic light-changing protective glass, can avoid the complex structure of electronic shutter, volume is huge relatively and use inconvenience, and the flexibly changing modulating frequency is analyzed the triggering Hz-KHz of automatic light-changing protective glass with realization again; They are two years old, allow the green spectrum scope that sees through according to the automatic beam change face shield, the semiconductor pumped green glow 532nm lasing light emitter that adopts replaces arc light or 2856K standard sources A as testing light source, make the power consumption of system reduce, can play energy-conservation effect can make structure become simple and light again and increase the service life, use feedback control system to guarantee the stability of testing light source, improved measuring accuracy and measurement result stability.Its three, establishment have system control, data processing, calculating, preservation, demonstration, a testing software of the output of test report and test curve analytic function according to European standard BSEN379-2003; They are four years old, the Response Time Test System scheme: the infrarede emitting diode LED that native system adopts the certain frequency modulation as pumping signal trigger automatic light-changing protective glass bright/dark attitude upset, utilization comes the green glow semiconductor laser of stabilized light source power to replace arc light or standard sources A as testing light source with light-operated feedback control system, sending trigger pip by the computer control infrared LED overturns automatic light-changing protective glass, utilize detector to write down the light intensity that this process sees through safety goggles, adopt European standard BS EN379-2003 to detect the response time, i.e. shutoff/release time.

When instrument began test job, computing machine sends test instruction made system according to predefined program run:

Keep testing light source to connect, synchronous signal reception/pretreatment module begins to gather the intensity signal that sees through from safety goggles (liquid crystal display to be measured): beginning is bright attitude intensity signal, behind the certain hour, trigger module work, the infrared eye that infrared (about 780nm) light that LED sends certain modulating frequency and intensity arrives liquid crystal display to be measured triggers the upset (becoming dark attitude by bright attitude) of screen, at this moment record is bright dark attitude conversion and dark attitude transmitance information, again after a period of time, trigger module quits work, liquid crystal display to be measured returns to bright attitude by dark attitude, what noted this moment is that liquid crystal display recovers section percent of pass information, has suffered gatherer process and continues about 1 time in second approximately.Printing opacity information when the screen to be measured that will collect is then changed by bright dark attitude is passed computing machine back, carries out analyzing and processing by digital signal processing module, and calculates release time response time by formula (1), (2):

$\mathrm{ts}=\frac{1}{{\mathrm{\τ}}_1}{\∫}_{t=0}^{t(\mathrm{\τ}\left(t\right)={3\mathrm{\τ}}_2)}\mathrm{\τ}\left(t\right)\mathrm{dt}....\left(1\right)$

tr＝t ₁-t ₀…(2)

Wherein response time ts (turn-off time), release time tr; T=0 is the moment (triggering the moment of liquid crystal display to be measured corresponding to trigger module) that produces arc light; τ ₁It is bright attitude transmitance; T=t (τ (t)=3 τ ₂) be that transmitance is reduced to the darkest transmitance (τ ₂) moment 3 times times; τ (t) is the transmitance after arc light triggers; t ₀Be that trigger module down trigger liquid crystal display begins to have the moment of dark attitude to bright attitude recovery; t ₁Be the moment of liquid crystal display when recovering fully, its test curve such as accompanying drawing 3:

The present invention is a kind of special test equipment, is applicable to electric welding, and the protection human eye exempts from test and the analysis of the automatic light-changing protective glass response time of high light radiation in the arc light environment such as gas welding.

Claims (1)

1 one kinds of system for measuring responsive time of automatically light-changing goggles, by testing light source module (1), trigger module (2), signal reception/pretreatment module (3), Shuo Zixinhaochuli control module (4) and power module (5) constitute; It is characterized in that this system testing light source module (1) is to adopt the semiconductor pumped 532nm green (light) laser of 5mW low-power consumption and light source to drive the I formation, in order to replace the green spectrum in 2856K standard sources A or the arc light, wherein light source driving I is made up of light-operated feedback system and driving circuit I; Trigger module drives II by infrared LED and the light source that can modulate and forms; Signal reception/pretreatment module is by visible-light detector PIN and corresponding amplification, low-pass filtering, and A/D conversion and interface circuit constitute; Digital signal processing control module constitute by computing machine and corresponding testing software; Power module is the Switching Power Supply that an alternating current 220V is transformed into direct current ± 5V.

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