CN102680106A - Photoelectric measurement method and device for utilizing thermocouple to monitor SSL (Secure Socket Layer) lighting products - Google Patents

Abstract

The present invention provides a method for using thermocouples to monitor the photoelectric measurement of SSL lighting products: it includes the following steps: ① setting and calibration system for the initial measurement conditions of the integrating sphere test system; Carry out the test; wherein, during the conventional photoelectric test on the SSL lighting product, the temperature of the SSL lighting product is monitored by thermocouples, and the photoelectric measurement is carried out when the temperature is stabilized by the thermocouple monitoring system. The present invention also provides an integrating sphere measuring device utilizing a thermocouple to monitor temperature, including an integrating sphere used for photometric and chromaticity measurements, and a thermocouple probe for measuring the temperature at a preset position in the integrating sphere is arranged inside the integrating sphere . By setting up a thermocouple temperature control system, the temperature monitoring of the photoelectric test process of SSL lighting products in the integrating sphere can be realized, and the function relationship between the measurement results such as luminosity and chromaticity relative to the temperature can be established to effectively monitor the SSL lighting products Structural and Life Analysis.

Description

Method and device for monitoring photoelectric measurement of SSL lighting products by using thermocouple

technical field

The present invention relates to a test method for semiconductor lighting products (hereinafter referred to as SSL products), using a 4π or 2π integrating sphere test system as a carrier, especially relates to photoelectric measurement suitable for IES-LM-79, and belongs to the technical field of electric light source and lighting measurement.

the

Background technique

When performing photometric and chromaticity measurements on SSL products, the sample needs to reach a stable state. According to the definition and requirements of IES LM-79, the stabilization time is generally 30 minutes (small integrated LED lights) to 2 hours or longer (large SSL lighting equipment). In order to achieve a stable thermal state, when the readings of the light output and electric power of the product within 30 minutes (15 minutes interval) do not change by more than 0.5%, it indicates that a stable state has been reached. Experiments have shown that SSL products are not stable in photometric and chromatic measurements. The stabilized initial value and stable value generally differ by 5-15% (see Table 1: Description of measured data), which brings great measurement uncertainty to the measurement. The integrating sphere currently used in the field of optical measurement of SSL lighting products The system does not detect and monitor the temperature distribution and changes in the space inside the integrating sphere. In this way, it is impossible to know when the SSL product reaches thermal stability; on the other hand, it is also impossible to obtain the distribution of the internal space distance of the integrating sphere from the initial test state to the stable state, and the functional relationship between the temperature step interval, time change and different acquisitions. The functional relationship of point temperature change, and these several functional relationships obtained by temperature measurement are very important and meaningful for SSL testing.

the

Table 1

Contents of the invention

In view of the defect that the above-mentioned existing technology cannot know when the SSL product reaches thermal stability, the present invention can obtain the distribution of the internal space distance of the integrating sphere and the temperature step interval by using a thermocouple to conduct photoelectric measurement and auxiliary monitoring of the SSL lighting product. The functional relationship can also obtain the functional relationship between the time change and the temperature change at different collection points, so that the thermal stability of the SSL product can be accurately monitored, the photometric value and chromaticity value of the SSL product can be measured, and the thermal performance of the SSL product can be analyzed and counted. relationship to actual life expectancy.

To achieve the above object, the present invention adopts the following technical solutions:

A method of using thermocouples to monitor the photoelectric measurement of SSL lighting products: comprising the following steps:

① Setting and calibration system for the initial measurement conditions of the integrating sphere test system;

② Put in SSL lighting products and test according to the conventional steps of photoelectric testing;

Wherein, during the process of performing the conventional photoelectric test on the SSL lighting product, the thermocouple is used to monitor the temperature of the SSL lighting product, and the photoelectric measurement is performed when the thermocouple monitoring system monitors that the temperature is stable.

Further, the photoelectric measurement includes photometric and chromatic measurement of the SSL lighting product.

The present invention also provides an integrating sphere measuring device utilizing a thermocouple to monitor temperature, including an integrating sphere used for photometric and chromaticity measurements, and a thermocouple probe for measuring the temperature at a preset position in the integrating sphere is arranged inside the integrating sphere .

Further, the thermocouple probe at the preset position includes a probe for measuring the temperature of the shell of the SSL lighting product and the temperature of the surrounding space of the SSL lighting product.

Preferably, the thermocouple probe for measuring the shell temperature of the SSL lighting product is substantially set at the center of the integrating sphere, leaving a certain length margin for the outgoing line, and pasting it on the shell surface of the SSL lighting product with aluminum platinum paper .

Preferably, a cross bar is set in the integrating sphere, and the thermocouple probes for measuring the temperature of the peripheral space of the SSL lighting product are evenly arranged on the cross bar from the center point to the edge.

Further, the thermocouple probes are all led from the cable port of the integrating sphere to the signal input end of the TMP-2 multi-point temperature inspection instrument outside the integrating sphere through thermocouple wires, and the 232 of the TMP-2 multi-point temperature inspection instrument The interface is connected with the computer, and the TMP-2 temperature measurement software of the computer is used to monitor the change curve of the temperature rise.

By adopting the above technical solutions, the present invention can achieve the following beneficial technical effects:

By setting up the thermocouple temperature control system, the temperature monitoring of the photoelectric test process of SSL lighting products in the integrating sphere can be realized, and the function relationship between the measurement results such as luminosity and chromaticity relative to the temperature can be established to effectively monitor the SSL lighting products. Perform structural and lifetime analysis.

the

Description of drawings

Figure 1 is a schematic diagram of an integrating sphere test system for photometric and chromaticity tests on SSL products;

Fig. 2 is the thermocouple schematic diagram of adding temperature detection to the integrating sphere test system in Fig. 1;

Fig. 3 is the curve diagram of the temperature stabilization of thermocouple probe;

Fig. 4 is the relationship diagram of temperature variation with time at different monitoring points;

Fig. 5 is the variation diagram of the temperature distribution with distance at different monitoring points;

Fig. 6 is the attenuation change relationship diagram of luminous flux with time;

Figure 7 shows the relationship between the decay rate and the temperature when it is stable.

In the figure: 1 integrating sphere, 2 SSL product, 3 standard lamp, 4 auxiliary lamp, 5 baffle, 6 detection port, 7 photometer test system, 8 thermocouple probe, 9 cross bar

Detailed ways

The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

As shown in Figure 1 and Figure 2, the present invention provides a device for accurate photoelectric measurement of SSL lighting products by using a thermocouple-assisted monitoring method, including a hollow integrating sphere 1, a standard lamp 3, an auxiliary lamp 4, and a baffle 5 , detection port 6, photometer test system 7, wherein, the inner wall surface of the housing of integrating sphere 1 is coated with non-wavelength selective (uniform) diffuse reflective white paint pure barium sulfate, in order to make the temperature uniform, the integral The shell of the ball 1 is made of metal iron with high thermal conductivity. The standard lamp 3 is used to calibrate the test system before the test. The auxiliary lamp 4 is turned on during calibration to correct the error of different shapes of sample lamps during calibration. The baffle plate 5. It can prevent the sample lamp from directly irradiating the photometric probe, so that it can be fully diffusely reflected in the integrating sphere. The detection port 6 is connected to the device of the photometric probe, and the photometer test system.

At the same time, a plurality of thermocouple probes 8 are evenly arranged on the inner cross bar 9 of the integrating sphere extending from the center point to the edge, wherein three thermocouple probes 8 are arranged at the center point to detect the surface of the outer shell of the SSL product 2 under test. Temperature, the radius crossbar is 1m long, and a thermocouple probe 8 is arranged every 10cm along the radius of the four crossbars 9 to the edge, so that a total of 36 thermocouple probes are used to measure the upper, lower, left, and right spaces inside the integrating sphere 1, etc. The temperature value of the distance distribution, so as to establish the functional relationship between the spatial distance distribution of the SSL product 2 as a heat source and the temperature step interval.

All the thermocouple probes 8 are led from the cable port of the integrating sphere 1 to the signal input terminal (Signal Input) of the TMP-2 multi-point temperature inspection instrument (not shown) outside the integrating sphere 1 through thermocouple wires, each The TMP-2 multi-point temperature inspection instrument has a total of 16 signal input terminals, and a total of 4 TMP-2 multi-point temperature inspection instruments are required to connect to the thermocouple wires drawn out. The multi-hoop thermocouple wires are fixed tightly on the cross bar 9 inside the integrating sphere 1 with a wire tape to ensure that the spacing is fixed accurately. The thermocouple probe 8 set at the center point has a certain length margin, and is pasted on the shell surface of SSL lighting products 2 of different sizes and shapes with aluminum platinum paper.

The 232 interface of the TMP-2 multi-point temperature inspection instrument is connected to the computer, and the TMP-2 temperature measurement software system software of the computer is used to monitor the change curve of the temperature rise, and the following relationship diagram can be obtained:

The relationship diagram of temperature at different monitoring points with time (Figure 4). Through this figure, the length of time for SSL lighting products with different structures and schemes to reach thermal equilibrium, as well as the temperature value at which thermal equilibrium is reached, can be used to stabilize the product. Accurate photometric, chromatic measurement and research on various performance indicators and life;

The relationship diagram of the temperature distribution of different monitoring points with the distance distribution (Figure 5), so as to obtain the spatial distribution of heat sources of different products;

The relationship diagram of the decay of luminous flux with time (Figure 6), so as to obtain the change and attenuation of the luminous flux of SSL lighting products from the initial value to the thermal stability, as well as the research on various performance indicators and life;

The relationship between the attenuation rate and the temperature when it is stable (Figure 7), so as to study the attenuation rate of the luminous flux of the product at different stable temperatures.

Figure 3 is the temperature stabilization curve of the thermocouple probe, which schematically illustrates the process of SSL products generally reaching thermal equilibrium.

The following takes a 6.8w bulb lamp (belonging to SSL lighting products) as an example to illustrate the significance of temperature monitoring for SSL products in the integrating sphere light and chromaticity test system. The initial and stable luminous flux of this 6.8w bulb lamp and the change of luminous flux after aging for 3000 hours are shown below.

Connect the sample lamp to AC 220V/50Hz, use the power supply APS-9102, AC power meter GPM-8212, and Lanfei Optical Integrating Sphere CDS 2100 to test the initial state and stabilized luminous flux respectively. The test steps are as follows: Calibrate the system, put in the SSL Lighting products are tested according to the conventional steps of photoelectric testing. When the temperature is stabilized by the thermocouple monitoring system, photoelectric measurement is performed. After the test, aging is performed to test the luminous flux maintenance rate and light attenuation rate, and the stable value of the two sample lamps There is a large difference, and the light decay after aging for 3000 hours is also relatively obvious, resulting in a relatively obvious difference in the predicted life, see Table 2 and Table 3.

sample initial value stable value Aging 3000 hours Decay rate (relatively stable) 1# sample light flux 492.6 468.2 428.3 8.52% 2# sample light flux 490.7 478.4 450.6 5.81%

Table 2.

the Sample lamp 1 Sample light 2 Define retention 70% 70% testing time 3000H 3000H light decay during 8.521% 5.810% Predicted life (hours) 12015 17876

table 3.

The temperature monitoring of the two sample lamps through the thermocouple probe found that the shell temperature differs greatly (as shown in Table 4), that is to say, the level of temperature affects the light decay and life of the product.

sample environment Shell test point A Enclosure test point B 1# sample lamp temperature (°C) 27.6 73.3 75.0 2# sample lamp temperature (°C) 28.1 55.3 57.4

Table 4.

Shell test point A and shell test point B in Table 4 are randomly selected sample points on the sample lamp shell.

The above Tables 2 to 4 show the parameters of luminosity such as luminous flux and light decay. As for the parameters of chromaticity, such as color temperature, color temperature drift rate and other parameters, the changes with temperature are not listed. Through the test experimental data, the same It can be seen that during the chromaticity test process, adding temperature monitoring has important guiding significance for the chromaticity test of SSL products, and can study the color drift of the product well, so as to control the color temperature and color rendering index of the product. Those skilled in the art can easily understand it according to the laws shown in Fig. 4 to Fig. 7 in the present invention and the combined test experiments, and will not be described in detail.

The above-mentioned embodiment is only a preferred implementation mode of the present invention. In addition, the present invention can also have other implementation modes. On the premise of not departing from the concept of the present invention, any obvious replacement, such as: for the thermocouple probe in the present invention The simple replacement and transformation of the location settings, quantity distribution, etc., all fall within the protection scope of the present invention. the

Claims (7)

1. A method for monitoring the photoelectric measurement of SSL lighting products by using thermocouples: comprising the following steps: ① Setting and calibration system for the initial measurement conditions of the integrating sphere test system; ② Put in SSL lighting products and test according to the conventional steps of photoelectric testing; It is characterized in that: during the photoelectric test of the SSL lighting product, the thermocouple is used to monitor the temperature of the SSL lighting product, and the photoelectric measurement is performed when the thermocouple monitoring system monitors that the temperature is stable. 2. The method of using thermocouples to monitor the photoelectric measurement of SSL lighting products according to claim 1, wherein the photoelectric measurement includes photometric and chromatic measurement of the SSL lighting products. 3. An integrating sphere measuring device utilizing a thermocouple to monitor temperature, comprising an integrating sphere (1) for photometric and chromaticity measurement, characterized in that: inside the integrating sphere is provided with Temperature thermocouple probe (8). 4. The integrating sphere measuring device utilizing thermocouples to monitor temperature according to claim 3, characterized in that: the thermocouple probe at the preset position includes a sensor for measuring the shell temperature of the SSL lighting product and the temperature of the SSL lighting product A probe for the temperature of the surrounding space. 5. The integrating sphere measuring device utilizing thermocouples to monitor temperature according to claim 4, characterized in that: the thermocouple probes for measuring the temperature of the shell of the SSL lighting product are substantially set at the center of the integrating sphere, and the outgoing wires are left There is a certain length margin, and the aluminum platinum paper is pasted on the shell surface of the SSL lighting product. 6. The integrating sphere measurement device using thermocouples to monitor temperature according to claim 4, characterized in that: a cross bar (9) is set in the integrating sphere (1), and the thermocouples for measuring the temperature of the peripheral space of SSL lighting products The probes (8) are evenly arranged on the cross bar (9) extending from the center point to the edge. 7. The integrating sphere measurement device using thermocouples to monitor temperature according to claim 5 or 6, characterized in that: the thermocouple probes (8) are all led from the cable port of the integrating sphere (1) to the Integrating sphere (1) The signal input terminal of the external TMP-2 multi-point temperature inspection instrument, the 232 interface of the TMP-2 multi-point temperature inspection instrument is connected to the computer, and the TMP-2 temperature measurement software of the computer is used to monitor the temperature rise change curve.

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