## Abstract

A submarine nephelometer has been built for use in measuring the volume scattering function of natural waters. Theory and construction details of the optical system are given, including pertinent data for the photodetector used. The instrument is capable of measuring volume scattering function between angles of 20° and 170° in typical coastal waters. Results of preliminary tests with the instrument are given.

© 1958 Optical Society of America

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### Equations (9)

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(1)
$$\sigma (\theta )=\frac{dJ(\theta )}{Hdv},$$
(2)
$$\text{Reading}=kRAH,$$
(3)
$$V={\int}_{{\chi}_{1}}^{{\chi}_{2}}{k}_{1}Adx,$$
(4)
$$\sigma (\theta )=\frac{dJ(\theta )}{Hdv},$$
(5)
$$J(\theta )=\frac{d{p}_{1}}{d\omega}=\frac{C{R}_{\theta}{e}^{\alpha {r}_{2}}}{d{A}_{1}/{{r}_{2}}^{2}}.$$
(6)
$$H=\frac{d{p}_{0}}{d{A}_{0}}=\frac{C{R}_{0}{e}^{-\alpha {r}_{1}}}{d{A}_{1}}\times \frac{d{A}_{2}}{d{A}_{0}},$$
(7)
$$\sigma (90\xb0)=\frac{{R}_{90}}{{R}_{0}}\xb7{e}^{\alpha ({r}_{1}+{r}_{2})}\left[\frac{{{r}_{2}}^{2}d{A}_{0}}{d{A}_{1}d{A}_{2}\chi}\right].$$
(8)
$$\frac{\sigma (90)}{{R}_{90}}\times {R}_{\theta}=\sigma (\theta ).$$
(9)
$$\sigma (\theta )={R}_{\theta}{e}^{\alpha ({r}_{1}+{r}_{2})}\left[\frac{{{r}_{2}}^{2}d{A}_{0}}{d{A}_{1}d{A}_{2}\chi {R}_{0}}\right].$$