YY 1081-2011Medical endoscopes—Endoscope supply units—Cold light sources (English PDF)

3.1 Light input surface of the optical fiber cable

Effective light-through surface at the connection terminal between the optical fiber cable and the cold light source.

3.2 Reference plane

The coincide plane between the light input surface of the optical fiber cable and the cold light source which is connected with adaptation cable.

4.1 Structure

The manufacturer shall provide the structure of cold light source in any viable form, including the characteristics of applicable bulb. And it shall clearly indicate if there is guided optical beam contained in the structure.

The product provided by manufacturer shall be consistent with the described structure.

4.2 Spectral properties

spectrums, it shall provide the distribution and matching ratio of the corresponding spectrums.

4.2.4 Spectral characteristics of cold light source of special spectrum use

For cold light source of special spectrum use, the manufacturer shall provide the spectral characteristics of cold light source, including the spectrum's main peak value, the nominal value and tolerance of FWHM (full width at half maximum). Cold light source shall comply with the spectral characteristics.

4.3 Illumination uniform performance of reference window

4.3.1 Illumination uniformity

The manufacturer shall provide the nominal value of illumination uniformity of reference window for cold light source used for rigid endoscope. the actual measured value shall not be greater than 1.05 times of the nominal value.

4.4 Radiation performance

4.4.1 Total output luminous flux

The manufacturer shall provide the nominal value of the total output luminous flux, tolerance of -10%, the upper limit does not count.

4.7 Safety measures of anti-fault

For cold light source used for surgery, it shall have safe measures of anti-fault, it may adopt methods such as providing indication of life-span of bulbs or providing indication of changing bulbs, or the use of spare bulbs.

5.1 Determination of CRI

5.1.2 The relative spectral power distribution S(lambda) of cold light source is obtained according to the measurement of 5.1.2, CALCULATE the ration of output radiation flux and luminous flux according to photometry principle.

5.1.1 Device

Spectroradiometer system. Spectral measurement range shall not be less than 380 nm - 780 nm, the wavelength resolution shall not be greater than 1.5.nm, the relative spectral radiance difference shall not be greater than 1%.

5.1.3 Calculation

It shall be carried out according to the provisions of GB/T 5702-2003 and GB/T 7922-2008.

5.2 Calculation of correlated color temperature

The relative spectral power distribution S(lambda) of cold light source is obtained according to the measurement of 5.1.2, CALCULATE color coordinates u, v according to GB/T 5702-2003, Then FIND the corresponding correlated color temperature according to blackbody radiation locus in uv chromaticity coordinates graph.

5.3 Calculation of radiation flux ratio of red, green and blue light

According to the correlated spectral power distribution S(lambda) of cold light source obtained from the measurement of 5.1.2, Phier, Phieg, Phieb shall be determined by formula (1), (2), (3) respectively.

5.6 Determination of illumination uniformity

5.6.1 Device

5.6.1.2 Positioning device

It shall be able to position the light input surface of standard single fiber for measurement, to ensure the light input surface to be located on the reference window of cold light source, and it can meet the positioning requirements of measurement positions selected on reference window.

5.6.2 Steps

5.6.2.1 Preparations

CONTROL the test environment, the dark intensity shall not be more than 1 lx.

CONTROL the power supply of light source to remain stable at the nominal voltage, the voltage shall be monitored, the voltage stability shall be controlled within ± 2%.

Light source shall be fully preheated, time shall not be less than 30 min.

The intensity setting of cold light source shall be adjusted to the maximum.

5.8.2.2 Measurement of luminous flux

USE positioning device to position the light input surface of standard single fiber onto the reference window of cold light source, and LET the center of light input surface to coincide with the center of reference window of cold light source; and center axis to be perpendicular to the plane of reference window.

5.9 Electrical safety performance test

It shall be conducted in accordance with the specified methods in GB 9706.1-2007 and GB 9706.19-2000.