1 / 16

Can we create measuring device using our observed properties of light?

Can we create measuring device using our observed properties of light?. What would we need to know to determine if our device was accurate?. How do we know our spring scales are accurate?. 1 kg. How do we know spring scales are accurate?. stretch (cm).  offset or “blank”. mass (kg).

corin
Download Presentation

Can we create measuring device using our observed properties of light?

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Can we create measuring device using our observed properties of light? What would we need to know to determine if our device was accurate?

  2. How do we know our spring scales are accurate? 1 kg

  3. How do we know spring scales are accurate? stretch (cm)  offset or “blank” mass (kg) 2 kg 1 kg 4 kg

  4. How do we know spring scales are accurate? stretch (cm) mass (kg) 2 kg 1 kg 1 kg 4 kg

  5. SI Units and time

  6. How do we know spring scales are accurate? stretch (cm) mass (kg) 2 kg 2 kg 1 kg 4 kg

  7. How do we know spring scales are accurate? stretch (cm) mass (kg) 2 kg 2 kg 1 kg 4 kg

  8. How do we know spring scales are accurate? stretch (cm) mass (kg) 2 kg 1 kg 4 kg

  9. How do we know spring scales are accurate? stretch (cm) mass (kg) 2 kg 1 kg 4 kg

  10. How do we know spring scales are accurate? stretch (cm) mass (kg) 2 kg 1 kg 4 kg

  11. How do we know spring scales are accurate? Calibration curve stretch (cm) mass (kg) Final calibration data What mass causes a stretch of 5.5 cm? =4.34 kg Stretch = mass (1.13) + 0.60 Mass = (stretch – 0.60) / 1.13 5.5 cm

  12. What would we need to know to make an accurate calibration curve for our device? light sensor Tank of milk and water

  13. Let’s look at milk fat globules in water + using serial dilutions

  14. Homogenized milk contains many small globules of fat 0.2 mm diameter FOV Why milk? Each mL of 2% milk contains about 10 million globules …this “population density” is about 1010 globules/L ten billion Which is the size of many exxtremophile microbes we’ll be looking for . About 10 m diameter glob is a big one Visible light is scattered nicely by these globules, about 5 m across on average

  15. The intensity of light that is transmitted decreases when the milk fat density. . . …what would our measurements be? (photoresistor voltage) What will the graph look like? (millions of globules per liter)

  16. Will the calibration curve be similar for a smaller device utilizing the same properties of light? • Insert picture & explanation of handheld spec here

More Related