APPARATUS FOR DETERMINING THE RADIATION SCATTERING PROPERTIES OF A FLUID(AND BY EX.)

• US 3,553,462 A
• Filed: 12/31/1969
• Issued: 01/05/1971
• Est. Priority Date: 12/31/1969
• Status: Expired due to Term

• Current Assignee: Dennis F. Johnson
• Original Assignee: Dennis F. Johnson
• Inventors: Johnson, Dennis F.
• Application Number:
  US04/889,159
• Time in Patent Office: 370 Days
• US Class Current: 250/565
• CPC Class Codes: G01N 21/532 with measurement of scattering and transmission

Abstract

Self-calibrating apparatus for determining the radiation scattering properties of a fluid. Radiation from a first source passes through the fluid in a first straight line path to a first radiation detector. Radiation from a second source passes through the fluid to a second radiation detector in a second straight line path intersecting the first path at the scattering angle of interest. The radiation detector outputs are combined to give the scattering coefficient.

Claims

2. Apparatus as claimed in claim 1 further comprising excitation source means connected to said first and second radiation sources for alternately energizing said first radiation source and said second radiation source.

3. Apparatus as claimed in claim 2 further comprising:

first amplification means coupling said first and second radiation detector to said circuit means and including first gain control means connected to said excitation source means for decreasing the gain of said first amplification means when said first radiation source is energized, and second amplification means coupling said second radiation detector to said circuit means and including second gain control means connected to said excitation source means for decreasing the gain of said second amplification means when said second source is energized.

4. Apparatus as claimed in claim 1 in which said circuit means includes means for generating the scattering coefficient S theta in accordance with S theta ((A21 A12)/(A11 A22)) 1/2 where A11 is the output from said first radiation detector due to radiation from said first radiation source, A22 is the output from said second radiation detector due to radiation from said second radiation source, A12 is the output from said first radiation detector due to radiation from said second radiation source, and A21 is the output from said second radiation detector due to radiation from said first radiation source.

5. Apparatus as claimed in claim 4 in which said circuit means includes a logarithmic circuit, means for sequentially applying to said logarithmic circuit the valves of A11, A21, A22 and A12 to generate the logarithms thereof, means for combining the logarithms for generating log S theta 1/2 ((log A21 + log A12) - (log A21 log A12)-(log A11 + log A22, and an antilogarithmic circuit connected to said last named means for generating from log S theta the value of S theta .

6. Apparatus as claimed in claim 5 in which said circuit means further comprises means for generating the time average value of S theta .