Introduction

In this experiment, observation of gas in the infrared spectrum, we will be discussing the ability of the chemical composition of gas to affect the absorption and transmission of infrared radiation by concealing a light source with a visible transmitted gas.

Our experiment also includes the study of infrared light transmitted through gas.

Aim

To determine the effect of the chemical composition of gas on the transmission and absorption of infrared radiation.

Theory

To perform this experiment, we hypothesized that the composition of gas does affect infrared viewing.

Requirements

1. PVC pipes

2. Spectroradiometer

3. 8-12 micron infrared camera that has a digital imagery

4. Sulfur Hexafluoride

5. Carbon Dioxide

6. Tetrafluoroethane

7. Ammonia Isopropyl Alcohol

8. Acetone

9. Freon 13

10. Resmethrin

11. A can of air.

12. A blackbody

13. Notebook

Procedure

Step 1: Using the PVC pipe, construct a (5“ X 29 ½ “) gas cell.

Step 2: Connect this cell with a spectroradiometer that operates between 2.2 and 14.5 micrometers.

Step 3: Use a black body that would act as a constant heat source.

Step 4: Perform the testing with various gasses such as Sulfur HexaFluoride, TetraFluoroethane, Carbon dioxide, Ammonia, Acetone, Isopropyl Alcohol, Freon 13, a can of air, and Resmethrin.

Step 5: Use an 8 to 12-micron infrared camera to click photos before and during testing.

Step 6: Test the gasses in a controlled environment.

Step 7: Record your observations.

Observation

1. With the help of a wide-range SR5000 spectroradiometer, we were able to look at one micron at one time for each gas.

2. With the gathered information, we were able to proceed with the infrared imaging system on the same gasses to look visually for the concealing of the heat source.

Result

1. Our hypothesis, in which we assumed that the chemical composition affects the transmissivity in the infrared spectrum, is true.

2. We observed that the chemical composition of gas directly affects the transmissivity of the infrared spectrum.

3. Among all, the can of air had the higher area of absorption, which results in low transmission of infrared area. And this causes some to occur in the infrared spectrum.

Precaution

1. Wear gloves to perform this experiment.

2. Click pictures more often during experiments.

Conclusion

In this experiment, observation of gas in the infrared spectrum, we determined how the chemical composition of gas affects the absorption and transmission of infrared radiation.

VIVA Questions With Answers

Q.1 What was the aim of your experiment?

ANS. We aimed to determine the effect of the chemical composition of gas on the transmission and absorption of infrared radiation.

Q.2 Which material caused more obscuring in the infrared spectrum?

ANS. A can filled with air caused more obscuring in the infrared spectrum?

Q.3 Does the composition of gas affect its infrared viewing?

ANS. Yes, the composition of gas does affect its infrared viewing.

Saquib Siddiqui

Saquib Siddiqui is a Mechanical Engineer and a content creator. He has special interest in science experiments and teaches the same to school and college students. He is also a technical lead at RUDE LABS PVT. LTD.