JJF 1576-2016Program of pattern evaluation of infrared devices for instant screening of human skin temperature (English PDF)

7.2 Mode

7.2.1 The screening instrument shall have a body temperature mode and indicate the set display mode.

7.2.2 The calibration mode of the screening instrument shall be directly set or obtained through the conversion technique of body temperature mode.

7.3 Alert function

When the display of the screening instrument after measurement reaches or exceeds the alert temperature value, it shall be able to immediately emit alert such as lights, sounds or on-screen instructions.

7.4 Consistency of temperature measurement (applicable to

thermal imaging screening instrument)

The temperature measurement consistency of the screening instrument shall not exceed ± 0.2°C.

7.5 Environmental test requirements

7.5.1 Storage and transportation environment

The screening instrument is in a packaged state. It is respectively placed in an environmental test chamber -- temperature is -20°C, relative humidity is less than 50% -- for 7 d; and in an environmental test chamber -- temperature is

50°C, relative humidity is not less than 75%, no condensation -- for 7 d. At the end of each storage period and after returning to room temperature for 2 h, make measurement. The laboratory error of the screening instrument shall meet the requirements of 6.3.

7.5.2 Mechanical environment

The test conditions of the mechanical environment of the screening instrument shall meet the requirements of Table 1. After the test, the laboratory error of the screening instrument shall meet the requirements of 6.3.

9.1 Technical data requirements

The technical information submitted by the applicant shall meet the requirements of Chapter 4 of JJF 1015-2014.

9.2 Number of prototypes submitted

The applicant shall provide a test prototype which shall pass the exit-factory inspection.

For applications based on a single product, in general, the number of test prototypes is 3.

For applications based on a series of products, in general, randomly take 1/3 representative products from the series, meanwhile 3 prototypes are provided for each specification. The representative specifications shall be determined by the technical institution undertaking the test based on the technical documents provided by the applicant.

Generally, the product of different specifications with different optical paths, different types of main components or different technical indicators shall not be divided into the same series.

Under normal circumstances, the prototype will be sent by the applicant itself.

9.3 How to use the prototype

All test items shall be carried out on all prototypes. The prototype shall not be adjusted during the test or during the experiment.

10.1 Resolution test

- Test purposes

Check whether the test prototype meets the requirements of 6.1.

If all single measurement results of a single prototype are qualified, then, the temperature display range of the prototype is qualified; otherwise it is unqualified.

10.3 Laboratory error 1

At the environmental conditions of temperature 24°C ~ 26°C and relative humidity 40% ~ 65%, perform the laboratory error test.

- Test purposes

Check whether the test prototype meets the requirements of 6.3.

- Test conditions

It shall meet the temperature and humidity requirements of Table 2 of GB/T

19146-2010.

- Test equipment

It shall meet the requirements of 6.2.1 in JJF 1107-2003.

- Test procedure

Respectively set the standard blackbody radiation source’s temperature at the point of the screening instrument’s measuring range’s lower-limit +

0.7°C, 33.0°C, 35.6°C, 37.0°C, and the point of the screening instrument’s measuring range’s higher-limit - 0.7°C.

For each prototype, perform 4 consecutive measurements of the standard blackbody radiation source at each temperature point; the time interval between each measurement remains the same. Record the temperature value displayed by the screening instrument for each measurement.

- Data processing

For each prototype, a single measurement determines the laboratory error:

ei, j = ︱ti, j - tBBi︱, j = 1, 2, 3, 4, unit °C.

Where:

tBBi - Standard blackbody radiation source’s temperature;

ti, j - The jth temperature indication value when the standard blackbody’s temperature tBBi is measured by the screening instrument;

j indicates the order of readings.

period, the standard blackbody radiation source is continuously measured

4 times; the interval between each measurement shall be consistent.

Record the temperature value displayed by the screening instrument for each measurement.

- Data processing

Same as 10.3.

- Qualification criteria

If ei, j determined by single measurement of a single prototype meets the requirements of 6.3, then, the single measurement result is qualified;

otherwise, the single measurement result is unqualified.

If all single measurement results of a single prototype are qualified, then, the laboratory error measured by the prototype under the environmental conditions specified in this clause is qualified; otherwise, it is unqualified.

10.5 Test of alert response time

- Test purposes

Check whether the test prototype meets the requirements of 6.4.

- Test conditions

Environmental conditions: It shall meet the requirements of 6.1 in GB/T

19146-2010.

- Test equipment

It shall meet the requirements of 6.2.1 in JJF 1107-2003. Meanwhile it is equipped with a timer and a light blocking plate.

- Test procedure

Set the standard blackbody radiation source to be 0.5°C higher than the calibration mode value corresponding to the alert temperature point of the screening instrument. Place the light barrier between the standard blackbody radiation source and the screening instrument. Produce a temperature step (excitation) by quickly removing the light barrier. Observe the measurement of the standard blackbody radiation source’s temperature by the screening instrument. Use a stopwatch to directly record the alert response time tau. Each prototype is measured 4 times.

- Qualification criteria

10.7 Test of temperature measurement consistency

- Test purposes

Check whether the test prototype meets the requirements of 7.4. This test item is only applicable to the prototype of the thermal imaging screening instrument.

- Test conditions

Environmental conditions: It shall meet the requirements of 6.1 in GB/T

19146-2010.

- Test equipment

It shall meet the requirements of 6.2.1 in JJF 1107-2003.

- Test procedure

Follow the requirements and steps of 6.5.4 in GB/T 19146-2010. For each prototype, determine the consistency Phin of the temperature measurement results in different areas of the measurement field of view.

- Data processing

The consistency of temperature measurement is calculated by

Where:

Phin - Temperature measurement consistency, °C;

- The average value of temperature in the first area, °C;

- The average value of temperature in the nth area, °C. n = 2 ~ 5.

- Qualification criteria

If each prototype meets the requirements of 7.4, then, the consistency of temperature measurement is qualified; otherwise, it is unqualified.

10.8 Test for storage and transportation environment

- Test purposes

Environmental conditions: It shall meet the requirements of 6.1 in GB/T

19146-2010.

- Test equipment

It shall meet the requirements of 6.2.1 in JJF 1107-2003; meanwhile it is equipped with an impact test bench to meet the test requirements.

- Test procedure

Set the standard blackbody radiation source to the calibration mode value corresponding to the alert temperature point of the screening instrument.

Each prototype is installed on the impact test bench (the impact test bench executes the parameters in Table 1). After the impact test, the standard blackbody radiation source is continuously measured 4 times; the interval between each measurement remains the same; record the displayed temperature of the screening instrument for each measurement.

- Data processing

Same as 10.3.

- Qualification criteria

If ei, j determined by single measurement of a single prototype meets the requirements of 6.3, then, the single measurement result is qualified;

otherwise, the single measurement result is unqualified.

If all single measurement results of a single prototype are qualified, then, the impact test of the prototype is qualified; otherwise, it is unqualified.

10.10 Vibration test

- Test purposes

Check whether the test prototype meets the requirements of 7.5.2.

- Test conditions

Environmental conditions: It shall meet the requirements of 6.1 in GB/T

19146-2010.

- Test equipment

It shall meet the requirements of 6.2.1 in JJF 1107-2003. Meanwhile it is equipped with a vibration test bench that meets the test conditions.

measured 4 times; the interval between each measurement is kept the same; record the temperature value displayed by the screening instrument for each measurement.

- Data processing

Same as 10.3.

- Qualification criteria

If ei, j determined by single measurement of a single prototype meets the requirements of 6.3, then, the single measurement result is qualified;

otherwise, the single measurement result is unqualified.

If all single measurement results of a single prototype are qualified, then, the fall test of the prototype is qualified; otherwise, it is unqualified.

10.12 Electrical safety test

- Test purposes

Check whether the prototype meets the requirements of 7.5.3.

- Test conditions

It shall meet the requirements of 18 f) in GB 9706.1-2007.

- Test equipment

It shall meet the requirements of 18 f) in GB 9706.1-2007.

- Test procedure

It is performed according to 18 f) of GB 9706.1-2007.

- Qualification criteria

The measurement results of the prototype meet the requirements of 7.5.3, then the electrical safety test of the prototype is qualified; otherwise it is unqualified.

10.13 Electromagnetic compatibility test

- Test purposes

Check whether the test prototype meets the requirements of 7.5.4.

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