INFRAMET offers fourteen different types of standard targets for testing thermal cameras:

1. Four-bar targets 

2. Triangle targets

3. Pinhole targets

4. Square targets

5. Slit targets

6. Edge targets

7. Alignment  targets

8. Double 4-bar targets

9. Multiply 4-bar targets

10. Multiply pinhole targets

11. Abingdon cross targets

12. Distortion targets

13. Grey scale target

14. Silhouette targets

1)	2)	3	4)	5)	6)	7)

8)	9)	10)	11)	12)	13)	14)

 

Attention: Diameter of the active area (area covered with high emissivity coating) of standard Inframet targets is equal to 54 mm. Mechanical dimensions of the Inframet target plates are set to fit to counterbores in the standard MRW-8 rotary wheel. However, Inframet can manufacture targets plates that can  fit to rotary wheels (or blackbody target support plates) offered  by  any  manufacturer.

Spatial frequency of 4-bar targets is calculated using the formula

where n is the spatial frequency of the 4-bar target of bar width equals a when the target is used with IR collimator of focal length f’.

Angular size of triangle, circular targets, slit targets, and square targets is calculated as

where a is the angular size of the target of linear size d when the target is used with IR collimator of focal length f’.

4-BAR TARGETS

These targets (4-bar, 7:1 ratio, single pattern) are used to perform Minimum Resolvable Temperature Difference (MRTD) measurements.  A set of targets with various spatial frequencies is used to measure MRTD as a function of spatial frequency. Targets of different bars size (spatial frequency) are fixed to the rotary wheel.
 

Tab.1.   List of standard 4-bar targets  and spatial frequencies of 4-bar targets for different collimators

Attention: 4-bar targets of spatial frequencies  not included in the table  are available upon specific request. Minimal bar width is 0.05mm.

TRIANGLE TARGETS

Triangle target are needed for testing thermal imagers using TOD (Triangle Orientation Discrimination) method. TOD is an alternative to MRTD measurement or MDTD.  TOD method has a  number of theoretical and practical advantages over MRTD or MDTD. 

Tab.2. List of standard triangle  targets

diameter [mm]	angular size [mrad]
	CDT 750 collimator	CDT1000 collimator	CDT1000 collimator	CDT2000 collimator	CDT 2500 collimator
	f'=762 mm	f'=1143 mm	f'=1500 mm	f'=2000 mm	f'=2540 mm
20	26,25	17,50	13,33	10,00	7,92
10	13,12	8,75	6,67	5,00	3,96
5	6,56	4,37	3,33	2,50	1,98
2,5	3,28	2,19	1,67	1,25	0,99
1,25	1,64	1,09	0,83	0,63	0,50
1	1,31	0,87	0,67	0,50	0,40
0,75	0,98	0,66	0,50	0,38	0,30
0,5	0,66	0,44	0,33	0,25	0,20
0,25	0,33	0,22	0,17	0,13	0,10

Attention: Other sizes are available upon specific request.

PINHOLE TARGETS

Pinhole targets are needed  for measurement of  Minimum Detectable Temperature Difference  (MDTD) function, and during alignment or  and bore-sight process.  

Tab.3. List of standard pinhole (circular) targets

 

diameter [mm]	angular size [mrad]
	CDT 750 collimator	CDT1000 collimator	CDT1500 collimator	CDT2000 collimator	CDT 2500 collimator
	f'=762 mm	f'=1143 mm	f'=1500 mm	f'=2000 mm	f'=2540 mm
40	52,49	35	26,67	20,00	15,85
30	39,37	26,25	20,00	15,00	11,89
25,6	33,6	22,4	17,07	12,80	10,14
12,8	16,8	11,2	8,53	6,40	5,07
6,4	8,4	5,6	4,27	3,20	2,54
3,2	4,2	2,8	2,13	1,60	1,27
2	2,62	1,75	1,33	1,00	0,79
1,6	2,1	1,4	1,07	0,80	0,63
0,8	1,05	0,7	0,53	0,40	0,32
0,5	0,66	0,44	0,33	0,25	0,20
0,4	0,52	0,35	0,27	0,20	0,16
0,25	0,33	0,22	0,17	0,13	0,10
0,2	0,26	0,17	0,13	0,10	0,08
0,15	0,2	0,13	0,10	0,08	0,06
0,1	0,13	0,09	0,07	0,05	0,04

Attention: Other sizes are available upon specific request.

SQUARE TARGETS

Square targets (widow targets) are needed for measurements of Noise Equivalent Temperature Difference (NETD), Fixed Pattern Noise (FPN), Signal Transfer Function (SiTF), Aperiodic Transfer Function (ATF), Minimum Detectable Temperature (MDT). 

Tab.4. List of standard square targets

size [mm]	angular size [mrad]
	CDT 750 collimator	CDT1000 collimator	CDT1500 collimator	CDT1500 collimator	CDT 2500 collimator
	f'=762 mm	f'=1143 mm	f'=1500 mm	f'=2000 mm	f'=2540 mm
35	45,93	30,62	23,33	17,50	13,78
30	39,37	26,25	20,00	15,00	11,81
25,6	33,60	22,40	17,07	12,80	10,09
12,8	16,80	11,20	8,53	6,40	5,04
6,4	8,40	5,60	4,27	3,20	2,52
3,2	4,20	2,80	2,13	1,60	1,26
2	2,62	1,75	1,33	1,00	0,79
1,6	2,10	1,40	1,07	0,80	0,63

Attention: Other sizes are available upon specific request.

SLIT TARGETS

Slit targets are manufactured by cutting holes in shape of a rectangle of different width.  These target are needed during measurement of SRF (slit response function). Very narrow slits are useful also for  MTF (modulation transfer function) measurement.

Tab.3. Slit targets

slit width [mm]	angular size [mrad]
	CDT 750 collimator	CDT1000 collimator	CDT1500 collimator	CDT 2000 collimator f'=2000 mm	CDT 2500 collimator
	f'=762 mm	f'=1143 mm	f'=1500 mm		f'=2540 mm
20	26,25	17,5	13,33	10,00	7,87
15	19,69	13,12	10,00	7,50	5,91
10	13,12	8,75	6,67	5,00	3,94
7,5	9,84	6,56	5,00	3,75	2,95
6	7,87	5,25	4,00	3,00	2,36
5	6,56	4,37	3,33	2,50	1,97
3,5	4,59	3,06	2,33	1,75	1,38
3	3,94	2,62	2,00	1,50	1,18
2,5	3,28	2,19	1,67	1,25	0,98
2	2,62	1,75	1,33	1,00	0,79
1,5	1,97	1,31	1,00	0,75	0,59
1,3	1,71	1,14	0,87	0,65	0,51
1	1,31	0,87	0,67	0,50	0,39
0,8	1,05	0,7	0,53	0,40	0,31
0,75	0,98	0,66	0,50	0,38	0,3
0,56	0,73	0,49	0,37	0,28	0,22
0,5	0,66	0,44	0,33	0,25	0,2
0,4	0,52	0,35	0,27	0,20	0,16
0,35	0,46	0,31	0,23	0,18	0,14
0,28	0,37	0,24	0,19	0,14	0,11
0,2	0,26	0,17	0,13	0,10	0,08
0,14	0,18	0,12	0,09	0,07	0,06
0,1	0,13	0,09	0,07	0,05	0,04
0,05	0,075	0,045	0,03	0,03	0,02

Attention: Other sizes are available upon specific request.

EDGE TARGETS

Edge targets are useful for indirect measurement of Modulation Transfer Function (MTF) on the basis of measured directly Edge Spread Function (ESF).  The are manufactured by cutting a half-moon of sharp smooth edge.
Contact INFRAMET for further details.

ALIGNMENT  TARGETS

Alignment targets are useful for  boresighting, focusing and alignment applications.  The targets are manufactured by cutting  pinhole-and-cross combinations. Contact INFRAMET for further details.

DOUBLE 4-BAR TARGETS

These targets are useful when it is necessary to measure MRTD function for both vertical and horizontal orientation of the bars. It is possible to shorten significantly measurement time.  
Contact INFRAMET for further details.

MULTIPLE 4-BAR TARGETS

These targets are cost-effective solution for  MRTD measurements. A single multiply 4-bar target with several 4-bar patterns can replace a few  4-bar targets with a single pattern.

Attention: Application of these targets can decrease measurement accuracy. Please contact Inframet for recommendations.

MULTIPLY PINHOLE TARGETS

These targets are cost-effective solution for  MDTD measurements. A single multiply pinhole target with several pinhole patterns can replace a few  pinhole targets with a single pattern.

Attention: Application of these targets can decrease measurement accuracy. Please contact Inframet for recommendations.

ABINGDON CROSS TARGETS

These targets are used to evaluate the effectiveness of image processing algorithms in presence of noise.  Contact INFRAMET for further details.

DISTORTION TARGETS

These targets are used to evaluate distortion of the image generated by tested thermal imagers. Contact INFRAMET for further details.

GREY SCALE TARGETS

Gray scale targets are used to measure linearity and dynamic range of the tested thermal imagers in a single operation. Contact INFRAMET for further details.

SILHOUETTE TARGETS

Silhouette targets are used evaluation of recognition ranges of real targets with the tested thermal imager. Contact INFRAMET for further details.

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