Selenium rectifier applications in automotive vehicles

1958 ◽  
Vol 76 (6) ◽  
pp. 369-371
Author(s):  
J. Emery Szabo
Keyword(s):  
Selenium Rectifier

Electrical Dispersion of Selenium Rectifier at High Frequency

1952 ◽  
Vol 7 (2) ◽  
pp. 171-173 ◽  
Author(s):  
Jiro Yamaguchi ◽  
Takeshi Miyauchi ◽  
Hideo Mori
Keyword(s):  
High Frequency ◽  
Selenium Rectifier

scholarly journals A Balance-by-Depth Method for the Photoelectric Measurement of the Vertical Extinction Coefficient of Water

1949 ◽  
Vol 28 (3) ◽  
pp. 751-755 ◽  
Author(s):  
W. R. G. Atkins ◽  
H. H. Poole ◽  
F. J. Warren
Keyword(s):  
Extinction Coefficient ◽  
New Method ◽  
Extinction Coefficients ◽  
Selenium Rectifier ◽  
Photoelectric Measurement ◽  
Successive Addition ◽  
Usual Formula

Vertical extinction coefficients can be determined in water using selenium rectifier cells and colour filters. The cells are connected positive to negative with a simple 0-50 microammeter across the circuit, as in the Campbell-Freeth method. There is no deflexion when the two points of contact are brought to the same potential. This is done by lowering one cell into the sea to balance the rather less sensitive deck cell. The light reaching the latter is then reduced by the successive addition of opalized plates, to approximately 60, 30, 20 and 10 %, and the sea cell is lowered further to balance at each stage. The extinctions can then be calculated by the usual formula from the known percentage transmissions and the observed depths of balance. For each plate or combination a factor may thus be obtained which when divided by the appropriate depth gives the extinction. The method is rapid in operation and the drift error can be rendered negligible. The results agree with those found by the standard potentiometer method, but the applications of the new method are necessarily more limited.

On the Blocking Layer of Selenium Rectifier (I)

1955 ◽  
Vol 10 (3) ◽  
pp. 233-234 ◽  
Author(s):  
Jiro Yamaguchi ◽  
Tadao Kanazawa ◽  
Toru Matozaki ◽  
Kazuji Hirai
Keyword(s):  
Blocking Layer ◽  
Selenium Rectifier

scholarly journals The Use of a Selenium Rectifier Photo-electric Cell for Submarine Photometry

1934 ◽  
Vol 19 (2) ◽  
pp. 727-736 ◽  
Author(s):  
H. H. Poole ◽  
W. K. G. Atkins
Keyword(s):  
Green Light ◽  
The Other ◽  
Absorption Coefficients ◽  
Selenium Rectifier ◽  
Low Resistance ◽  
Other Hand ◽  
High Potentials ◽  
The Mean

1. Measurements of the penetration of light of various colours into the sea were carried out by means of a selenium rectifier cell. The mean vertical absorption coefficients were: for blue, 0·177; green, 0·153; “white,” viz. no filter, 0·216; yellow, 0·243; red, 0·345. The results accord well with those obtained under similar conditions with emission cells and show that, for water a couple of miles offshore, green light penetrates best.2. The current was measured using the potentiometer-telephone method as for emission cells, but determining the drop in potential across a low resistance, 10,100, or 1000 ohms. The motion of the ship was too violent to permit of the use of any available galvanometer of adequate sensitivity.3. Rectifier cells are more convenient to use than emission cells, as the currents to be measured are much larger and the absence, of high potentials greatly simplifies all insulation problems. On the other hand the curvature of the illumination–current relation involves additional labour in standardizing and in calculating results.

Induced Alternating Current Used for Cathodic Protection of a Coated Pipe Line★

CORROSION ◽  
1956 ◽  
Vol 12 (1) ◽  
pp. 17-19 ◽  
Author(s):  
S. J. BELLASSAI
Keyword(s):  
Salt Marsh ◽  
Cathodic Protection ◽  
Alternating Current ◽  
Selenium Rectifier ◽  
Leak Location ◽  
The Earth ◽  
High Line ◽  
Pipe Line ◽  
Graphite Rods ◽  
Circuit Resistance

Abstract After making repairs on a leak on a coated line through a salt marsh and paralleling a high voltage high line, it was learned that although considerable gradients existed in the earth adjacent to the high line there was no correlation in the measured quantities. It had been considered that natural rectification of the induced AC voltage was occurring. After tests with coupons buried near the pipe line showed the pipeline was predominantly positive to earth at the leak location, a test ground bed was constructed to examine the feasibility of rectifying the induced alternating current. Measurement of the rectified voltage between the pipeline and the test ground bed through a 25-ampere, 18-volt selenium rectifier was 5 volts DC available for cathodic protection. A 5-ampere, 15-volt selenium stack, ten 3-inch x 60-inch graphite rods and 500 feet of 1/0 copper cable was calculated to provide circuit resistance of the required value to protect the line cathodically.

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