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**Use chopper to measure ac instead of dc, claim order of magnitude better long-term stability from it. | **Use chopper to measure ac instead of dc, claim order of magnitude better long-term stability from it. | ||
**Much improvement from simultaneous reference and measurement beam. | **Much improvement from simultaneous reference and measurement beam. | ||
*[http://rsi.aip.org/resource/1/rsinak/v13/i5/p229_s1 A Turbidity Comparator] | |||
**Article from 1942; old aparatus, old electronics setup; not really useful. | |||
*[http://rsi.aip.org/resource/1/rsinak/v28/i2/p129_s1 Comparison Type Nephelometer] | |||
**Measure transmitted and scattered light with an integrating sphere each, and direct intensity, all three at once. | |||
**Polarized, old style (1952), not really useful. | |||
*[http://proceedings.aip.org/resource/2/apcpcs/914/1/419_1 Development of a Precise and in Situ Turbidity Measurement System] | |||
**Can't get the article so far. | |||
*[http://www.sciencedirect.com/science/article/pii/S0038092X0600291X Direct and indirect determination of the Linke turbidity coefficient] | |||
**Not relevant for us; it's about air turbidity. | |||
*[http://jcp.aip.org/resource/1/jcpsa6/v19/i6/p803_s3 Expressions for Turbidities] | |||
**Note how to compute turbidity with only tabulated functions. Irrelevant now we have computers. | |||
*[http://jcp.aip.org/resource/1/jcpsa6/v65/i7/p2913_s1 Inverted turbidity versus concentration dependence for aqueous polynucleotide–protein mixtures: Visible turbidity at low concentrations] | |||
**Not about measurement method. | |||
*[http://rsi.aip.org/resource/1/rsinak/v48/i5/p528_s1 LED marine beam transmittance meter] | |||
**Comparable to our stuff, but analog. | |||
**2% accuracy claimed. | |||
*[http://jcp.aip.org/resource/1/jcpsa6/v22/i1/p147_s1 Light Scattering Determination of the Absolute Turbidity of Water] | |||
** | |||
Revision as of 20:52, 4 June 2013
- A computercontrolled turbidity apparatus
- I_t = I_0e^{-(α+τ)l}
- We're looking for τ.
- Aparatus for measuring turbidity as function of temperature; includes oven to place sample in. Claims 0.001/mm accuracy and 0.5% precision.
- They measure transmitted light and assume no absorbtion; use a laser of polarized light with beam splitter.
- Use chopper to measure ac instead of dc, claim order of magnitude better long-term stability from it.
- Much improvement from simultaneous reference and measurement beam.
- A Turbidity Comparator
- Article from 1942; old aparatus, old electronics setup; not really useful.
- Comparison Type Nephelometer
- Measure transmitted and scattered light with an integrating sphere each, and direct intensity, all three at once.
- Polarized, old style (1952), not really useful.
- Development of a Precise and in Situ Turbidity Measurement System
- Can't get the article so far.
- Direct and indirect determination of the Linke turbidity coefficient
- Not relevant for us; it's about air turbidity.
- Expressions for Turbidities
- Note how to compute turbidity with only tabulated functions. Irrelevant now we have computers.
- Inverted turbidity versus concentration dependence for aqueous polynucleotide–protein mixtures: Visible turbidity at low concentrations
- Not about measurement method.
- LED marine beam transmittance meter
- Comparable to our stuff, but analog.
- 2% accuracy claimed.