3.02

Using photodetection with a fixed axial line of sight

3.03

Using a source beam with a fixed axial direction or plane

3.09

Requiring scanning of a source beam

3.11

Using photodetection at the source station(s)

3.12

Using photodetection remote from the source station(s)

3.14

Using at least a pair of viewing axes

4.02

Of a simulation or test

4.03

Of focused image size or dimensions

4.04

Of degree of defocus

4.05

Of focal point search

4.06

Of differential amplitude at two source or detector distances

4.07

Of intensity proportional to distance

4.08

Of height relative to a light plane

4.09

Of light interference fringes

5.01

Of pulse transit time

5.09

Of frequency difference

5.1

Of CW phase delay

10

With filter or light valve

11

Range finder combined with height finder

12

Stereoscopic

15

Length of base line variable

16

Image displaced by moving refracting element

17

Image displaced by rotating reflecting element

18

With mounting, supporting, adjusting, or folding structure

19

Prism structure for determining coincidence

21

Object size or distance known

26

Vibrating or oscillating element

28.5

Of light interference (e.g., interferometer)

34

Attached detector

35

Sheet material

41

Oximeters

42

Standards

47

Automatic intensity control

48

Modulating (e.g., flicker beam)

49

Telescopic

56

With egg turning or jarring

58

Endless conveyor

59

Manual transfer

63

Hood type

65

With egg turning or jarring

66

With particular illumination means